The Siemens 3RV1011-1AA20 is a SIRIUS motor protection circuit breaker rated for 1.6 A continuous current, designed to protect three-phase motors up to 0.55 kW at 400 V AC. No ground-fault detection here, so plan for a separate ground-fault relay if that's required. The 3-pole design handles the three-phase main circuit; spring-loaded terminals on both main and auxiliary circuits accept 0.25–2.5 mm² solid or 0.25–1.5 mm² finely stranded with ferrules. Dimensions are 45 mm wide, 90 mm high, 81 mm deep — zero clearance needed at the sides or rear.
At 690 V AC it drops to 2 kA — that's the limit for 690 V systems; above that voltage, coordination with upstream protection is essential. For typical 400 V distribution panels, the 100 kA rating gives plenty of headroom for high-fault installations.
Power Loss and Duty Cycle
Total power loss in hot operating state is 7.25 W, with 2.4 W per pole. That's modest — no special ventilation needed in a standard enclosure. Maximum operating frequency at AC-3 duty is 15 operations per hour, which suits typical motor start cycles for pumps, fans, and conveyors. For higher cycling applications like rapid reversing drives, consider a contactor with a higher rated frequency.