{"id":2154,"date":"2025-08-13T17:13:07","date_gmt":"2025-08-13T09:13:07","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&#038;p=2154"},"modified":"2025-08-13T17:13:07","modified_gmt":"2025-08-13T09:13:07","slug":"what-is-a-type-2-surge-protection-device","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/sv\/blog\/what-is-a-type-2-surge-protection-device\/","title":{"rendered":"Vad \u00e4r en \u00f6versp\u00e4nningsskyddsenhet av typ 2?"},"content":{"rendered":"<h2 data-start=\"226\" data-end=\"241\">Introduktion<\/h2>\r\n<p data-start=\"243\" data-end=\"597\">A <a href=\"https:\/\/www.britecelectric.com\/sv\/product-category\/ac-power-surge-protection\/type-2-surge-protective-device\/\"><strong data-start=\"245\" data-end=\"279\">\u00d6versp\u00e4nningsskydd typ 2<\/strong><\/a> (Typ 2 SPD) \u00e4r ryggraden i \u00f6versp\u00e4nningsskydd i moderna elektriska system. Den \u00e4r installerad p\u00e5 huvudf\u00f6rdelningskortet eller styrsk\u00e5pet och fungerar som den andra sk\u00f6lden i en skiktad f\u00f6rsvarsstrategi \u2013 f\u00e5ngar upp \u00e5terst\u00e5ende \u00f6versp\u00e4nningar som l\u00e4mnats av uppstr\u00f6ms typ 1 SPD och undertrycker transienter som genereras inuti n\u00e4tverket.<\/p>\r\n<p data-start=\"599\" data-end=\"986\">Dessa enheter skyddar mot 8\/20 \u03bcs impulsstr\u00f6mmar som uppst\u00e5r fr\u00e5n blixtinducerade \u00f6versp\u00e4nningar, v\u00e4xlingsh\u00e4ndelser eller n\u00e4tst\u00f6rningar.<\/p>\r\nF\u00f6r att s\u00e4kerst\u00e4lla tillf\u00f6rlitligt, l\u00e5ngsiktigt skydd m\u00e5ste ingenj\u00f6rer och tekniska k\u00f6pare f\u00f6rst\u00e5 flera nyckelaspekter av en typ 2 SPD:\r\n<ul>\r\n \t<li><b>Definition:<\/b> vad \u00e4r det?<\/li>\r\n \t<li><b>Hur det fungerar:<\/b> Dess funktionsprinciper.<\/li>\r\n \t<li><b>Standarder:<\/b> Vilka regler uppfyller den?<\/li>\r\n \t<li><b>Installation och val:<\/b> Reglerna f\u00f6r att v\u00e4lja och installera det korrekt.<\/li>\r\n<\/ul>\r\n<h2 data-start=\"993\" data-end=\"1042\">Definition av en \u00f6versp\u00e4nningsskyddsenhet av typ 2<\/h2>\r\n<p data-start=\"1044\" data-end=\"1268\">Enligt <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\" target=\"_blank\" rel=\"noopener\"><em><strong>IEC\/EN 61643-11 standard<\/strong><\/em><\/a>, en **Typ 2 SPD** \u00e4r en klass II-enhet. Den \u00e4r designad f\u00f6r platser som inte har direkta blixtnedslag. Dessa platser l\u00f6per dock fortfarande risk f\u00f6r kraftiga transienta \u00f6versp\u00e4nningar.<\/p>\r\n<p data-start=\"1270\" data-end=\"1290\">Nyckelegenskaper:<\/p>\r\n\r\n<ul data-start=\"1291\" data-end=\"1618\">\r\n \t<li data-start=\"1291\" data-end=\"1335\">\r\n<p data-start=\"1293\" data-end=\"1335\">Testad med 8\/20 \u03bcs str\u00f6mv\u00e5gformer.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1336\" data-end=\"1466\">\r\n<p data-start=\"1338\" data-end=\"1466\">Typisk nominell urladdningsstr\u00f6m (In) \u00e4r mellan 5\u201320 kA, med maximal urladdningsstr\u00f6m (Imax) upp till 40\u201380 kA.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1467\" data-end=\"1530\">\r\n<p data-start=\"1469\" data-end=\"1530\">Monteras p\u00e5 lastsidan av elservicepanelen.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1531\" data-end=\"1618\">\r\n<p data-start=\"1533\" data-end=\"1618\">Skyddar mot b\u00e5de externa \u00f6versp\u00e4nningar och interna kopplingsst\u00f6tar.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"1620\" data-end=\"1802\">I praktisk till\u00e4mpning sitter en typ 2 SPD efter en typ 1-enhet och f\u00f6re eventuellt nedstr\u00f6ms typ 3-punktsskydd, och utg\u00f6r en del av ett flerstegs \u00f6versp\u00e4nningsskydd.<\/p>\r\n<p data-start=\"1620\" data-end=\"1802\"><a href=\"https:\/\/www.britecelectric.com\/sv\/product-category\/ac-power-surge-protection\/type-2-surge-protective-device\/\" target=\"_blank\" rel=\"noopener\"><img class=\"alignnone  wp-image-2160\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/08\/BR-20-4P-1Type-2-Surge-Protection-Device.jpg-1024x1024.webp\" alt=\"\" width=\"900\" height=\"900\" \/><\/a><\/p>\r\n\r\n<h2 data-start=\"1809\" data-end=\"1859\">Hur fungerar a <a href=\"https:\/\/www.britecelectric.com\/sv\/product-category\/ac-power-surge-protection\/type-2-surge-protective-device\/\" target=\"_blank\" rel=\"noopener\">\u00d6versp\u00e4nningsskydd typ 2<\/a> arbete?<\/h2>\r\n<p data-start=\"1861\" data-end=\"2143\">En typ 2 SPD arbetar enligt sp\u00e4nningskl\u00e4mningsprincipen. Vid normal sp\u00e4nning f\u00f6rblir den passiv. N\u00e4r en transient \u00f6versp\u00e4nning \u00f6verskrider dess maximala kontinuerliga driftsp\u00e4nning (Uc), v\u00e4xlar dess interna komponenter snabbt till ett ledande tillst\u00e5nd, vilket leder \u00f6verskottsenergi till jord.<\/p>\r\n<p data-start=\"2145\" data-end=\"2176\"><strong data-start=\"2145\" data-end=\"2176\">Typiska komponenter inkluderar:<\/strong><\/p>\r\n\r\n<ul data-start=\"2177\" data-end=\"2557\">\r\n \t<li data-start=\"2177\" data-end=\"2285\">\r\n<p data-start=\"2179\" data-end=\"2285\"><strong data-start=\"2179\" data-end=\"2210\">MOV (Metal Oxide Varistor):<\/strong> Det prim\u00e4ra kl\u00e4melementet, absorberar \u00f6versp\u00e4nningsenergi och minskar sp\u00e4nningen.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2286\" data-end=\"2385\">\r\n<p data-start=\"2288\" data-end=\"2385\"><strong data-start=\"2288\" data-end=\"2320\">Hybridkretsar (MOV + GDT):<\/strong> Kombinera h\u00f6g \u00f6versp\u00e4nningskapacitet med f\u00f6rb\u00e4ttrad l\u00e5ngsiktig tillf\u00f6rlitlighet.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2386\" data-end=\"2470\">\r\n<p data-start=\"2388\" data-end=\"2470\"><strong data-start=\"2388\" data-end=\"2418\">Termiskt fr\u00e5nkopplingssystem:<\/strong> Isolerar SPD vid slutet av sin livsl\u00e4ngd f\u00f6r att uppr\u00e4tth\u00e5lla s\u00e4kerheten.