Motor protection circuit breaker, SIRIUS, 6.3 A, 100 kA
The Siemens SIRIUS 3RV2011-1GA25-ZW96 is a motor protection circuit breaker designed for protecting induction motors against overload and short-circuit faults. It carries a rated current of 6.3 A at both 480 V and 600 V, with a massive 100 kA breaking capacity at 400 V — meaning it can safely interrupt fault currents up to that level without cascading damage upstream in the panel. Trip Class 10 means it trips within 10 seconds at 7.2× the thermal setting, matching standard IEC starting profiles for squirrel-cage motors. Phase failure detection is built in, so a lost phase on the line side will trip the breaker — no separate phase-loss relay needed.
Mounting and integration
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. At 45 mm wide, it fits standard 45 mm slot spacing in most motor control centers. Depth is 97 mm, height 106 mm. Clearance requirements: 50 mm upward, 50 mm downward, 30 mm at the side, and 0 mm forward/backward — meaning you can pack it tight front-to-back, but leave breathing room above and below. Spring-loaded terminals on the main circuit accept 2× (0.5 to 2.5 mm²) solid or stranded conductors. No screw torque to verify — just strip, insert, and latch. Mounting position is any, so vertical or horizontal rail orientation works.
Short-circuit and auxiliary contact ratings
Short-circuit breaking capacity varies with voltage: 100 kA at 240 V, 400 V, and 500 V; 4 kA at 690 V. At 400 V and 500 V, the rating assumes upstream gL/gG fuses sized at 50 A and 40 A respectively; at 690 V, a 35 A gL/gG fuse is required. That 100 kA figure at 400 V is the key number for most industrial 400 V distribution — it's a high-fault rating that handles strong utility feeds. Auxiliary contact (integrated into the ZW96 variant) switches: 1 A at 24 V, 0.15 A at 60 V, 0.5 A at 120/125/230 V. These are the dry-contact ratings for the signal circuit — the 0.5 A at 120 V is typical for PLC input modules.
Environmental and lifecycle
Operating temperature range -20 to +60 °C; storage and transport -50 to +80 °C. The product lifecycle stage is current — meaning this is an active, in-production catalog item, not a phase-out or NRND part. No last-time-buy concerns; it's a standard BOM line.