Siemens SIRIUS 3RV2901-2E-ZX90 — transverse auxiliary switch for 3RV2 breakers
The Siemens SIRIUS 3RV2901-2E-ZX90 is a transverse front-mounted auxiliary switch designed for the 3RV2 series of circuit breakers (sizes S00, S0, S2, S3). It provides 1 normally open (NO) and 1 normally closed (NC) instantaneous contact, wired through spring-loaded terminals that accept 2x (0.5... 2.5 mm²) solid or stranded conductors, or 2x (20... 14) AWG for auxiliary contacts. Rated at 1 A at 24 V, 0.5 A at 230 V, and 0.3 A at 48 V, with an AC-12 maximum operational current of 2.5 A, this switch handles the typical control-circuit loads found in motor starter and distribution panels — signaling contactor status, driving PLC inputs, or interlocking safety circuits. The 17 mm depth and 45 mm width keep the assembly compact inside a DIN-rail enclosure.
Fit and integration — spring-clamp wiring on a 45 mm footprint
Mounts via plug-in fixing directly onto the front of a 3RV2 circuit breaker. The spring-loaded terminals accept 0.5 to 2.5 mm² solid or stranded, or 0.5 to 1.5 mm² finely stranded with or without ferrule. Because this is a transverse auxiliary switch, it sits on the front face of the breaker rather than stacking on the side. That means the overall depth stays at 17 mm — useful when panel depth is tight. The 1 NO + 1 NC contact arrangement covers the common feedback pair: one contact for the run signal (NO) and one for the fault/trip signal (NC).
Lifecycle and sourcing — active production, multi-unit packaging
The part is a transverse auxiliary switch in the SIRIUS family. No end-of-life notice is on record.
Compliance and environmental data
The product carries a substance prohibitance date of 05/28/2009, indicating RoHS compliance for the EU directive. The spring-loaded terminal design supports quick field wiring changes without special tools.