The Siemens 3RU2126-4CB0 is a SIRIUS thermal overload relay with CLASS 10 trip protection, rated for 690 V and mounted directly on a contactor. CLASS 10 trip class. S0 frame size. Screw terminals accept 2x 0.5…1.5 mm² solid or 2x 0.75…2.5 mm² stranded. Torque with PZ2 bit. Mount in any position; the relay fastens to the contactor via M4 screws.
The built-in auxiliary switch signals a tripped condition — the part carries a 'Note for message Tripped' in its documentation, so you get a positive indication on fault. Ambient operating range -40…+70°C with temperature compensation active to +60°C. Storage and transport hold -55…+80°C. Dimensions: 85 mm deep, 45 mm wide, 85 mm high. Fits standard 45 mm DIN space when coupled to the contactor.
Substance prohibitance date 10/01/2009.