{"title":"Current Transformer","description":"\u003cp\u003eCurrent transformers (CTs) are specialized instrument transformers used in power systems for measurement and protection. The primary winding is connected in series with the high-voltage or high-current main circuit, while the secondary winding outputs a standardized low current signal, operating on the principle of electromagnetic induction.\u003c\/p\u003e\n\n\u003ch2\u003eCore Functions\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Conversion\u003c\/strong\u003e — Converts hundreds or thousands of amperes in the main circuit to a standardized secondary output (typically 5A or 1A), enabling connection to standard meters, energy meters, and protection relays that cannot directly measure high currents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Isolation for Safety\u003c\/strong\u003e — The primary and secondary windings are fully insulated and isolated, separating the high-voltage primary circuit from the low-voltage instrument circuit to protect maintenance and operations personnel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandardized Equipment Interface\u003c\/strong\u003e — Regardless of primary current magnitude, the secondary output is always a standard value, allowing instruments and protection devices to be universally compatible without custom designs for each current level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection Sampling Signal\u003c\/strong\u003e — Supplies current signals to protection relays. During short circuits or overloads, the CT captures fault currents and triggers protection tripping to isolate the fault.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy Metering\u003c\/strong\u003e — Works with energy meters to accurately measure power consumption of high-voltage and high-load equipment — a core component in industrial and substation billing systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eImportant Safety Note\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe secondary winding of a current transformer must never be left open-circuit.\u003c\/strong\u003e An open secondary will generate dangerously high voltage, creating a risk of electric shock and equipment damage.\u003c\/p\u003e","products":[{"product_id":"wlct-three-phase-current-transformer","title":"WLCT Three Phase Current Transformer","description":"\u003ch2\u003eWLCT Three Phase Current Transformer\u003c\/h2\u003e\n\u003cp\u003eThe WLCT three-phase current transformer is designed for accurate current measurement and protection in low-voltage intelligent switchgear systems. With a standardized 5A secondary output and 5P10 protection class, it delivers reliable performance across a wide range of industrial power applications.\u003c\/p\u003e\n\n\u003ch2\u003eLead Wire Configuration\u003c\/h2\u003e\n\u003cp\u003eThe WLCT lead wire is available in four standard lengths: \u003cstrong\u003e0.5m, 1m, 2m, and 3m\u003c\/strong\u003e. The left-end terminal connects to the main device body; the right-end terminal connects to the WLCT-*A three-phase current transformer. Naming convention: *CT*X-0.5 = 0.5m, *CT*X-1 = 1m, *CT*X-2 = 2m, *CT*X-3 = 3m.\u003c\/p\u003e\n\n\u003ch2\u003eExternal Current Transformer Specifications\u003c\/h2\u003e\n\u003cp\u003eSecondary output: \u003cstrong\u003e5A\u003c\/strong\u003e | Protection class: \u003cstrong\u003e5P10\u003c\/strong\u003e | Three units per device\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eRating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCable Aperture\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eZT40-500\/5\u003c\/td\u003e\n\u003ctd\u003e500A\/5A\u003c\/td\u003e\n\u003ctd\u003e250A～500A\u003c\/td\u003e\n\u003ctd\u003e31mm×42mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eZT60-820\/5\u003c\/td\u003e\n\u003ctd\u003e820A\/5A\u003c\/td\u003e\n\u003ctd\u003e410A～820A\u003c\/td\u003e\n\u003ctd\u003e32mm×62mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThree-phase current measurement in a single compact unit\u003c\/li\u003e\n\u003cli\u003e5A standardized secondary output — compatible with standard protection relays and meters\u003c\/li\u003e\n\u003cli\u003e5P10 protection class for reliable fault current detection\u003c\/li\u003e\n\u003cli\u003eFlexible lead lengths (0.5m–3m) for various cabinet configurations\u003c\/li\u003e\n\u003cli\u003eDesigned for use with Wan Long intelligent low-voltage switchgear\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Wan Long Electric Group Co., Ltd.","offers":[{"title":"Default Title","offer_id":43937551876162,"sku":null,"price":99.