Motor protection circuit breaker, Trip Class 10, 100 kA SCCR
The Siemens SIRIUS 3RV1011-1GA10-ZW98 is a motor protection circuit breaker designed to protect three-phase induction motors against overload, short-circuit, and phase failure. Its Trip Class 10 rating means it will trip within 10 seconds at 7.2× the thermal setting current, which is the standard for standard-duty motor starting — it clears the fault before the motor insulation degrades, but won't nuisance-trip on a normal start. The interrupting capacity is 100 kA at both 240 V and 400 V, so it can be applied on high-fault-capacity industrial networks without requiring upstream current-limiting fuses for most installations. At 690 V the SCCR drops to 2 kA, which still covers the majority of 690 V motor branch circuits. Mounts on 35 mm DIN rail per DIN EN 60715 via screw and snap-on fastening. The 45 mm width matches the standard SIRIUS contactor footprint, so the breaker and contactor can be ganged side-by-side without extra spacing. Any mounting position is permitted.
Sizing and coordination
The 3RV1011-1GA10-ZW98 is rated for motor protection. The screw-type terminals accept 2× (0.5 to 1.5 mm²) solid or stranded, or 2× (0.75 to 2.5 mm²). Phase failure detection is built in — if one phase drops out, the breaker will trip on the unbalance, preventing single-phasing damage to the motor. No ground fault detection is included, so a separate ground-fault relay is needed if that function is required. The required upstream fuse ratings are specified per voltage: at 400 V use gL/gG 50 A, at 500 V and 690 V use gL/gG 40 A. At 240 V no additional fusing is required, relying on the breaker's own 100 kA SCCR.
Lifecycle and compliance
The operating temperature range is -20 to +60 °C, storage and transport -50 to +80 °C. The 75 mm depth and 90 mm height fit standard enclosure depths.