{"id":2288,"date":"2025-12-23T09:12:43","date_gmt":"2025-12-23T01:12:43","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&p=2288"},"modified":"2025-12-18T14:30:27","modified_gmt":"2025-12-18T06:30:27","slug":"what-is-dc-surge-protection-devicewhat-is-a-24v-dc-power-supply","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/fi\/blog\/what-is-dc-surge-protection-device-what-is-a-24v-dc-power-supply\/","title":{"rendered":"Mik\u00e4 on DC-ylij\u00e4nnitesuojalaite?Mik\u00e4 on 24 V:n tasavirtal\u00e4hde?"},"content":{"rendered":"DC ylij\u00e4nnitesuojalaitteet<\/a> (DC SPD) ja 24 V DC -virtal\u00e4hteet ovat avainkomponentteja, jotka yhdess\u00e4 muodostavat puolustuslinjan ohimenevi\u00e4 ylij\u00e4nnitteit\u00e4 vastaan \u200b\u200bja varmistavat j\u00e4rjestelm\u00e4n jatkuvuuden. Niiden toimintaperiaatteiden, valintakriteerien ja synergististen vaikutusten ymm\u00e4rt\u00e4minen on ratkaisevan t\u00e4rke\u00e4\u00e4 turvallisten ja tehokkaiden s\u00e4hk\u00f6j\u00e4rjestelmien suunnittelussa ja yll\u00e4pidossa.\r\n

Mik\u00e4 on DC-ylij\u00e4nnitesuojalaite?<\/h2>\r\n

M\u00e4\u00e4ritelm\u00e4t<\/h3>\r\nDC-ylij\u00e4nnitesuojalaitteet ovat salama- ja ylij\u00e4nnitesuojalaitteita, jotka on suunniteltu erityisesti tasavirtapiireihin. Ne voivat reagoida nanosekunnissa ja purkaa turvallisesti salaman induktion, kytkent\u00e4toimintojen tai s\u00e4hk\u00f6staattisen purkauksen aiheuttamat ohimenev\u00e4t ylij\u00e4nnitteet (piikit), mik\u00e4 suojaa herkki\u00e4 alavirran elektronisia laitteita vaurioilta.\r\n

Suojakomponentit<\/h3>\r\nIts core protection components typically include:\r\n\r\nMetal oxide varistors (MOVs): Fast response, used to absorb medium-energy surges.\r\n\r\nGas discharge tubes (GDTs): High current capacity, commonly used to discharge high-energy initial surge currents.\r\n\r\nTransient voltage suppressor diodes (TVS): Precise voltage clamping and extremely fast response, commonly used to protect precision circuits.\r\n

Suorituskykyparametrit<\/h3>\r\nMaximum Continuous Operating Voltage (Uc): The maximum DC voltage (e.g., 24V) that the equipment can safely withstand over a long period.\r\n\r\nNominal Discharge Current (In): The standard value for withstanding an 8\/20\u03bcs waveform inrush current, representing its conventional protection capability.\r\n\r\nMaximum Discharge Current (Imax): The maximum inrush current that the equipment can withstand in a single incident without damage.\r\n\r\nVoltage Protection Level (Up): The residual voltage across the equipment under an inrush. The lower this value, the better the protection for downstream equipment.\r\n\r\nResponse Time: The time from detecting an overvoltage to initiating action. The shorter the better.\r\n\r\n \r\n\r\n\"BR-40<\/a>\r\n

Mik\u00e4 on 24 V DC -virtal\u00e4hde?<\/h2>\r\n

M\u00e4\u00e4ritelm\u00e4<\/h3>\r\nA 24V DC power supply is a device that converts AC mains power (such as 220V AC) or other power sources into and provides stable, clean 24V DC power. It is the \"heart\" of industrial control systems.\r\n

Toiminto<\/h3>\r\nSen p\u00e4\u00e4toiminnot ovat muunnos, j\u00e4nnitteen s\u00e4\u00e4t\u00f6 ja suodatus, joilla varmistetaan jatkuva ja vakaa 24 V DC virransy\u00f6tt\u00f6 logiikalle, antureille, releille, toimilaitteille ja muille laitteille riippumatta siit\u00e4, miten tuloj\u00e4nnite vaihtelee tai miten kuormitus muuttuu.\r\n

