What it is and what it does
The Siemens 3RH1122-1AP00-ZW95 is a SIRIUS auxiliary contactor in size S00 — a compact, snap-on module that adds two normally-open (2 NO) instantaneous contacts to a contactor or starter assembly, or stands alone as a signal relay in a control circuit. Rated for 10 A at 24 V and 6 A at 230 V (50/60 Hz), it handles the typical pilot-duty loads on a body-shop weld line — PLC outputs, solenoid valves, indicator lamps — without adding cycle-time jitter. The 6 kV surge voltage resistance (rated value) keeps the contacts from welding under transient spikes common in motor-starter cabinets.
Mounting and panel fit
Mounts via screw or snap-on onto a 35 mm DIN rail; the 45 mm width and 57.5 mm height fit into a standard S00 contactor footprint, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward/backward — useful when retrofitting into a tight gland-plate layout. Depth is 72 mm, so plan for at least 80 mm clearance behind the panel door for wiring access.
Electrical ratings and contact reliability
Contact reliability is spec'd at one incorrect switching operation per 100 million operations at 17 V, 1 mA — deterministic enough for a stop-the-line regime where every cycle counts. Switching capacity drops with voltage: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 1 A at 690 V. For 110 V DC the rating is 1 A; at 220 V DC it's 0.27 A. The AC-1 resistive load curve is what governs for heater or lamp circuits.
Environmental and lifecycle
Operating temperature range is -25 to +60 °C; storage and transport range is -55 to +80 °C. Shock resistance is 10g / 5 ms and 5g / 10 ms — adequate for conveyor and press applications. The lifecycle stage is current production. RoHS compliance date is July 1, 2006. IP20 on the front means the contactor is finger-safe inside an enclosure but not washdown-rated.
Sourcing and availability
For a panel originally specified around the 3RH2122-2AV00, note that the 3RH1122-1AP00-ZW95 carries 2 NO contacts (no NC) and uses the same S00 footprint and DIN-rail clip — no rewiring of the base mounting required, but verify the contact configuration matches your logic.