The Siemens 3RH2122-1AC60 is a SIRIUS auxiliary contactor in size S00, carrying 2 instantaneous normally open contacts. It's the switching-signal side of a contactor or motor-starter assembly — the contacts follow the main contactor armature, giving you a clean NO signal for PLC inputs, status lamps, or interlocking another device in the panel. Rated operational currents span the common control voltages: 10 A at 24 V AC/DC and at 230 V, 4.7 A at 60 V, 3 A at 110 V and at 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. That covers most panel voltages you'll find in IEC-marketed gear.
The S00 footprint is 45 mm wide, 57.5 mm tall, 73 mm deep — fits the same slot as any S00 contactor or relay in the SIRIUS family. Terminals accept 2 x (0.5…1.5 mm²), 2 x (0.75…2.5 mm²), or 2 x 4 mm² solid or stranded copper. That's enough for standard control-circuit wiring in a panel — no need for special ferrules or oversized lugs.
The part carries a substance prohibition date of 10/01/2009, aligning with early RoHS compliance.