{"product_id":"siemens-k36-thermal-overload-heater-elements","title":"Siemens K36 Thermal Overload Heater Element – Class 20 | 4.36–4.99A","description":"\u003cp\u003eThe \u003cstrong\u003eSiemens K36\u003c\/strong\u003e is a precision thermal overload heater element designed for use with Siemens and Furnas Class 20 overload relays. Rated for a motor full-load amperage range of \u003cstrong\u003e4.36 to 4.99 amperes\u003c\/strong\u003e, the K36 heater element provides accurate, thermally-responsive motor protection in single-phase and three-phase applications.\u003c\/p\u003e\n\u003cp\u003eHeater elements like the K36 are installed inside thermal overload relay units and serve as the trip-sensing mechanism — they heat up proportionally to motor current, causing the relay to trip when sustained overcurrent conditions are detected. The K36 is a direct OEM replacement for Siemens\/Furnas motor starters across multiple NEMA sizes.\u003c\/p\u003e\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e K36\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Siemens (Furnas Electric)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElement Type:\u003c\/strong\u003e Thermal Overload Heater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrip Class:\u003c\/strong\u003e Class 20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor FLA Range:\u003c\/strong\u003e 4.36–4.99 Amperes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible NEMA Sizes:\u003c\/strong\u003e 00, 0, 1, 1P, 1-3\/4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Single-phase and three-phase motor protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmbient Temperature Rating:\u003c\/strong\u003e 40°C (104°F)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e UL Listed, CSA Certified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Select the Right Siemens Heater Element\u003c\/h3\u003e\n\u003cp\u003eSelecting the correct Siemens K-series heater element depends on three factors: motor full-load amperage (FLA), starter NEMA size, and motor service factor. Use the Siemens overload relay heater table for your specific starter class and size to confirm the K36 is the right fit:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFor motors with \u003cstrong\u003e1.15–1.25 service factor\u003c\/strong\u003e: use 100% of motor FLA for selection\u003c\/li\u003e\n\u003cli\u003eFor motors with \u003cstrong\u003e1.0 service factor\u003c\/strong\u003e: use 90% of motor FLA and select the next lower heater element\u003c\/li\u003e\n\u003cli\u003eIf motor and controller are in different ambient temperatures, apply the ambient temperature correction multiplier per Siemens heater selection tables\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Choose the Siemens K36?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Accuracy:\u003c\/strong\u003e Factory-calibrated to Siemens trip specifications — ensures reliable Class 20 protection without guesswork.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Starter Compatibility:\u003c\/strong\u003e Works across NEMA Sizes 00, 0, 1, and 1P in Siemens and Furnas motor starters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Replacement:\u003c\/strong\u003e Direct plug-in replacement — no rewiring or panel modification required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCost-Effective Protection:\u003c\/strong\u003e Replacing a worn or mismatched heater element is far less costly than a motor rewind or replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSiemens and Furnas NEMA motor starters (Class 10 and Class 20)\u003c\/li\u003e\n\u003cli\u003eSmall pump and fan motor protection (1\/2 to 2 HP range)\u003c\/li\u003e\n\u003cli\u003eCompressor and conveyor starter panels\u003c\/li\u003e\n\u003cli\u003eHVAC equipment and building automation motor starters\u003c\/li\u003e\n\u003cli\u003eIndustrial process control panels\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility Note\u003c\/h3\u003e\n\u003cp\u003eThe K36 heater element is part of the Siemens K-series heater range. Always reference the official Siemens overload relay heater tables for your specific starter model, class, and enclosure type before ordering. Installing an incorrect heater element can result in nuisance tripping or inadequate motor protection.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"New","offer_id":48395918737656,"sku":"K36-N","price":32.24,"currency_code":"USD","in_stock":true},{"title":"Used","offer_id":48395918770424,"sku":"K36-U","price":32.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/1209\/3176\/files\/shopping_1.webp?v=1779831761","url":"https:\/\/alphabreakersandcontrols.com\/products\/siemens-k36-thermal-overload-heater-elements","provider":"Alpha Breakers \u0026 Controls","version":"1.0","type":"link"}