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2471\" data-end=\"2557\">\r\n<p data-start=\"2473\" data-end=\"2557\"><strong data-start=\"2473\" data-end=\"2494\">Statusindikator:<\/strong> Visuellt f\u00f6nster eller kontaktutg\u00e5ng f\u00f6r att visa drifttillst\u00e5nd.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"2559\" data-end=\"2582\"><strong data-start=\"2559\" data-end=\"2582\">Operationssekvens:<\/strong><\/p>\r\n\r\n<ol data-start=\"2583\" data-end=\"2882\">\r\n \t<li data-start=\"2583\" data-end=\"2645\">\r\n<p data-start=\"2586\" data-end=\"2645\"><strong data-start=\"2586\" data-end=\"2602\">Normall\u00e4ge:<\/strong> H\u00f6gt motst\u00e5nd, ingen p\u00e5verkan p\u00e5 kretsen.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2646\" data-end=\"2699\">\r\n<p data-start=\"2649\" data-end=\"2699\"><strong data-start=\"2649\" data-end=\"2665\">\u00d6versp\u00e4nningsh\u00e4ndelse:<\/strong> Sp\u00e4nningen stiger \u00f6ver Uc-tr\u00f6skeln.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2700\" data-end=\"2819\">\r\n<p data-start=\"2703\" data-end=\"2819\"><strong data-start=\"2703\" data-end=\"2716\">Fastsp\u00e4nning:<\/strong> SPD avleder \u00f6versp\u00e4nningsstr\u00f6m till jord och s\u00e4nker sp\u00e4nningen till en s\u00e4ker upp (sp\u00e4nningsskyddsniv\u00e5).<\/p>\r\n<\/li>\r\n \t<li data-start=\"2820\" data-end=\"2882\">\r\n<p data-start=\"2823\" data-end=\"2882\"><strong data-start=\"2823\" data-end=\"2836\">\u00c5terh\u00e4mtning:<\/strong> SPD \u00e5terg\u00e5r till standbyl\u00e4ge med h\u00f6gt motst\u00e5nd.<\/p>\r\n<\/li>\r\n<\/ol>\r\n<h2 data-start=\"2889\" data-end=\"2940\">Funktionen hos en \u00f6versp\u00e4nningsskyddsenhet av typ 2<\/h2>\r\n<p data-start=\"2942\" data-end=\"3106\">Den prim\u00e4ra rollen f\u00f6r en \u00f6versp\u00e4nningsskyddsanordning typ 2 \u00e4r att begr\u00e4nsa transienta \u00f6versp\u00e4nningar till en niv\u00e5 som nedstr\u00f6ms utrustning kan motst\u00e5 utan skador.<\/p>\r\n<p data-start=\"3108\" data-end=\"3122\">Nyckelfunktioner:<\/p>\r\n\r\n<ul data-start=\"3123\" data-end=\"3659\">\r\n \t<li data-start=\"3123\" data-end=\"3228\">\r\n<p data-start=\"3125\" data-end=\"3228\"><strong data-start=\"3125\" data-end=\"3154\">Resterande \u00f6versp\u00e4nningsbegr\u00e4nsning<\/strong> \u2014 minskar sp\u00e4nningen efter att en typ 1 SPD har absorberat huvuddelen av energin.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3229\" data-end=\"3356\">\r\n<p data-start=\"3231\" data-end=\"3356\"><strong data-start=\"3231\" data-end=\"3262\">V\u00e4xlings\u00f6versp\u00e4nningsd\u00e4mpning<\/strong> \u2014 d\u00e4mpar transienter fr\u00e5n motorstarter, pumpv\u00e4xling eller andra induktiva belastningsoperationer.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3357\" data-end=\"3471\">\r\n<p data-start=\"3359\" data-end=\"3471\"><strong data-start=\"3359\" data-end=\"3383\">Utrustningsskydd<\/strong> \u2014 f\u00f6rhindrar skador p\u00e5 k\u00e4nslig elektronik, PLC:er, automationssystem och driftdon.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3472\" data-end=\"3544\">\r\n<p data-start=\"3474\" data-end=\"3544\"><strong data-start=\"3474\" data-end=\"3496\">Systemtillf\u00f6rlitlighet<\/strong> \u2014 minskar stillest\u00e5ndstid fr\u00e5n \u00f6versp\u00e4nningsrelaterade fel.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3545\" data-end=\"3659\">\r\n<p data-start=\"3547\" data-end=\"3659\"><strong data-start=\"3547\" data-end=\"3568\">Del av en kaskad<\/strong> \u2014 sitter mellan serviceing\u00e5ngsskyddet (Typ 1) och punkt-of-use enheter (Typ 3).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2 data-start=\"3666\" data-end=\"3716\">Till\u00e4mpningar av \u00f6versp\u00e4nningsskyddsanordningar av typ 2<\/h2>\r\n<a href=\"https:\/\/www.britecelectric.com\/sv\/attachment\/spd-install\/\" rel=\"attachment wp-att-2159\"><img class=\"alignnone size-full wp-image-2159\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/08\/SPD-install.jpg\" alt=\"\" width=\"745\" height=\"609\" \/><\/a>\r\n<p data-start=\"3718\" data-end=\"3747\">Typ 2 SPD:er \u00e4r installerade i:<\/p>\r\n\r\n<ul data-start=\"3748\" data-end=\"4151\">\r\n \t<li data-start=\"3748\" data-end=\"3810\">\r\n<p data-start=\"3750\" data-end=\"3810\">Industrianl\u00e4ggningar med \u00e5skskyddssystem.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3811\" data-end=\"3891\">\r\n<p data-start=\"3813\" data-end=\"3891\">Kommersiella byggnader f\u00f6r att skydda VVS, hissar, belysning och IT-system.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3892\" data-end=\"3949\">\r\n<p data-start=\"3894\" data-end=\"3949\">Maskinstyrningssk\u00e5p f\u00f6r industriell automation.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3950\" data-end=\"4034\">\r\n<p data-start=\"3952\" data-end=\"4034\">F\u00f6rnybara energisystem \u2013 s\u00e5som solcells-PV-v\u00e4xelriktare och vindkraftskontroller \u2013 kr\u00e4ver robusta <a href=\"https:\/\/www.britecelectric.com\/sv\/product_category\/pv-surge-protection-type-2\/\" target=\"_blank\" rel=\"noopener\">\u00f6versp\u00e4nningsskydd<\/a> (se v\u00e5r <strong><em><a class=\"\" href=\"https:\/\/www.britecelectric.com\/sv\/blog\/solar-surge-protection-devices-selection-guide\/\" target=\"_blank\" rel=\"noopener\" data-start=\"201\" data-end=\"334\">Val av solskyddsanordningar<\/a><\/em><\/strong> och <strong><em><a class=\"\" href=\"https:\/\/www.britecelectric.com\/sv\/blog\/surge-protection-for-solar-photovoltaic-systems\/\" target=\"_blank\" rel=\"noopener\" data-start=\"339\" data-end=\"474\">\u00d6versp\u00e4nningsskydd f\u00f6r solcellsanl\u00e4ggningar<\/a><\/em><\/strong>).<\/p>\r\n<\/li>\r\n \t<li data-start=\"4035\" data-end=\"4093\">\r\n<p data-start=\"4037\" data-end=\"4093\">Sjukhus och datacenter d\u00e4r drifttiden \u00e4r avg\u00f6rande.<\/p>\r\n<\/li>\r\n \t<li data-start=\"4094\" data-end=\"4151\">\r\n<p data-start=\"4096\" data-end=\"4151\">Huvudpaneler f\u00f6r bost\u00e4der f\u00f6r skydd av hela huset.