3RU1126-1CB0

The 3RU1126-1CB0 is a thermal overload relay from Siemens' SIRIUS 3RU1 series, engineered to provide ambient-compensated bimetallic protection against phase failure, current overload, and single-phasing for three-phase electric motors. Designed for direct mounting onto Size S0 contactors or standalone panel installation, this protective relay operates across power circuits rated up to . Electrically, the 3RU1126-1CB0 features an adjustable current setting range of to match specific motor full-load currents (FLA). Operating with Class 10 tripping characteristics, it utilizes temperature-compensated bimetallic elements to monitor phase balance and disconnect power before damaging thermal conditions build up inside motor windings. Integrated 1NO + 1NC auxiliary contacts provide dedicated fault signaling to control devices and isolate the main contactor coil circuit during a trip event. Mechanically, the 3RU1126-1CB0 is housed in a compact, flame-retardant Size S0 enclosure equipped with touch-safe IP20 screw terminals for main power and auxiliary connections. It includes a multi-function front control interface featuring a blue manual/automatic RESET selector, a RED STOP button, a TEST button for auxiliary contact verification, and a clear protective seal for the current adjustment dial to prevent unauthorized setting changes. Purchase the 3RU1126-1CB0 at Electrical.com, your reliable partner for industrial and commercial electrical products. Our selection includes trusted thermal overload relays, magnetic contactors, and motor protection accessories from top manufacturers like Siemens, Eaton, Cutler-Hammer, and Schneider Electric, backed by a knowledgeable sales team ready to assist with technical questions, product selection, and support.