Miksi 24 V:st\u00e4 on tullut teollisuuden standardij\u00e4nnite<\/h3>\r\nSafe Voltage: Falls within the safe extra-low voltage (SELV) range, posing an extremely low risk of electric shock to humans.\r\n\r\nWide Compatibility: The vast majority of industrial sensors, controllers, and actuators are designed for 24V power supply.\r\n\r\nBalance of Loss and Efficiency: Compared to 12V, it draws less current, has lower line losses and voltage drops for the same power; compared to 48V, it offers higher safety and more cost-effective components.\r\n\r\nStandardization: It has become the common language in the global industrial automation field.\r\n

Keskeiset suorituskykyindikaattorit<\/h3>\r\nOutput accuracy and stability: Voltage fluctuations and ripple noise should be minimized.\r\n\r\nEfficiency: High conversion efficiency means less energy loss and heat generation.\r\n\r\nProtection rating (IP): Protection against dust and water.\r\n\r\nOperating temperature range: Suitable for wide temperature requirements in industrial environments.\r\n

Sovellusskenaariot<\/h3>\r\n24V ylij\u00e4nnitesuojaa k\u00e4ytet\u00e4\u00e4n laajalti tehdasautomatisoiduissa tuotantolinjoissa, prosessinohjausj\u00e4rjestelmiss\u00e4, rakennusautomaatiossa, viestint\u00e4tukiasemissa ja aurinkos\u00e4hk\u00f6j\u00e4rjestelmiss\u00e4.\r\n

Toimii yhdess\u00e4 virtal\u00e4hteen kanssa<\/h2>\r\nA 24V DC power supply and a DC SPD form a perfect combination of source purification and path defense. The power supply ensures the provision of \"clean\" energy, while the SPD focuses on resisting external \"contamination\" (surges) from power lines or signal lines. They are usually connected in series in the circuit: after the AC power supply is converted to 24V DC, it is first \"filtered\" by the DC SPD before being sent to the terminal equipment, thus building a full-path protection solution from source to end.\r\n

Avainkohdat 24 V SPD:n valinnassa<\/h2>\r\nVoltage Matching: Ensure the SPD's Uc value is slightly higher than the system's maximum continuous operating voltage. For a 24V system, an SPD with a Uc of 30V or 35V is typically selected.\r\n\r\nProtection Level: Select an SPD with a sufficiently low Up value based on the withstand voltage capability of the protected equipment.\r\n\r\nCurrent Handling Capacity: Select appropriate In and Imax values \u200b\u200bbased on the installation location (e.g., main distribution terminal, equipment front end) and local thunderstorm day conditions.\r\n\r\nWiring Method: Confirm whether it is a parallel or series connection and match the corresponding terminal blocks.\r\n\r\nStatus Indication: Products with remote alarms or visual windows (e.g., green\/red) are preferred for ease of maintenance.\r\n

Asennus ja huolto<\/h2>\r\nInstallation: Install as close as possible to the protected equipment. Use short, straight, and thick wiring to reduce residual voltage from lead inductance. Ensure proper grounding.\r\n\r\nMaintenance: Regularly check the status indicator window (ideally annually or around the rainy season). If the indicator is faulty (e.g., turns red), replace it immediately. DC SPD manufacturer kindly reminds you to record lightning strike incidents and check the surge protector status promptly.\r\n

