The Siemens SIRIUS 3RV2901-2E-ZX95 is a transverse auxiliary switch — 1 NO + 1 NC — with spring-loaded terminals, designed to clip onto the front of SIRIUS circuit breakers in sizes S00, S0, S2, and S3. It carries a maximum switching current of 2.5 A, with voltage-specific ratings: 1 A at 24 V, 0.3 A at 48 V, 0.15 A at 60 V, and 0.5 A at 230 V.
Fastens via plug-in fixing — no DIN rail required, it snaps directly onto the breaker's front. The spring-loaded terminals accept solid or stranded conductors: 2x (0.5... 2.5 mm²) solid, or 2x (0.5... 1.5 mm²) with core-end processing. AWG range for auxiliary contacts is 2x (20... 14). Overall dimensions: 45 mm wide, 13 mm high, 17 mm deep — negligible footprint on the breaker face.