The Siemens 3RH1122-1AF00-ZX95 is a SIRIUS auxiliary contactor in the compact S00 frame size, delivering two normally-open instantaneous contacts for control-circuit switching in motor starter and relay logic applications. It carries a 10 A rated current at 24 V and switches up to 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V — covering the common control voltages across 50/60 Hz systems. The 2 NO configuration (no NC, no delayed or leading/lagging contacts) makes it a straightforward pick for adding a single set of auxiliary contacts to a contactor or for standalone interposing relay duty.
Mounting and integration
Mounts via screw or snap-on onto a DIN rail. The 45 mm width and 57.5 mm height fit the S00 footprint shared across the SIRIUS contactor family, so it aligns mechanically with a 3RT2 contactor of the same frame. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward — useful when panel layout forces an unconventional orientation. IP20 on the front face means it is protected against finger contact but not washdown; keep it inside an enclosure rated for the environment.
Electrical ratings and contact reliability
Rated surge voltage resistance is 6 kV, which aligns with basic insulation coordination for 400 VAC control circuits in pollution degree 3 environments. Mechanical endurance is rated at 30 million switching cycles typical. Contact reliability is specified as one incorrect switching operation per 100 million operations at 17 V, 1 mA — a meaningful figure for PLC-level signal switching where dry-contact reliability matters. The auxiliary switch block is field-extendable (Product Extension Auxiliary Switch = Yes), so additional contact blocks can be ganged on if the 2 NO count needs to grow later.