FAQ<\/h2>\r\nDC-ylij\u00e4nnitesuojan kytkeminen<\/strong>\r\n\r\nDC SPD:t kytket\u00e4\u00e4n tyypillisesti rinnan suojapiirin plus- ja miinusnavan v\u00e4liin, ja niiden maadoitusliitin on kytkett\u00e4v\u00e4 j\u00e4rjestelm\u00e4n suojamaahan (PE) lyhyimm\u00e4ll\u00e4 ja paksuimmalla mahdollisella johdolla. Tuoteopasta tulee noudattaa tarkasti.\r\n\r\nVoidaanko 24 V DC SPD:t\u00e4 ja AC SPD:t\u00e4 k\u00e4ytt\u00e4\u00e4 vaihtokelpoisesti?<\/strong>\r\n\r\nEi todellakaan. Suunnitteluperiaatteet, valokaaren sammutusominaisuudet ja parametrien kalibroinnit ovat t\u00e4ysin erilaisia. On vaikeampaa k\u00e4ytt\u00e4\u00e4 DC SPD:t\u00e4 DC-seurantavirran katkaisemiseen. AC SPD:n v\u00e4\u00e4rink\u00e4ytt\u00f6 tasavirtapiiriss\u00e4 johtaa siihen, ett\u00e4 valokaaren sammuttaminen ei onnistu kunnolla, mik\u00e4 voi aiheuttaa laitteen syttymisen tuleen.\r\n\r\nKuinka voin m\u00e4\u00e4ritt\u00e4\u00e4, toimiiko DC 24V SPD edelleen oikein?<\/strong>\r\n\r\nThe most intuitive way is to observe its status indicator (usually a green\/red window or LED). Green indicates normal operation, while red\/off indicates failure and needs replacement. You can also use a multimeter to measure its online voltage; if it's close to a short circuit and the device is hot, it may be damaged.\r\n\r\nMiksi aurinkoj\u00e4rjestelm\u00e4t tarvitsevat DC-ylij\u00e4nnitesuojalaitteita (SPD)?<\/strong>\r\n\r\nAurinkos\u00e4hk\u00f6moduulit kattavat suuren alueen ja ovat eritt\u00e4in herkki\u00e4 suorille tai indusoiduille salamaniskuille. Salamavirta voi p\u00e4\u00e4st\u00e4 invertteriin ja ohjausj\u00e4rjestelm\u00e4\u00e4n tasavirtav\u00e4yl\u00e4n kautta aiheuttaen merkitt\u00e4vi\u00e4 vahinkoja. Siksi aurinkos\u00e4hk\u00f6isen DC SPD:n asentaminen DC-puolelle (moduulien ja invertterin v\u00e4liin) on ratkaisevan t\u00e4rke\u00e4\u00e4.\r\n\r\nMit\u00e4 johdotuksen varotoimia tulisi noudattaa 24 V DC SPD:t\u00e4 asennettaessa?<\/strong>\r\n\r\nThe key principles are \"short, straight, and thick\". 1) The length of the grounding wire should be less than 0.5 meters; 2) Avoid forming loops; 3) The cross-sectional area of \u200b\u200bthe conductor must meet the requirements for discharging large current (usually not less than 4 mm\u00b2); 4) Ensure that all connection points are tight and free from oxidation.\r\n\r\nLineaarisen ja hakkurivirtal\u00e4hteen vertailu 24 V sovelluksissa<\/strong>\r\n\r\nLineaarisilla tehol\u00e4hteill\u00e4 on alhainen l\u00e4hd\u00f6n aaltoilu ja alhainen kohina, mutta ne ovat kooltaan suuria ja teholtaan alhaisia \u200b\u200b(noin 40-60%), mik\u00e4 tekee niist\u00e4 sopivia tarkkuusmittauslaitteisiin, jotka ovat eritt\u00e4in herkki\u00e4 melulle. Hakkuritehol\u00e4hteet ovat kooltaan pieni\u00e4, eritt\u00e4in tehokkaita (yleens\u00e4 >85%) ja voivat mukautua laajalle tuloj\u00e4nnitealueelle, mik\u00e4 tekee niist\u00e4 valtavirran teollisen ohjauksen. Niiden korkeataajuinen kytkent\u00e4 tuottaa kuitenkin jonkin verran s\u00e4hk\u00f6magneettista kohinaa, jota tarvitaank\u00e4sitell\u00e4 oikein.\r\n

Johtop\u00e4\u00e4t\u00f6s<\/h2>\r\nIn industrial automation and new energy fields, 24V DC power supplies and DC surge protection devices are a complementary and indispensable core combination.\r\n\r\nTake action now to build a robust defense for your critical systems! Don't wait until a lightning strike or power surge causes irreparable damage to realize the importance of protection.","protected":false},"featured_media":1814,"parent":0,"menu_order":89,"template":"","meta":{"_acf_changed":false},"blog_category":[9],"class_list":["post-2288","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-industry-news"],"acf":{"des":"DC surge protection devices (DC SPD) and 24V DC power supplies are key components that together form a line of defense against transient overvoltages and ensure system continuity. Understanding their working principles, selection criteria, and synergistic effects is crucial for designing and maintaining safe and efficient electrical systems.","txt":"DC surge protection devices<\/a> (DC SPD) and 24V DC power supplies are key components that together form a line of defense against transient overvoltages and ensure system continuity. Understanding their working principles, selection criteria, and synergistic effects is crucial for designing and maintaining safe and efficient electrical systems.\r\n

