Motor protection circuit breaker, SIRIUS series
The Siemens SIRIUS 3RV2011-0GA15-ZX95 is a motor protection circuit breaker designed for the main current circuit of a motor branch. It is a current-production part, still in the active catalog. Rated Trip Class 10, so it coordinates with standard motor starting profiles — the bimetal trip element allows up to 10 seconds at locked-rotor current before opening. Phase failure detection is built in, which means the breaker will trip if one phase drops out, protecting the motor from single-phasing. Breaking capacity is 100 kA at 400 V, 500 V, and 690 V — that's the fault current it can safely interrupt without welding contacts or rupturing the case. At 240 V it's also 100 kA. The high interrupting rating suits it for installations with large upstream transformers or high available fault current. Rated operational voltage spans 20 to 690 V AC. The motor power rating at 230 V is 0.1 kW. The auxiliary contact ratings: 1 A at 24 V, 0.5 A at 120 V, 0.5 A at 230 V. At 690 V the fuse backup is gL/gG 6 A. Mounts on 35 mm DIN rail per EN 60715, either screw-fastened or snap-on. The 45 mm width takes one standard modular device position. Mounting position is any orientation. Clearance requirements: 50 mm above and below, 30 mm at the sides, 0 mm forward and backward — so it can be stacked tight front-to-back in a deep enclosure.
Panel integration and wiring
Main circuit terminals are screw-type, accepting 2 x 0.5 to 1.5 mm² solid or stranded, or 2 x 0.75 to 2.5 mm². The main contact screws are M3. The operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C. Maximum switching frequency in AC-3 duty (motor starting) is 15 operations per hour; same for AC-3e. That's typical for a motor-protective device — not a contactor for high-cycle applications. No ground-fault detection on this variant. If ground-fault protection is needed for the motor branch, it must be added externally.