SIRIUS auxiliary contactor relay for control-circuit switching
The Siemens 3RH2122-1TP00-0RA0 is a SIRIUS auxiliary contactor relay in Size S00, configured with 2 NC and 2 NO contacts and a 230 V AC 50/60 Hz coil. It is designed for switching control circuits in motor starter and automation panels, where the contact configuration and coil voltage must match the PLC or relay output driving it.
Contact ratings across the voltage range
The contact current rating varies significantly with the switched voltage: at 24 V it handles 10 A, at 230 V AC it also carries 10 A, but at 600 V the rated current drops to 0.26 A. This derating reflects the arc energy at higher voltages — for a 480 V control circuit the 3 A rating at 400 V is the relevant figure, while a 24 VDC pilot duty stays within the 10 A envelope.
Panel integration and mounting flexibility
The relay measures 73 mm deep by 45 mm wide by 57.5 mm high and mounts via screw or snap-on onto a 35 mm DIN rail. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so it fits into tight enclosures or angled sub-panels without forcing the wiring layout.