Motor-protection circuit breaker, SIRIUS, size S00
The Siemens 3RV2011-0GA20-ZX95 is a SIRIUS motor-protection circuit breaker in the size S00 frame, designed for direct motor starting duty. It carries a Trip Class 10 — meaning it will trip within 10 seconds at 7.2× the thermal setting, fast enough to protect standard induction motors against locked-rotor heating. Rated breaking capacity hits 100 kA at 400 V AC, so it can interrupt a bolted fault on a high-capacity distribution board without needing an upstream fuse for SCCR compliance. Phase failure detection is built in; ground fault detection is not — this is a thermal-magnetic motor protector, not a GFP device.
Mounting and wiring
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. The size S00 footprint is 45 mm wide, 97 mm deep, 106 mm tall — fits the standard panel slot for this frame class. Spring-loaded terminals on the main circuit accept 2×(0.5–4 mm²) solid or stranded. Clearances: 50 mm above and below, 30 mm to the side, zero forward or backward — tight panel layout is fine as long as vertical breathing space is maintained. Any mounting position is allowed.
Electrical ratings and coordination
Rated operational voltage spans 20 to 690 V. At 230 V the motor rating is 0.1 kW; at 480 V and 600 V the setting range drops to 0.63 A — this is a low-current variant for fractional-horsepower motors or small transformer primary protection. The maximum back-up fuse is gL/gG 6 A at 690 V. With 100 kA SCCR at 240, 400, 500, and 690 V AC, it coordinates cleanly with most downstream contactors without separate current-limiting fuses. For comparison to the 3RV2011-0BA20: both are size S00 Class 10 breakers, but the -0BA20 carries a higher current setting range and lacks the spring-terminal variant — the -0GA20-ZX95 is the spring-terminal version with a narrower adjustment band. If your panel was wired for the -0BA20 with screw terminals, the -0GA20 will fit the same DIN rail footprint but you will need to adapt the conductor termination method.