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2 data-start=\"262\" data-end=\"316\">\u00d6versp\u00e4nningsskydd av typ 1, typ 2 och typ 3<\/h2>\r\n<p data-start=\"318\" data-end=\"648\">\u00d6versp\u00e4nningsskydd har tre huvudtyper. Varje typ har olika jobb i elsystemet. Du kan l\u00e4sa mer i v\u00e5r detaljerade guide h\u00e4r: <em><strong><a class=\"\" href=\"https:\/\/www.britecelectric.com\/sv\/blog\/difference-between-type-1-type-2-and-type-3-surge-protective-devices\/\" target=\"_blank\" rel=\"noopener\" data-start=\"468\" data-end=\"647\">Skillnaden mellan \u00f6versp\u00e4nningsskydd av typ 1, typ 2 och typ 3<\/a>.<\/strong><\/em><\/p>\r\n\r\n<table style=\"width: 60.5183%;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\"><strong><b>S\u00e4rdrag<\/b><\/strong><\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\"><strong><b>Typ 1 SPD<\/b><\/strong><\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\"><strong><b>Typ 2 SPD<\/b><\/strong><\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\"><strong><b>Typ 3 SPD<\/b><\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\">Plats<\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\">Monteras vid serviceing\u00e5ngen.<\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\">Installerad vid huvudf\u00f6rdelningscentralen.<\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\">Installeras n\u00e4ra k\u00e4nsliga laster.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\">Testa v\u00e5gformen<\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\">Testad med 10\/350 \u03bcs blixtimpuls.<\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\">Testad med 8\/20 \u03bcs \u00f6versp\u00e4nningsstr\u00f6m.<\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\">Testad med 1,2\/50 \u03bcs sp\u00e4nning + 8\/20 \u03bcs str\u00f6m.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\">\u00c4ndam\u00e5l<\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\">Laddar ur blixtstr\u00f6m.<\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\">Begr\u00e4nsar kvarvarande \u00f6versp\u00e4nningar och v\u00e4xlingssp\u00e4nningar.<\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\">Ger slutligt skydd f\u00f6r elektronik.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\">Typiskt upp<\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\">\u2264 4 kV.<\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\">\u2264 2,5 kV.<\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\">\u2264 1,5 kV.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\">Exempel<\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\">Byggnader med \u00e5skskyddssystem (LPS).<\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\">Kontrollpaneler och underf\u00f6rdelningstavlor.<\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\">IT-utrustning och hemelektronik.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<p data-start=\"1409\" data-end=\"1423\"><strong data-start=\"1409\" data-end=\"1421\">Sammanfattning:<\/strong><\/p>\r\n\r\n<ul data-start=\"1424\" data-end=\"1706\">\r\n \t<li data-start=\"1424\" data-end=\"1494\">\r\n<p data-start=\"1426\" data-end=\"1494\"><strong data-start=\"1426\" data-end=\"1440\">Typ 1 SPD<\/strong> stoppar det mesta av h\u00f6genergiv\u00e5gen fr\u00e5n blixten.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1495\" data-end=\"1610\">\r\n<p data-start=\"1497\" data-end=\"1610\"><strong data-start=\"1497\" data-end=\"1511\">Typ 2 SPD<\/strong> \u00e4r mittf\u00f6rsvarslinjen. Den minskar \u00e5terst\u00e5ende \u00f6versp\u00e4nning och kontrollerar v\u00e4xlingssp\u00e4nningar.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1611\" data-end=\"1706\">\r\n<p data-start=\"1613\" data-end=\"1706\"><strong data-start=\"1613\" data-end=\"1627\">Typ 3 SPD<\/strong> \u00e4r det sista steget. Den skyddar k\u00e4nslig elektronik fr\u00e5n sm\u00e5, snabba \u00f6versp\u00e4nningar.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2 data-start=\"4715\" data-end=\"4766\">Hur v\u00e4ljer man r\u00e4tt \u00f6versp\u00e4nningsskydd?<\/h2>\r\n<p data-start=\"4768\" data-end=\"4922\">N\u00e4r man v\u00e4ljer den b\u00e4sta \u00f6versp\u00e4nningsskyddsanordningen av typ 2 b\u00f6r valet baseras p\u00e5 systemkompatibilitet, \u00f6versp\u00e4nningsriskniv\u00e5 och utrustningens k\u00e4nslighet.<\/p>\r\n<p data-start=\"4924\" data-end=\"5057\"><strong data-start=\"4924\" data-end=\"4976\">1. Matcha systemsp\u00e4nningen och jordningsarrangemanget<\/strong><br data-start=\"4976\" data-end=\"4979\" \/>Olika system \u2013 TT, TN-S, TN-C, IT \u2013 kr\u00e4ver olika SPD-konfigurationer:<\/p>\r\n\r\n<ul data-start=\"5058\" data-end=\"5212\">\r\n \t<li data-start=\"5058\" data-end=\"5104\">\r\n<p data-start=\"5060\" data-end=\"5104\"><strong data-start=\"5060\" data-end=\"5066\">4P<\/strong> (allpoligt skydd) f\u00f6r TN-system.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5105\" data-end=\"5212\">\r\n<p data-start=\"5107\" data-end=\"5212\"><strong data-start=\"5107\" data-end=\"5114\">3+1<\/strong> konfiguration (L-N-skydd plus N-PE-modul) f\u00f6r TT-system f\u00f6r att hantera N-PE-\u00f6versp\u00e4nningsh\u00e4ndelser.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"5214\" data-end=\"5404\"><strong data-start=\"5214\" data-end=\"5272\">2. Best\u00e4m Uc (maximal kontinuerlig driftsp\u00e4nning)<\/strong><br data-start=\"5272\" data-end=\"5275\" \/>Uc b\u00f6r vara n\u00e5got \u00f6ver den nominella systemsp\u00e4nningen f\u00f6r att f\u00f6rhindra on\u00f6dig triggning men tillr\u00e4ckligt l\u00e5g f\u00f6r effektivt skydd.<\/p>\r\n<p data-start=\"5406\" data-end=\"5449\"><strong data-start=\"5406\" data-end=\"5447\">3. Kontrollera urladdningsstr\u00f6mkapaciteten<\/strong><\/p>\r\n\r\n<ul data-start=\"5450\" data-end=\"5570\">\r\n \t<li data-start=\"5450\" data-end=\"5496\">\r\n<p data-start=\"5452\" data-end=\"5496\"><strong data-start=\"5452\" data-end=\"5487\">Nominell urladdningsstr\u00f6m (In):<\/strong> 5\u201320 kA.