The Siemens SIRIUS 3RV1031-4AB10-ZX95 is a motor protection circuit breaker rated for 16 A continuous current and 7.5 kW at 400 V AC-3 duty. The Class 20 trip curve gives it a 20-second thermal memory at 7.2× rated current — standard for general-purpose induction motor starts on pumps, fans, and light conveyors where the acceleration time fits inside that window. Solid conductors up to 2× 16 mm²; stranded up to 2× 25 mm² or a single 35 mm². The 55 mm wide footprint is the standard SIRIUS compact frame — leaves room for a contactor and overload on the same rail section.
Short-circuit breaking capacity varies by line voltage: 100 kA at 240 V AC, 50 kA at 400 V AC, 12 kA at 500 V AC, and 5 kA at 690 V AC. At 400 V — the most common industrial supply in Europe and Asia — 50 kA SCCR covers most panel installations without an upstream current-limiting fuse.
Thermal and Environmental Ratings
Total power dissipation in hot operating state is 14.5 W, or 4.8 W per pole. Front protection is IP20 — suitable for enclosed panels where no one touches live parts. Shock rated at 25 g for 11 ms. Mount in any position.
Compliance Documentation
RoHS compliance date is 2006-07-01, covering the initial EU RoHS directive. The SIRIUS series carries CE marking for the European market and UL/CSA listings for North American installations.