The Siemens 3RV6901-1F is a SIRIUS transverse auxiliary switch — a bolt-on accessory that adds two normally-open (2 NO) instantaneous contacts to a circuit breaker. It mounts on the front of the breaker using plug-in fixing and connects via screw-type terminals, accepting solid or stranded wire from 0.5 to 2.5 mm² (two conductors per terminal). Rated for 1 A at 24 V and 0.5 A at 230 V, these contacts handle typical control and signaling loads — PLC inputs, contactor coils, indicator lamps — not motor power. The 2 NO configuration gives you a clean pair of form-A contacts for status feedback or enable circuits.
This switch is sized for the SIRIUS 3RV2 breaker family, fitting frame sizes S00, S0, S2, and S3. The 45 mm width matches the breaker's footprint; overall depth is only 17 mm, so it adds minimal projection inside the enclosure. Height is 12 mm. Terminals accept two conductors per clamp: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid/stranded, or 2x AWG 20 to 14. The screw-type connection is standard for panel wiring — no special tooling needed.