SIRIUS 3RV2011-1CA25-ZX95 — Motor Protection Circuit Breaker
The Siemens 3RV2011-1CA25-ZX95 is a SIRIUS series motor protection circuit breaker, designed for motor protection with phase failure detection and Trip Class 10. It mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 60715, in any position — clean panel integration. The breaker is rated for a gL/gG fuse backup at 25 A at 400 V and 500 V, and 20 A at 690 V. With a short-circuit breaking capacity of 100 kA at 400 V and 10 kA at 690 V, it safely interrupts faults up to those levels without cascading upstream — no exceptions. Trip Class 10 means it clears a locked-rotor condition within 10 seconds at 7.2× rated current — fast enough to protect standard induction motors from thermal damage during start-up stall. The phase failure detection trips the breaker when one phase drops out, preventing single-phasing motor burnout. Ground fault detection is not built in, so downstream GFCI or RCD is required for personnel protection. The breaker accepts spring-loaded terminals for the main current circuit, accepting 2× 0.5 to 2.5 mm² solid or stranded conductors. Temperature compensation is active across the -20 to +60 °C operating range, so the trip curve stays accurate in a warm enclosure.
Coordination and Clearances
Minimum clearances for safe operation: 50 mm upwards and downwards, 30 mm at the side, 0 mm forwards and backwards — the breaker can be mounted flush against a backplane. The 97 mm depth and 45 mm width fit standard DIN-rail footprints.