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/175703526.jpg?v=1783411393"},{"product_id":"zct-zero-sequence-current-transformer","title":"ZCT Zero Sequence Current Transformer","description":"\u003ch2\u003eZCT Zero Sequence Current Transformer\u003c\/h2\u003e\n\u003cp\u003eThe ZCT zero sequence current transformer is an essential accessory for intelligent low-voltage switchgear systems equipped with earth fault or leakage current protection. When the device is configured with a leakage protection function, the ZCT transformer must be installed to enable accurate zero-sequence current detection and protection tripping.\u003c\/p\u003e\n\n\u003ch2\u003eModels \u0026amp; Housing Sizes\u003c\/h2\u003e\n\u003cp\u003eAvailable in three housing sizes and nine models:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZCT46\u003c\/strong\u003e — compact housing for smaller switchgear drawers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZCT80\u003c\/strong\u003e — medium housing for standard configurations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZCT120\u003c\/strong\u003e — large housing for high-capacity applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEach housing size covers multiple current rating options. Refer to the model selection table below to choose the correct specification for your application.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMounting method: \u003cstrong\u003e2-screw fixed installation\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAn epoxy board is placed beneath the transformer to provide electrical isolation from the drawer cabinet\u003c\/li\u003e\n\u003cli\u003eDesigned for straightforward integration into Wan Long intelligent switchgear systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDedicated zero-sequence current detection for earth fault and leakage protection\u003c\/li\u003e\n\u003cli\u003eThree housing sizes (ZCT46 \/ ZCT80 \/ ZCT120) with nine model variants\u003c\/li\u003e\n\u003cli\u003eEpoxy board isolation for enhanced safety and insulation\u003c\/li\u003e\n\u003cli\u003eSimple 2-screw mounting for fast, reliable installation\u003c\/li\u003e\n\u003cli\u003eCompatible with Wan Long intelligent low-voltage switchgear\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Wan Long Electric Group Co., Ltd.","offers":[{"title":"Default Title","offer_id":43937591984194,"sku":null,"price":68.0,"currency_code":"USD","in_stock":false}]},{"product_id":"lzt-residual-current-transformer","title":"LZT Residual Current Transformer","description":"\u003ch2\u003eLZT Residual Current Transformer\u003c\/h2\u003e\n\u003cp\u003eThe LZT residual current transformer is a dedicated accessory for intelligent low-voltage switchgear systems. When the device is configured with a residual current protection function, the LZT transformer must be installed to enable accurate leakage current detection and protection tripping.\u003c\/p\u003e\n\n\u003ch2\u003eModels \u0026amp; Housing Sizes\u003c\/h2\u003e\n\u003cp\u003eAvailable in three housing sizes and three models:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLZT46\u003c\/strong\u003e — compact housing for smaller switchgear drawers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLZT80\u003c\/strong\u003e — medium housing for standard configurations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLZT120\u003c\/strong\u003e — large housing for high-capacity applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRefer to the model selection table below to choose the correct specification for your application.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMounting method: \u003cstrong\u003e2-screw fixed installation\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAn epoxy board is placed beneath the transformer to provide electrical isolation from the drawer cabinet\u003c\/li\u003e\n\u003cli\u003eDesigned for straightforward integration into Wan Long intelligent switchgear systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDedicated residual current detection for leakage protection functions\u003c\/li\u003e\n\u003cli\u003eThree housing sizes (LZT46 \/ LZT80 \/ LZT120) to suit different cabinet configurations\u003c\/li\u003e\n\u003cli\u003eEpoxy board isolation for enhanced safety and insulation\u003c\/li\u003e\n\u003cli\u003eSimple 2-screw mounting for fast, reliable installation\u003c\/li\u003e\n\u003cli\u003eCompatible with Wan Long intelligent low-voltage switchgear\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Wan Long Electric Group Co., Ltd.","offers":[{"title":"Default Title","offer_id":43937677738050,"sku":null,"price":58.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/1_4730ab47-6091-4507-8914-c5acff8fdaf5.jpg?v=1783411800"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/collections\/2_39135ed5-352d-4659-a514-4a1b90947fb4.jpg?v=1783412740","url":"https:\/\/wanlongelectric.com\/collections\/current-transformer.oembed","provider":"Wan Long Electric Group Co., Ltd.","version":"1.0","type":"link"}