Siemens 3RB2036-1UB0 Thermal Overload Relay for Motor Protection

The Siemens 3RB2036-1UB0 Thermal Overload Relay is a SIRIUS 3RB20 motor protection device designed to guard electric motors against overload and phase failure in industrial automation, commonly used in motor control centers, pump systems, conveyors, and compressors. It offers an adjustable current range of 20–80 A, a Class 10 trip, direct mounting on a contactor or panel, and a selectable reset mode (manual or automatic), with 1 NO + 1 NC auxiliary contacts, phase-failure sensitivity, screw terminals, and IEC 60947-4-1 compliance, operating from -20°C to +60°C. Common replacement references include Siemens 3RU2136-1HB0, 3RB2046-1UB0, and 3RB2036-1TB0.