What Is DC Surge Protection Device?<\/h2>\r\n

Definitions<\/h3>\r\nDC surge protection devices are lightning and surge protection devices specifically designed for DC circuits. They can respond within nanoseconds, safely discharging transient overvoltages (surges) caused by lightning induction, switching operations, or electrostatic discharge to the ground, thereby protecting sensitive downstream electronic equipment from damage.\r\n

Protective Components<\/h3>\r\nIts core protection components typically include:\r\n\r\nMetal oxide varistors (MOVs): Fast response, used to absorb medium-energy surges.\r\n\r\nGas discharge tubes (GDTs): High current capacity, commonly used to discharge high-energy initial surge currents.\r\n\r\nTransient voltage suppressor diodes (TVS): Precise voltage clamping and extremely fast response, commonly used to protect precision circuits.\r\n

Performance Parameters<\/h3>\r\nMaximum Continuous Operating Voltage (Uc): The maximum DC voltage (e.g., 24V) that the equipment can safely withstand over a long period.\r\n\r\nNominal Discharge Current (In): The standard value for withstanding an 8\/20\u03bcs waveform inrush current, representing its conventional protection capability.\r\n\r\nMaximum Discharge Current (Imax): The maximum inrush current that the equipment can withstand in a single incident without damage.\r\n\r\nVoltage Protection Level (Up): The residual voltage across the equipment under an inrush. The lower this value, the better the protection for downstream equipment.\r\n\r\nResponse Time: The time from detecting an overvoltage to initiating action. The shorter the better.\r\n\r\n \r\n\r\n\"BR-40<\/a>\r\n

What Is A 24V DC Power Supply?<\/h2>\r\n

Definition<\/h3>\r\nA 24V DC power supply is a device that converts AC mains power (such as 220V AC) or other power sources into and provides stable, clean 24V DC power. It is the \"heart\" of industrial control systems.\r\n

Function<\/h3>\r\nIts main functions are conversion, voltage regulation and filtering, ensuring that a continuous and stable 24V DC power supply can be provided to PLCs, sensors, relays, actuators and other equipment, regardless of how the input voltage fluctuates or how the load changes.\r\n

Why 24V Has Become Industrial Standard Voltage<\/h3>\r\nSafe Voltage: Falls within the safe extra-low voltage (SELV) range, posing an extremely low risk of electric shock to humans.\r\n\r\nWide Compatibility: The vast majority of industrial sensors, controllers, and actuators are designed for 24V power supply.\r\n\r\nBalance of Loss and Efficiency: Compared to 12V, it draws less current, has lower line losses and voltage drops for the same power; compared to 48V, it offers higher safety and more cost-effective components.\r\n\r\nStandardization: It has become the common language in the global industrial automation field.\r\n

Key Performance Indicators<\/h3>\r\nOutput accuracy and stability: Voltage fluctuations and ripple noise should be minimized.\r\n\r\nEfficiency: High conversion efficiency means less energy loss and heat generation.\r\n\r\nProtection rating (IP): Protection against dust and water.\r\n\r\nOperating temperature range: Suitable for wide temperature requirements in industrial environments.\r\n

Application Scenarios<\/h3>\r\n24V Surge protector is widely used in factory automated production lines, process control systems, building automation, communication base stations, and solar photovoltaic systems.\r\n

Working In Conjunction With Power Supply<\/h2>\r\nA 24V DC power supply and a DC SPD form a perfect combination of source purification and path defense. The power supply ensures the provision of \"clean\" energy, while the SPD focuses on resisting external \"contamination\" (surges) from power lines or signal lines. They are usually connected in series in the circuit: after the AC power supply is converted to 24V DC, it is first \"filtered\" by the DC SPD before being sent to the terminal equipment, thus building a full-path protection solution from source to end.\r\n

