{"id":850,"date":"2023-12-18T15:18:21","date_gmt":"2023-12-18T07:18:21","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&p=850"},"modified":"2024-09-05T16:40:03","modified_gmt":"2024-09-05T08:40:03","slug":"surge-circuit-breakers-scb","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/da\/blog\/surge-circuit-breakers-scb\/","title":{"rendered":"SURGE CIRCUIT BREAKERS (SCB)"},"content":{"rendered":"BRITEC Surge Circuit Breakers (SCB) are an over current protection device specially designed for the protection of parallel connected single port AC power line surge protectors\r\n\r\nTraditionally SPD over current protection was provided by conventional circuit breakers or fuses, but this is not ideal for two reasons;\r\n
    \r\n \t
  1. For at passere de h\u00f8jfrekvente oversp\u00e6ndingsstr\u00f8mme skal sikringerne eller kredsl\u00f8bsafbryderne have en h\u00f8jere vekselstr\u00f8msklassificering end i overensstemmelse med god beskyttelse mod overophedning og brand inden for SPD.<\/li>\r\n \t
  2. Oversp\u00e6ndingsstr\u00f8mme kan f\u00e5 sikringerne til at spr\u00e6nge eller en str\u00f8mafbryder til at udl\u00f8se, selv n\u00e5r SPD'en stadig er sund, dette kaldes generende udl\u00f8sning, og det bliver muligvis ikke detekteret, dette efterlader anl\u00e6gget uden oversp\u00e6ndingsbeskyttelse, indtil udl\u00f8sningen bem\u00e6rkes.<\/li>\r\n<\/ol>\r\nSCB\u2019s are designed to discriminate between power frequency (50-60Hz) currents and the high frequency currents produced by lightning and power line switching transients.\r\n\r\nThis discrimination means that are able to have markedly different tripping currents for the two types of waveform allowing them to provide a high degree of protection to the SPD at power line frequencies whilst allowing very large surge currents to be passed without the risk of nuisance tripping that is characteristic of fuses and conventional circuit breakers when used to protect parallel connected SPD\u2019s.\r\n\r\nThe SCB eliminates these problems by having an AC power (50-60Hz) tripping current of only 3 Amps whilst also having a very high surge current tripping value of 80,000 Amps at 8\/20\u03bcs, or 25kA at 10\/350 \u03bcs depending on the model. It is this ability to discriminate between power and surge frequencies that make the SCB the ideal choice for protection of parallel connected surge diverters.\r\n\r\nSCB, with excellent characteristics of high breaking capacity of power frequency short-circuit current, strong withstanding capacity of impulse and 3 A tripping action under power frequency current, meets the SPD matching requirements.","protected":false},"featured_media":851,"parent":0,"menu_order":152,"template":"","meta":{"_acf_changed":false},"blog_category":[8],"class_list":["post-850","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-company-news"],"acf":{"des":"BRITEC Surge Circuit Breakers (SCB) are an over current protection device specially designed for the protection of parallel connected single port AC power line surge protectors","txt":"BRITEC Surge Circuit Breakers (SCB) are an over current protection device specially designed for the protection of parallel connected single port AC power line surge protectors\r\n\r\nTraditionally SPD over current protection was provided by conventional circuit breakers or fuses, but this is not ideal for two reasons;\r\n
      \r\n \t
    1. To pass the high frequency surge currents the fuses or circuit breakers need to have a higher AC current rating than consistent with good protection against overheating and fire within the SPD.<\/li>\r\n \t
    2. Surge currents can cause the fuses to blow or a circuit breaker to trip even when the SPD is still healthy, this is called nuisance tripping and it may not be detected, this leaves the facility with no surge protection until the trip is noticed.<\/li>\r\n<\/ol>\r\nSCB\u2019s are designed to discriminate between power frequency (50-60Hz) currents and the high frequency currents produced by lightning and power line switching transients.\r\n\r\nThis discrimination means that are able to have markedly different tripping currents for the two types of waveform allowing them to provide a high degree of protection to the SPD at power line frequencies whilst allowing very large surge currents to be passed without the risk of nuisance tripping that is characteristic of fuses and conventional circuit breakers when used to protect parallel connected SPD\u2019s.\r\n\r\nThe SCB eliminates these problems by having an AC power (50-60Hz) tripping current of only 3 Amps whilst also having a very high surge current tripping value of 80,000 Amps at 8\/20\u03bcs, or 25kA at 10\/350 \u03bcs depending on the model. It is this ability to discriminate between power and surge frequencies that make the SCB the ideal choice for protection of parallel connected surge diverters.\r\n\r\nSCB, with excellent characteristics of high breaking capacity of power frequency short-circuit current, strong withstanding capacity of impulse and 3 A tripping action under power frequency current, meets the SPD matching requirements."},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/da\/wp-json\/wp\/v2\/blog\/850","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/da\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/da\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/da\/wp-json\/wp\/v2\/media\/851"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/da\/wp-json\/wp\/v2\/media?parent=850"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/da\/wp-json\/wp\/v2\/blog_category?post=850"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}