The Siemens 3RV2901-2F is a SIRIUS auxiliary switch designed for transverse mounting on the front of 3RV2 circuit breakers in frame sizes S00, S0, S2, and S3. It provides two normally open (NO) instantaneous contacts, with spring-loaded terminals for the auxiliary and control circuit connections. Rated switching capacity varies by voltage: 1 A at 24 V, 0.3 A at 48 V, 0.15 A at 60 V, and 0.5 A at 230 V. The AC-12 maximum operational current is 2.5 A. These ratings define the maximum load the contacts can break under the respective conditions — useful for sizing the control circuit load, not the main power path. The spring-loaded terminals accept solid or stranded conductors from 0.5 to 2.5 mm² (2x 0.5...2.5 mm² solid, 2x 0.5...1.5 mm² finely stranded with or without ferrule). AWG equivalents are 20 to 14 for the auxiliary contacts. The 17 mm depth and 45 mm width match the breaker's front profile — no extra DIN rail space required beyond the breaker itself.
Integration Notes
Mounts via plug-in fixing directly onto the front of the 3RV2 circuit breaker — no separate DIN rail footprint. The transverse orientation places the two NO contacts on the side of the breaker, accessible for wiring without removing the breaker from the panel. The part is RoHS-compliant per the substance prohibitance date of October 1, 2009.