Motor Protection Circuit Breaker, 3.2 A, 100 kA — SIRIUS 3RV1021-1DA10-ZW97
The Siemens 3RV1021-1DA10-ZW97 is a SIRIUS motor protection circuit breaker rated for 3.2 A continuous current, with a 100 kA breaking capacity at 400 V AC — enough to handle high-fault-current industrial panels without cascading upstream. It carries a Class 10 trip curve, meaning it will disconnect within 10 seconds at 7.2× rated current, which is the standard for protecting standard induction motors during a locked-rotor event. Rated insulation voltage is 690 V, and it detects phase failure — a common cause of single-phasing motor burnout. The unit screws onto a 35 mm DIN rail (DIN EN 50022) and can be mounted in any position, which simplifies panel layout.
Breaking Capacity and Coordination
At 400 V and 500 V, the 100 kA breaking capacity is the same — no derating needed across the common industrial voltage band. At 690 V it drops to 8 kA, so if your panel runs at 690 V, verify the available fault current stays under that ceiling. The 100 kA figure at 400 V means this breaker can be used at the main distribution point in most low-voltage networks without needing a current-limiting upstream device.
Terminal and Wiring Details
Main and auxiliary/control circuits use screw-type terminals. Solid and stranded conductors are accepted: 2× (1 … 2.5 mm²) and 2× (2.5 … 6 mm²), with the same range for finely stranded wire with ferrule. AWG equivalents are 2× (14 … 10). The front face is IP20 — protected against finger contact, but not against moisture ingress, so keep it inside the enclosure.
Environmental and Compliance
Operating temperature range is -20 to +60 °C; storage and transport extend from -50 to +80 °C. Shock resistance is 25 g for 11 ms. The product carries a substance prohibitance date of 01.05.2012, consistent with RoHS compliance. No ground fault detection is built in — that is handled separately downstream if needed.