{"product_id":"a2-57-schneider-electric-square-d-overload-relay-thermal-unit","title":"A2.57 - Schneider Electric - Square D Overload Relay Thermal Unit","description":"\u003ch2\u003e\u003cspan\u003eA2.57 - Schneider Electric - Square D Overload Relay Thermal Unit\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThermal units are intended to protect motors, controllers, and branch circuit conductors against excessive heating due to prolonged motor over currents up to and including locked rotor currents. Protection of the motor and the other branch circuit components from higher currents, due to short circuits or grounds, is a function of the branch circuit fuses or circuit breakers. Class 20 thermal units respond to overload current conditions according to trip curves. These thermal units will trip in 20 seconds or less on overload conditions. The proper thermal unit is selected using the motor full load current and a selection table. These thermal units have a one piece construction. The motor current passes through a small heater winding within these thermal units. Under overload conditions, the heat causes a special solder to melt allowing a ratchet wheel to spin free thus opening the control circuit contacts and opening the motor contacts.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eGENERAL SPECIFICATIONS\u003cbr\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable class=\"specifications-table\"\u003e\n\u003ccaption class=\"specifications-table__caption\"\u003eMain\u003c\/caption\u003e\n\u003ctbody\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003eRange of Product\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003eA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003eThermal overload type\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003eMelting alloy\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003eMotor tripping class\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003e20\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable class=\"specifications-table\"\u003e\n\u003ccaption class=\"specifications-table__caption\"\u003eOrdering and shipping details\u003c\/caption\u003e\n\u003ctbody\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003eCategory\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003eUS10CP121781\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003eDiscount Schedule\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003e0CP1\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003eGTIN\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003e785901585282\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003eReturnability\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003eYes\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003eCountry of origin\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003eUS\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable class=\"specifications-table\"\u003e\n\u003ccaption class=\"specifications-table__caption\"\u003ePacking Units\u003c\/caption\u003e\n\u003ctbody\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003eUnit Type of Package 1\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003ePCE\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003eNumber of Units in Package 1\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003e1\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003ePackage 1 Height\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003e0.79 in (2.0 cm)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003ePackage 1 Width\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003e1.10 in (2.8 cm)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003ePackage 1 Length\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003e2.28 in (5.8 cm)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"specifications-table__row\"\u003e\n\u003cth class=\"specifications-table__row-heading\"\u003ePackage 1 Weight\u003c\/th\u003e\n\u003ctd class=\"specifications-table__cell\"\u003e\u003cspan class=\"specifications-table__text specifications-table__text--first-letter-uppercase\"\u003e0.8 oz (22.7 g)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003ePRODUCT DATASHEET\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003ca title=\"A2.57_Product Datasheet\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0711\/9873\/6657\/files\/A2.57_Product_Datasheet_49ebe71c-650a-46f6-99fd-deb1e8c5c5b4.pdf?v=1747822728\"\u003eA2.57_Product Datasheet\u003c\/a\u003e\u003c\/p\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":51552136266001,"sku":"SQDA2.57","price":35.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0711\/9873\/6657\/files\/files_20b650ce-fd82-449f-8f5d-cd1272e06f2c.jpg?v=1747655861","url":"https:\/\/breakersnow.com\/products\/a2-57-schneider-electric-square-d-overload-relay-thermal-unit","provider":"Breakers Now","version":"1.0","type":"link"}