{"product_id":"seki-st-22-automatic-reset-bimetal-thermal-switch","title":"SEKI ST-22 Automatic Reset Bimetal Thermal Switch","description":"\u003ch2\u003eCompact Thermal Protection for Motors and Power Electronics\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSEKI ST-22\u003c\/strong\u003e is a compact automatic-reset bimetal thermal switch designed to protect electrical equipment from overheating. Using a precision snap-action bimetal mechanism, the switch opens the circuit when its calibrated temperature is reached and automatically reconnects once the device has cooled.\u003c\/p\u003e\n\u003cp\u003eIts small footprint, reliable switching performance and sealed construction make it an excellent choice for motors, transformers, LED drivers, battery chargers, power supplies and many other industrial or commercial applications.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"90a86e94-ebe2-40f3-ade6-52112bda87f0\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cp\u003e✔ Quick Despatch Worldwide from the UK\u003cbr\u003e✔ Precision snap-action bimetal mechanism\u003cbr\u003e✔ Available in temperature ratings from 60°C to 100°C\u003cbr\u003e✔ Compact, space-saving design\u003cbr\u003e✔ Suitable for both AC and DC applications\u003cbr\u003e✔ Supplied with 70 mm insulated lead wires\u003cbr\u003e✔ Long operating life and reliable performance\u003cbr\u003e✔ Manufactured to meet international safety standards\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cp\u003eThe ST-22 is widely used to provide over-temperature protection in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eElectric motors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePower transformers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLED drivers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePower supplies\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBattery chargers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSolenoids\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHeating elements\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLighting equipment\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIndustrial control systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOEM electronic products\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eInside the ST-22 is a calibrated bimetal disc that reacts to temperature changes. Under normal operating conditions the contacts are closed, allowing current to flow. When the pre-set temperature is reached, the disc rapidly changes shape, opening the contacts and interrupting the electrical circuit.\u003c\/p\u003e\n\u003cp\u003eAs the device cools below its reset temperature, the contacts automatically close, restoring normal operation without requiring manual intervention.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitch Type\u003c\/td\u003e\n\u003ctd\u003eAutomatic Reset Bimetal Thermal Switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperatures\u003c\/td\u003e\n\u003ctd\u003e50°C to 150°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Increments\u003c\/td\u003e\n\u003ctd\u003e5°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Rating\u003c\/td\u003e\n\u003ctd\u003e7A @ 250VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Rating\u003c\/td\u003e\n\u003ctd\u003eUp to 5A @ 24VDC (application dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReset Differential\u003c\/td\u003e\n\u003ctd\u003eApproximately 30°C (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003eEpoxy-sealed PBT resin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Rating\u003c\/td\u003e\n\u003ctd\u003eIP45\/IP65 depending on installation and version\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard Lead Length\u003c\/td\u003e\n\u003ctd\u003e70 mm XLPE insulated leads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Option\u003c\/td\u003e\n\u003ctd\u003eSurface mounting clip available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eST-22 Thermal Switch Dimensions\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0819\/4496\/9558\/files\/ST-22_Bimetal_thermal_switch.png?v=1783869839\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003ePackage Includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e1 × SEKI ST-22 Automatic Reset Thermal Switch\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eST-22 Thermal protection Approvals\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0819\/4496\/9558\/files\/ST-22_thermal_switch_Safety_approvals.png?v=1783870314\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"SEKI","offers":[{"title":"60°C","offer_id":54526064132438,"sku":null,"price":3.75,"currency_code":"GBP","in_stock":false},{"title":"70°C","offer_id":54526064165206,"sku":null,"price":3.75,"currency_code":"GBP","in_stock":true},{"title":"80°C","offer_id":54526064197974,"sku":null,"price":3.75,"currency_code":"GBP","in_stock":true},{"title":"90°C","offer_id":54526064230742,"sku":null,"price":3.75,"currency_code":"GBP","in_stock":true},{"title":"100°C","offer_id":54526064263510,"sku":null,"price":3.75,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/4496\/9558\/files\/Thermal_Switch_60C.jpg?v=1784757021","url":"https:\/\/onlinesensors.store\/products\/seki-st-22-automatic-reset-bimetal-thermal-switch","provider":"OnlineSensors Store","version":"1.0","type":"link"}