The Siemens SIRIUS 3RH1921-1CA10-ZW97 is a snap-on auxiliary switch designed for S0-size contactor relays and power contactors. It carries one normally-open instantaneous contact rated 10 A at 24 V, with additional AC-15 ratings up to 1 A at 690 V and AC-12 maximum 10 A. The contact is a mirror contact per IEC 60947-4-1 when used with 3RT1 contactors, providing a mechanically linked confirmation of the main contact position for safety circuits.
Snaps onto the front of S0 contactors via the fastening method — no tools needed for installation. Dimensions are 10 mm wide, 38 mm high, 51 mm deep, fitting within the standard S0 footprint.
Rated operational currents span multiple voltages: 6 A at 24 V and 230 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V and 250 V, and 3 A at 400 V. The AC-15 rating at 690 V is 1 A, covering inductive loads typical of contactor coils and solenoid valves. AC-12 maximum is 10 A for resistive loads.
Listed as current production. RoHS compliance date is 07/01/2006. Wire connection accepts 2x (0.5 to 1.5 mm²) solid/stranded or 2x (0.75 to 2.5 mm²) finely stranded with ferrule, plus AWG equivalents 20–16 and 18–14.