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5497\" data-end=\"5570\">\r\n<p data-start=\"5499\" data-end=\"5570\"><strong data-start=\"5499\" data-end=\"5536\">Maximal urladdningsstr\u00f6m (Imax):<\/strong> 20\u201380 kA beroende p\u00e5 riskniv\u00e5.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"5572\" data-end=\"5721\"><strong data-start=\"5572\" data-end=\"5608\">4. Sp\u00e4nningsskyddsniv\u00e5 (upp)<\/strong><br data-start=\"5608\" data-end=\"5611\" \/>L\u00e4gre upp betyder b\u00e4ttre skydd \u2014 sikta p\u00e5 \u2264 2,5 kV f\u00f6r allm\u00e4n utrustning, \u2264 1,5 kV f\u00f6r k\u00e4nslig elektronik.<\/p>\r\n<p data-start=\"5723\" data-end=\"5862\"><strong data-start=\"5723\" data-end=\"5767\">5. Tillf\u00e4llig \u00f6versp\u00e4nning (TOV) t\u00e5l<\/strong><br data-start=\"5767\" data-end=\"5770\" \/>Se till att SPD:n kan \u00f6verleva tillf\u00e4lliga \u00f6versp\u00e4nningsf\u00f6rh\u00e5llanden fr\u00e5n fel eller omkopplingsh\u00e4ndelser.<\/p>\r\n<p data-start=\"5864\" data-end=\"5892\"><strong data-start=\"5864\" data-end=\"5890\">6. Ytterligare funktioner<\/strong><\/p>\r\n\r\n<ul data-start=\"5893\" data-end=\"6019\">\r\n \t<li data-start=\"5893\" data-end=\"5935\">\r\n<p data-start=\"5895\" data-end=\"5935\">Pluggbara moduler f\u00f6r snabbt underh\u00e5ll.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5936\" data-end=\"5975\">\r\n<p data-start=\"5938\" data-end=\"5975\">Fj\u00e4rrlarmkontakter f\u00f6r \u00f6vervakning.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5976\" data-end=\"6019\">\r\n<p data-start=\"5978\" data-end=\"6019\">Termisk fr\u00e5nkoppling och visuella indikatorer.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2 data-start=\"6026\" data-end=\"6076\">Hur man installerar ett \u00f6versp\u00e4nningsskydd av typ 2<\/h2>\r\n<a href=\"https:\/\/www.britecelectric.com\/sv\/attachment\/type-2-spd-install\/\" rel=\"attachment wp-att-2158\"><img class=\"alignnone size-full wp-image-2158\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/08\/Type-2-SPD-install.jpg\" alt=\"\" width=\"732\" height=\"615\" \/><\/a>\r\n<p data-start=\"6078\" data-end=\"6144\"><strong data-start=\"6078\" data-end=\"6144\">B\u00e4sta installationsmetoder fr\u00e5n f\u00e4ltteknisk erfarenhet:<\/strong><\/p>\r\n\r\n<ol data-start=\"6145\" data-end=\"7145\">\r\n \t<li data-start=\"6145\" data-end=\"6266\">\r\n<p data-start=\"6148\" data-end=\"6266\"><strong data-start=\"6148\" data-end=\"6160\">Plats<\/strong> \u2014 Montera s\u00e5 n\u00e4ra som m\u00f6jligt till huvudf\u00f6rdelningsskivans samlingsskenor eller den utrustning du vill skydda.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6267\" data-end=\"6362\">\r\n<p data-start=\"6270\" data-end=\"6362\"><strong data-start=\"6270\" data-end=\"6293\">Parallellkoppling<\/strong> \u2014 Typ 2 SPD:er \u00e4r vanligtvis anslutna parallellt med str\u00f6mf\u00f6rs\u00f6rjningen.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6363\" data-end=\"6506\">\r\n<p data-start=\"6366\" data-end=\"6506\"><strong data-start=\"6366\" data-end=\"6381\">Blyl\u00e4ngd<\/strong> \u2014 H\u00e5ll den kombinerade l\u00e4ngden av fas-, noll- och jordledare under 0,5 m f\u00f6r att undvika att skyddssp\u00e4nningen h\u00f6js.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6507\" data-end=\"6619\">\r\n<p data-start=\"6510\" data-end=\"6619\"><strong data-start=\"6510\" data-end=\"6537\">Ledartv\u00e4rsnitt<\/strong> \u2014 Minst 6 mm\u00b2 koppar f\u00f6r typ 2; st\u00f6rre storlekar f\u00f6r enheter med h\u00f6gre kapacitet.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6620\" data-end=\"6716\">\r\n<p data-start=\"6623\" data-end=\"6716\"><strong data-start=\"6623\" data-end=\"6635\">Jordning<\/strong> \u2014 Anslut direkt till den huvudsakliga potentialutj\u00e4mningsst\u00e5ngen med den kortaste v\u00e4gen.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6717\" data-end=\"6840\">\r\n<p data-start=\"6720\" data-end=\"6840\"><strong data-start=\"6720\" data-end=\"6746\">\u00d6verstr\u00f6msskydd<\/strong> \u2014 Use fuses or circuit breakers sized according to the SPD's maximum short-circuit withstand.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6841\" data-end=\"7028\">\r\n<p data-start=\"6844\" data-end=\"7028\"><strong data-start=\"6844\" data-end=\"6880\">Koordinering i kaskadsystem<\/strong> \u2014 Om den installeras nedstr\u00f6ms om en SPD av typ 1, h\u00e5ll ett separationsavst\u00e5nd (&gt;10 m) eller installera en fr\u00e5nkopplingsspolning f\u00f6r att s\u00e4kerst\u00e4lla korrekt energidelning.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7029\" data-end=\"7145\">\r\n<p data-start=\"7032\" data-end=\"7145\"><strong data-start=\"7032\" data-end=\"7058\">Systemspecifik ledning<\/strong> \u2014 F\u00f6r TT-system, inkludera en N-PE-skyddsmodul f\u00f6r att hantera \u00f6versp\u00e4nningar fr\u00e5n jord.<\/p>\r\n<\/li>\r\n<\/ol>\r\n<p data-start=\"7147\" data-end=\"7255\">Att f\u00f6lja dessa riktlinjer s\u00e4kerst\u00e4ller att SPD:n fungerar enligt specifikationerna och f\u00f6ljer elektriska standarder.<\/p>\r\n\r\n<h2 data-start=\"7262\" data-end=\"7275\">Slutsats<\/h2>\r\n<p data-start=\"7277\" data-end=\"7508\">A <em><a href=\"https:\/\/www.britecelectric.com\/sv\/product-category\/ac-power-surge-protection\/type-2-surge-protective-device\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"7279\" data-end=\"7313\">\u00d6versp\u00e4nningsskydd typ 2<\/strong><\/a><\/em> \u00e4r ett viktigt element i skiktat elektriskt skydd. Det skyddar mot \u00e5terst\u00e5ende \u00f6versp\u00e4nningar fr\u00e5n blixtnedslag och interna v\u00e4xlingsh\u00e4ndelser, vilket s\u00e4kerst\u00e4ller utrustningens livsl\u00e4ngd och driftsstabilitet.