Key Points For Selecting 24V SPD<\/h2>\r\nVoltage Matching: Ensure the SPD's Uc value is slightly higher than the system's maximum continuous operating voltage. For a 24V system, an SPD with a Uc of 30V or 35V is typically selected.\r\n\r\nProtection Level: Select an SPD with a sufficiently low Up value based on the withstand voltage capability of the protected equipment.\r\n\r\nCurrent Handling Capacity: Select appropriate In and Imax values \u200b\u200bbased on the installation location (e.g., main distribution terminal, equipment front end) and local thunderstorm day conditions.\r\n\r\nWiring Method: Confirm whether it is a parallel or series connection and match the corresponding terminal blocks.\r\n\r\nStatus Indication: Products with remote alarms or visual windows (e.g., green\/red) are preferred for ease of maintenance.\r\n

Installation And Maintenance<\/h2>\r\nInstallation: Install as close as possible to the protected equipment. Use short, straight, and thick wiring to reduce residual voltage from lead inductance. Ensure proper grounding.\r\n\r\nMaintenance: Regularly check the status indicator window (ideally annually or around the rainy season). If the indicator is faulty (e.g., turns red), replace it immediately. DC SPD manufacturer kindly reminds you to record lightning strike incidents and check the surge protector status promptly.\r\n

FAQ<\/h2>\r\nHow To Connect DC Surge Protector<\/strong>\r\n\r\nDC SPDs are typically connected in parallel between the positive and negative terminals of the protected circuit, and their grounding terminal must be connected to the system protective earth (PE) with the shortest and thickest possible wire. The product manual should be strictly followed.\r\n\r\nCan 24V DC SPD And AC SPD Be Used Interchangeably?<\/strong>\r\n\r\nAbsolutely not. The design principles, arc-extinguishing capabilities, and parameter calibrations of the two are completely different. It is more difficult to use a DC SPD to cut off DC follow current. Misusing an AC SPD in a DC circuit will result in the inability to extinguish the arc properly, which may cause the equipment to catch fire.\r\n\r\nHow Can I Determine If DC 24V SPD Is Still Working Properly?<\/strong>\r\n\r\nThe most intuitive way is to observe its status indicator (usually a green\/red window or LED). Green indicates normal operation, while red\/off indicates failure and needs replacement. You can also use a multimeter to measure its online voltage; if it's close to a short circuit and the device is hot, it may be damaged.\r\n\r\nWhy Do Solar Systems Need DC Surge Protection Devices (SPD)?<\/strong>\r\n\r\nPhotovoltaic modules cover a large area and are highly susceptible to direct or induced lightning strikes. Lightning current can enter the inverter and control system through the DC bus line, causing significant damage. Therefore, installing a dedicated photovoltaic DC SPD on the DC side (between the modules and the inverter) is crucial.\r\n\r\nWhat Wiring Precautions Should Be Taken When Installing 24V DC SPD?<\/strong>\r\n\r\nThe key principles are \"short, straight, and thick\". 1) The length of the grounding wire should be less than 0.5 meters; 2) Avoid forming loops; 3) The cross-sectional area of \u200b\u200bthe conductor must meet the requirements for discharging large current (usually not less than 4 mm\u00b2); 4) Ensure that all connection points are tight and free from oxidation.\r\n\r\nComparison Between Linear And Switching Power Supply In 24V Applications<\/strong>\r\n\r\nLinear power supplies have low output ripple and low noise, but are large in size and low in efficiency (approximately 40-60%), making them suitable for precision measuring equipment that is extremely sensitive to noise. Switching power supplies are small in size, highly efficient (typically >85%), and can adapt to a wide input voltage range, making them the mainstream choice for industrial control. However, their high-frequency switching generates some electromagnetic noise, which needs to be properly handled.\r\n

Conclusion<\/h2>\r\nIn industrial automation and new energy fields, 24V DC power supplies and DC surge protection devices are a complementary and indispensable core combination.\r\n\r\nTake action now to build a robust defense for your critical systems! Don't wait until a lightning strike or power surge causes irreparable damage to realize the importance of protection."},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/blog\/2288","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/media\/1814"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/media?parent=2288"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/fi\/wp-json\/wp\/v2\/blog_category?post=2288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}