What it is and where it fits
The Siemens SIRIUS 3RH2122-1BN40-0AA6 is an auxiliary contactor in the S00 frame size, carrying two normally-open instantaneous contacts. It is designed to switch control and signalling circuits in motor starter assemblies, typically mounted on a 35 mm DIN rail alongside the main contactor. Rated operational current varies with voltage: 10 A at 24 V and 230 V, 4.7 A at 60 V, 3 A at 110 V and 400 V, 1.2 A at 220 V, 2 A at 500 V, 1 A at 690 V, 0.5 A at 440 V, and 0.26 A at 600 V. The coil draws 4 W DC both for closing and holding.
Panel integration and mounting
Mounts via screw and snap-on onto a 35 mm standard mounting rail. The mounting position allows ±180° rotation on a vertical surface and ±22.5° forward/backward tilt. Clearances: 10 mm upwards, forwards, and downwards; 6 mm at the side. Dimensions are 45 mm wide, 57.5 mm high, 73 mm deep. Terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded wire. Pollution degree 3 rating suits industrial environments with conductive pollution.
Lifecycle and sourcing
Compliance includes RoHS substance prohibitance dated October 1, 2009.