<\/p>\r\n<p data-start=\"7510\" data-end=\"7767\">Genom att f\u00f6rst\u00e5 dess arbetsprincip, installationsregler och urvalsparametrar kan ingenj\u00f6rer och ink\u00f6pschefer specificera enheter som uppfyller systemkraven, \u00f6verensst\u00e4mmer med IEC\/EN 61643-11 och leverera tillf\u00f6rlitligt skydd i m\u00e5nga \u00e5r fram\u00f6ver.<\/p>\r\n<p data-start=\"7769\" data-end=\"7951\">R\u00e4tt installerad \u00e4r en typ 2 SPD inte bara en komponent \u2013 \u200b\u200bdet \u00e4r en f\u00f6rs\u00e4kring f\u00f6r ditt elsystem. L\u00e4s mer om <strong><em><a class=\"\" href=\"https:\/\/www.britecelectric.com\/sv\/blog\/surge-protection-for-solar-photovoltaic-systems\/\" target=\"_blank\" rel=\"noopener\" data-start=\"1609\" data-end=\"1719\">solenergi SPD-applikationer<\/a><\/em><\/strong> och hur man v\u00e4ljer r\u00e4tt.<\/p>","protected":false},"featured_media":2160,"parent":0,"menu_order":127,"template":"","meta":{"_acf_changed":false},"blog_category":[9],"class_list":["post-2154","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-industry-news"],"acf":{"des":"A Type 2 Surge Protection Device protects electrical systems from residual surges and switching surges. It is installed at the main distribution board. It works with Type 1 and Type 3 SPDs to form layered protection. This blog explains how it works, where to use it, how to choose it, and how to install it.","txt":"<h2 data-start=\"226\" data-end=\"241\">Introduction<\/h2>\r\n<p data-start=\"243\" data-end=\"597\">A <a href=\"https:\/\/www.britecelectric.com\/product-category\/ac-power-surge-protection\/type-2-surge-protective-device\/\"><strong data-start=\"245\" data-end=\"279\">Type 2 Surge Protection Device<\/strong><\/a> (Type 2 SPD) is the backbone of surge protection inside modern electrical systems. Installed at the main distribution board or control cabinet, it acts as the second shield in a layered defense strategy \u2014 catching residual surges left by upstream Type 1 SPDs and suppressing transients generated inside the network.<\/p>\r\n<p data-start=\"599\" data-end=\"986\">These devices protect against 8\/20 \u03bcs impulse currents that occur from lightning-induced surges, switching events, or utility disturbances.<\/p>\r\nTo ensure reliable, long-term protection, engineers and technical buyers need to understand several key aspects of a Type 2 SPD:\r\n<ul>\r\n \t<li><b>Definition:<\/b> What is it?<\/li>\r\n \t<li><b>How it works:<\/b> Its operating principles.<\/li>\r\n \t<li><b>Standards:<\/b> Which regulations does it meet?<\/li>\r\n \t<li><b>Installation and Selection:<\/b> The rules for choosing and installing it correctly.<\/li>\r\n<\/ul>\r\n<h2 data-start=\"993\" data-end=\"1042\">Definition of a Type 2 Surge Protection Device<\/h2>\r\n<p data-start=\"1044\" data-end=\"1268\">According to the <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\" target=\"_blank\" rel=\"noopener\"><em><strong>IEC\/EN 61643-11 standard<\/strong><\/em><\/a>, a **Type 2 SPD** is a Class II device. It is designed for locations that do not have direct lightning strikes. However, these locations still face a risk of strong transient overvoltages..<\/p>\r\n<p data-start=\"1270\" data-end=\"1290\">Key characteristics:<\/p>\r\n\r\n<ul data-start=\"1291\" data-end=\"1618\">\r\n \t<li data-start=\"1291\" data-end=\"1335\">\r\n<p data-start=\"1293\" data-end=\"1335\">Tested with 8\/20 \u03bcs current waveforms.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1336\" data-end=\"1466\">\r\n<p data-start=\"1338\" data-end=\"1466\">Typical nominal discharge current (In) is between 5\u201320 kA, with maximum discharge current (Imax) up to 40\u201380 kA.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1467\" data-end=\"1530\">\r\n<p data-start=\"1469\" data-end=\"1530\">Mounted on the load side of the electrical service panel.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1531\" data-end=\"1618\">\r\n<p data-start=\"1533\" data-end=\"1618\">Protects against both external residual surges and internal switching surges.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"1620\" data-end=\"1802\">In practical application, a Type 2 SPD sits after a Type 1 device and before any downstream Type 3 point-of-use protection, forming part of a multi-stage surge protection system.<\/p>\r\n<p data-start=\"1620\" data-end=\"1802\"><a href=\"https:\/\/www.britecelectric.com\/product-category\/ac-power-surge-protection\/type-2-surge-protective-device\/\" target=\"_blank\" rel=\"noopener\"><img class=\"alignnone  wp-image-2160\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/08\/BR-20-4P-1Type-2-Surge-Protection-Device.jpg-1024x1024.webp\" alt=\"\" width=\"900\" height=\"900\" \/><\/a><\/p>\r\n\r\n<h2 data-start=\"1809\" data-end=\"1859\">How does a <a href=\"https:\/\/www.britecelectric.com\/product-category\/ac-power-surge-protection\/type-2-surge-protective-device\/\" target=\"_blank\" rel=\"noopener\">Type 2 Surge Protection Device<\/a> work?<\/h2>\r\n<p data-start=\"1861\" data-end=\"2143\">A Type 2 SPD operates on the voltage clamping principle. Under normal voltage, it remains passive. When a transient surge exceeds its maximum continuous operating voltage (Uc), its internal components switch rapidly to a conductive state, shunting excess energy to ground.<\/p>\r\n<p data-start=\"2145\" data-end=\"2176\"><strong data-start=\"2145\" data-end=\"2176\">Typical components include:<\/strong><\/p>\r\n\r\n<ul data-start=\"2177\" data-end=\"2557\">\r\n \t<li data-start=\"2177\" data-end=\"2285\">\r\n<p data-start=\"2179\" data-end=\"2285\"><strong data-start=\"2179\" data-end=\"2210\">MOV (Metal Oxide Varistor):<\/strong> The primary clamping element, absorbing surge energy and reducing voltage.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2286\" data-end=\"2385\">\r\n<p data-start=\"2288\" data-end=\"2385\"><strong data-start=\"2288\" data-end=\"2320\">Hybrid circuits (MOV + GDT):<\/strong> Combine high surge capacity with improved long-term reliability.