Siemens 3RU2126-1KC0 (SIRIUS) – Motor Thermal Overload Relay

The Siemens SIRIUS 3RU2126-1KC0 is a motor thermal overload relay designed for use with SIRIUS contactors and motor starter assemblies. It protects motors against overheating and overload by triggering the contactor to disconnect the motor when an overcurrent or thermal condition is detected. Suitable as a replacement unit for 3RU21 series overload relays. Compact design for straightforward installation and wiring within motor control circuits.