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2386\" data-end=\"2470\">\r\n<p data-start=\"2388\" data-end=\"2470\"><strong data-start=\"2388\" data-end=\"2418\">Thermal disconnect system:<\/strong> Isolates the SPD at end-of-life to maintain safety.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2471\" data-end=\"2557\">\r\n<p data-start=\"2473\" data-end=\"2557\"><strong data-start=\"2473\" data-end=\"2494\">Status indicator:<\/strong> Visual window or contact output to show operational condition.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"2559\" data-end=\"2582\"><strong data-start=\"2559\" data-end=\"2582\">Operation sequence:<\/strong><\/p>\r\n\r\n<ol data-start=\"2583\" data-end=\"2882\">\r\n \t<li data-start=\"2583\" data-end=\"2645\">\r\n<p data-start=\"2586\" data-end=\"2645\"><strong data-start=\"2586\" data-end=\"2602\">Normal mode:<\/strong> High resistance, no impact on the circuit.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2646\" data-end=\"2699\">\r\n<p data-start=\"2649\" data-end=\"2699\"><strong data-start=\"2649\" data-end=\"2665\">Surge event:<\/strong> Voltage rises above the Uc threshold.<\/p>\r\n<\/li>\r\n \t<li data-start=\"2700\" data-end=\"2819\">\r\n<p data-start=\"2703\" data-end=\"2819\"><strong data-start=\"2703\" data-end=\"2716\">Clamping:<\/strong> SPD diverts surge current to ground, lowering the voltage to a safe Up (voltage protection level).<\/p>\r\n<\/li>\r\n \t<li data-start=\"2820\" data-end=\"2882\">\r\n<p data-start=\"2823\" data-end=\"2882\"><strong data-start=\"2823\" data-end=\"2836\">Recovery:<\/strong> SPD returns to high-resistance standby state.<\/p>\r\n<\/li>\r\n<\/ol>\r\n<h2 data-start=\"2889\" data-end=\"2940\">The function of a Type 2 Surge Protection Device<\/h2>\r\n<p data-start=\"2942\" data-end=\"3106\">The primary role of a surge protection device Type 2 is to limit transient overvoltages to a level that downstream equipment can withstand without damage.<\/p>\r\n<p data-start=\"3108\" data-end=\"3122\">Key functions:<\/p>\r\n\r\n<ul data-start=\"3123\" data-end=\"3659\">\r\n \t<li data-start=\"3123\" data-end=\"3228\">\r\n<p data-start=\"3125\" data-end=\"3228\"><strong data-start=\"3125\" data-end=\"3154\">Residual surge limitation<\/strong> \u2014 reduces voltage after a Type 1 SPD has absorbed the bulk of the energy.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3229\" data-end=\"3356\">\r\n<p data-start=\"3231\" data-end=\"3356\"><strong data-start=\"3231\" data-end=\"3262\">Switching surge suppression<\/strong> \u2014 mitigates transients from motor starts, pump switching, or other inductive load operations.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3357\" data-end=\"3471\">\r\n<p data-start=\"3359\" data-end=\"3471\"><strong data-start=\"3359\" data-end=\"3383\">Equipment protection<\/strong> \u2014 prevents damage to sensitive electronics, PLCs, automation systems, and control gear.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3472\" data-end=\"3544\">\r\n<p data-start=\"3474\" data-end=\"3544\"><strong data-start=\"3474\" data-end=\"3496\">System reliability<\/strong> \u2014 reduces downtime from surge-related failures.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3545\" data-end=\"3659\">\r\n<p data-start=\"3547\" data-end=\"3659\"><strong data-start=\"3547\" data-end=\"3568\">Part of a cascade<\/strong> \u2014 sits between the service entrance protection (Type 1) and point-of-use devices (Type 3).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2 data-start=\"3666\" data-end=\"3716\">Applications of Type 2 Surge Protection Devices<\/h2>\r\n<a href=\"https:\/\/www.britecelectric.com\/attachment\/spd-install\/\" rel=\"attachment wp-att-2159\"><img class=\"alignnone size-full wp-image-2159\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/08\/SPD-install.jpg\" alt=\"\" width=\"745\" height=\"609\" \/><\/a>\r\n<p data-start=\"3718\" data-end=\"3747\">Type 2 SPDs are installed in:<\/p>\r\n\r\n<ul data-start=\"3748\" data-end=\"4151\">\r\n \t<li data-start=\"3748\" data-end=\"3810\">\r\n<p data-start=\"3750\" data-end=\"3810\">Industrial facilities with lightning protection systems.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3811\" data-end=\"3891\">\r\n<p data-start=\"3813\" data-end=\"3891\">Commercial buildings to protect HVAC, elevators, lighting, and IT systems.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3892\" data-end=\"3949\">\r\n<p data-start=\"3894\" data-end=\"3949\">Machine control cabinets for industrial automation.<\/p>\r\n<\/li>\r\n \t<li data-start=\"3950\" data-end=\"4034\">\r\n<p data-start=\"3952\" data-end=\"4034\">Renewable energy systems\u2014such as solar PV inverters and wind turbine controls\u2014require robust <a href=\"https:\/\/www.britecelectric.com\/product_category\/pv-surge-protection-type-2\/\" target=\"_blank\" rel=\"noopener\">surge protection<\/a> (see our <strong><em><a class=\"\" href=\"https:\/\/www.britecelectric.com\/blog\/solar-surge-protection-devices-selection-guide\/\" target=\"_blank\" rel=\"noopener\" data-start=\"201\" data-end=\"334\">Solar Surge Protection Devices Selection Guide<\/a><\/em><\/strong> and <strong><em><a class=\"\" href=\"https:\/\/www.britecelectric.com\/blog\/surge-protection-for-solar-photovoltaic-systems\/\" target=\"_blank\" rel=\"noopener\" data-start=\"339\" data-end=\"474\">Surge Protection for Solar Photovoltaic Systems<\/a><\/em><\/strong>).<\/p>\r\n<\/li>\r\n \t<li data-start=\"4035\" data-end=\"4093\">\r\n<p data-start=\"4037\" data-end=\"4093\">Hospitals and data centers where uptime is critical.<\/p>\r\n<\/li>\r\n \t<li data-start=\"4094\" data-end=\"4151\">\r\n<p data-start=\"4096\" data-end=\"4151\">Residential main panels for whole-house protection.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2 data-start=\"262\" data-end=\"316\">Type 1, Type 2, and Type 3 Surge Protection Devices<\/h2>\r\n<p data-start=\"318\" data-end=\"648\">Surge protection devices have three main types. Each type has a different job in the electrical system. You can read more in our detailed guide here: <em><strong><a class=\"\" href=\"https:\/\/www.britecelectric.com\/blog\/difference-between-type-1-type-2-and-type-3-surge-protective-devices\/\" target=\"_blank\" rel=\"noopener\" data-start=\"468\" data-end=\"647\">Difference Between Type 1, Type 2, and Type 3 Surge Protective Devices<\/a>.<\/strong><\/em><\/p>\r\n\r\n<table style=\"width: 60.5183%;\">\r\n<tbody>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\"><strong><b>Feature<\/b><\/strong><\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\"><strong><b>Type 1 SPD<\/b><\/strong><\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\"><strong><b>Type 2 SPD<\/b><\/strong><\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\"><strong><b>Type 3 SPD<\/b><\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\">Location<\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\">Installed at the service entrance.<\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\">Installed at the main distribution board.<\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\">Installed close to sensitive loads.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\">Test waveform<\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\">Tested with 10\/350 \u03bcs lightning impulse.<\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\">Tested with 8\/20 \u03bcs surge current.<\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\">Tested with 1.2\/50 \u03bcs voltage + 8\/20 \u03bcs current.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\">Purpose<\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\">Discharges direct lightning current.<\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\">Limits residual surges and switching surges.<\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\">Gives final protection for electronics.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\">Typical Up<\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\">\u2264 4 kV.<\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\">\u2264 2.5 kV.<\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\">\u2264 1.5 kV.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"width: 20.4466%;\" width=\"142\">Examples<\/td>\r\n<td style=\"width: 25.0372%;\" width=\"142\">Buildings with a lightning protection system (LPS).<\/td>\r\n<td style=\"width: 28.1389%;\" width=\"142\">Control panels and sub-distribution boards.<\/td>\r\n<td style=\"width: 58.2638%;\" width=\"142\">IT equipment and home electronics.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<p data-start=\"1409\" data-end=\"1423\"><strong data-start=\"1409\" data-end=\"1421\">Summary:<\/strong><\/p>\r\n\r\n<ul data-start=\"1424\" data-end=\"1706\">\r\n \t<li data-start=\"1424\" data-end=\"1494\">\r\n<p data-start=\"1426\" data-end=\"1494\"><strong data-start=\"1426\" data-end=\"1440\">Type 1 SPD<\/strong> stops most of the high-energy surge from lightning.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1495\" data-end=\"1610\">\r\n<p data-start=\"1497\" data-end=\"1610\"><strong data-start=\"1497\" data-end=\"1511\">Type 2 SPD<\/strong> is the middle line of defense. It reduces remaining surge voltage and controls switching surges.<\/p>\r\n<\/li>\r\n \t<li data-start=\"1611\" data-end=\"1706\">\r\n<p data-start=\"1613\" data-end=\"1706\"><strong data-start=\"1613\" data-end=\"1627\">Type 3 SPD<\/strong> is the last step. It protects sensitive electronics from small, fast surges.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2 data-start=\"4715\" data-end=\"4766\">How to select the right surge protection device?<\/h2>\r\n<p data-start=\"4768\" data-end=\"4922\">When choosing the best Type 2 surge protection device, selection should be based on system compatibility, surge risk level, and equipment sensitivity.<\/p>\r\n<p data-start=\"4924\" data-end=\"5057\"><strong data-start=\"4924\" data-end=\"4976\">1. Match system voltage and earthing arrangement<\/strong><br data-start=\"4976\" data-end=\"4979\" \/>Different systems \u2014 TT, TN-S, TN-C, IT \u2014 require different SPD configurations:<\/p>\r\n\r\n<ul data-start=\"5058\" data-end=\"5212\">\r\n \t<li data-start=\"5058\" data-end=\"5104\">\r\n<p data-start=\"5060\" data-end=\"5104\"><strong data-start=\"5060\" data-end=\"5066\">4P<\/strong> (all-pole protection) for TN systems.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5105\" data-end=\"5212\">\r\n<p data-start=\"5107\" data-end=\"5212\"><strong data-start=\"5107\" data-end=\"5114\">3+1<\/strong> configuration (L-N protection plus N-PE module) for TT systems to handle N-PE overvoltage events.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"5214\" data-end=\"5404\"><strong data-start=\"5214\" data-end=\"5272\">2. Determine Uc (Maximum Continuous Operating Voltage)<\/strong><br data-start=\"5272\" data-end=\"5275\" \/>Uc should be slightly above the nominal system voltage to prevent unnecessary triggering but low enough for effective protection.<\/p>\r\n<p data-start=\"5406\" data-end=\"5449\"><strong data-start=\"5406\" data-end=\"5447\">3. Check discharge current capability<\/strong><\/p>\r\n\r\n<ul data-start=\"5450\" data-end=\"5570\">\r\n \t<li data-start=\"5450\" data-end=\"5496\">\r\n<p data-start=\"5452\" data-end=\"5496\"><strong data-start=\"5452\" data-end=\"5487\">Nominal discharge current (In):<\/strong> 5\u201320 kA.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5497\" data-end=\"5570\">\r\n<p data-start=\"5499\" data-end=\"5570\"><strong data-start=\"5499\" data-end=\"5536\">Maximum discharge current (Imax):<\/strong> 20\u201380 kA depending on risk level.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p data-start=\"5572\" data-end=\"5721\"><strong data-start=\"5572\" data-end=\"5608\">4. Voltage protection level (Up)<\/strong><br data-start=\"5608\" data-end=\"5611\" \/>Lower Up means better protection \u2014 aim for \u2264 2.5 kV for general equipment, \u2264 1.5 kV for sensitive electronics.<\/p>\r\n<p data-start=\"5723\" data-end=\"5862\"><strong data-start=\"5723\" data-end=\"5767\">5. Temporary overvoltage (TOV) withstand<\/strong><br data-start=\"5767\" data-end=\"5770\" \/>Ensure the SPD can survive temporary overvoltage conditions from faults or switching events.<\/p>\r\n<p data-start=\"5864\" data-end=\"5892\"><strong data-start=\"5864\" data-end=\"5890\">6. Additional features<\/strong><\/p>\r\n\r\n<ul data-start=\"5893\" data-end=\"6019\">\r\n \t<li data-start=\"5893\" data-end=\"5935\">\r\n<p data-start=\"5895\" data-end=\"5935\">Pluggable modules for quick maintenance.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5936\" data-end=\"5975\">\r\n<p data-start=\"5938\" data-end=\"5975\">Remote alarm contacts for monitoring.<\/p>\r\n<\/li>\r\n \t<li data-start=\"5976\" data-end=\"6019\">\r\n<p data-start=\"5978\" data-end=\"6019\">Thermal disconnect and visual indicators.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h2 data-start=\"6026\" data-end=\"6076\">How to install a Type 2 surge protection device<\/h2>\r\n<a href=\"https:\/\/www.britecelectric.com\/attachment\/type-2-spd-install\/\" rel=\"attachment wp-att-2158\"><img class=\"alignnone size-full wp-image-2158\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2025\/08\/Type-2-SPD-install.jpg\" alt=\"\" width=\"732\" height=\"615\" \/><\/a>\r\n<p data-start=\"6078\" data-end=\"6144\"><strong data-start=\"6078\" data-end=\"6144\">Installation best practices from field engineering experience:<\/strong><\/p>\r\n\r\n<ol data-start=\"6145\" data-end=\"7145\">\r\n \t<li data-start=\"6145\" data-end=\"6266\">\r\n<p data-start=\"6148\" data-end=\"6266\"><strong data-start=\"6148\" data-end=\"6160\">Location<\/strong> \u2014 Mount as close as possible to the main distribution board busbars or the equipment you want to protect.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6267\" data-end=\"6362\">\r\n<p data-start=\"6270\" data-end=\"6362\"><strong data-start=\"6270\" data-end=\"6293\">Parallel connection<\/strong> \u2014 Type 2 SPDs are usually connected in parallel to the power supply.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6363\" data-end=\"6506\">\r\n<p data-start=\"6366\" data-end=\"6506\"><strong data-start=\"6366\" data-end=\"6381\">Lead length<\/strong> \u2014 Keep the combined length of phase, neutral, and ground conductors under 0.5 m to avoid raising the protection voltage.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6507\" data-end=\"6619\">\r\n<p data-start=\"6510\" data-end=\"6619\"><strong data-start=\"6510\" data-end=\"6537\">Conductor cross-section<\/strong> \u2014 At least 6 mm\u00b2 copper for Type 2; larger sizes for higher-capacity devices.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6620\" data-end=\"6716\">\r\n<p data-start=\"6623\" data-end=\"6716\"><strong data-start=\"6623\" data-end=\"6635\">Earthing<\/strong> \u2014 Connect directly to the main equipotential bonding bar with the shortest path.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6717\" data-end=\"6840\">\r\n<p data-start=\"6720\" data-end=\"6840\"><strong data-start=\"6720\" data-end=\"6746\">Overcurrent protection<\/strong> \u2014 Use fuses or circuit breakers sized according to the SPD's maximum short-circuit withstand.<\/p>\r\n<\/li>\r\n \t<li data-start=\"6841\" data-end=\"7028\">\r\n<p data-start=\"6844\" data-end=\"7028\"><strong data-start=\"6844\" data-end=\"6880\">Coordination in cascaded systems<\/strong> \u2014 If installed downstream of a Type 1 SPD, maintain a separation distance (&gt;10 m) or install a decoupling inductor to ensure proper energy sharing.<\/p>\r\n<\/li>\r\n \t<li data-start=\"7029\" data-end=\"7145\">\r\n<p data-start=\"7032\" data-end=\"7145\"><strong data-start=\"7032\" data-end=\"7058\">System-specific wiring<\/strong> \u2014 For TT systems, include an N-PE protection module to handle neutral-to-earth surges.<\/p>\r\n<\/li>\r\n<\/ol>\r\n<p data-start=\"7147\" data-end=\"7255\">Following these guidelines ensures the SPD performs to specification and complies with electrical standards.<\/p>\r\n\r\n<h2 data-start=\"7262\" data-end=\"7275\">Conclusion<\/h2>\r\n<p data-start=\"7277\" data-end=\"7508\">A <em><a href=\"https:\/\/www.britecelectric.com\/product-category\/ac-power-surge-protection\/type-2-surge-protective-device\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"7279\" data-end=\"7313\">Type 2 Surge Protection Device<\/strong><\/a><\/em> is a vital element in layered electrical protection. It safeguards against residual surges from lightning and internal switching events, ensuring equipment longevity and operational stability.<\/p>\r\n<p data-start=\"7510\" data-end=\"7767\">By understanding its working principle, installation rules, and selection parameters, engineers and procurement managers can specify devices that meet system requirements, comply with IEC\/EN 61643-11, and deliver reliable protection for years to come.<\/p>\r\n<p data-start=\"7769\" data-end=\"7951\">Correctly installed, a Type 2 SPD is not just a component \u2014 it\u2019s an insurance policy for your electrical system. Learn more about <strong><em><a class=\"\" href=\"https:\/\/www.britecelectric.com\/blog\/surge-protection-for-solar-photovoltaic-systems\/\" target=\"_blank\" rel=\"noopener\" data-start=\"1609\" data-end=\"1719\">solar SPD applications<\/a><\/em><\/strong> and how to choose the right one.<\/p>"},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/blog\/2154","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/media\/2160"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/media?parent=2154"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/blog_category?post=2154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}