Motor Protection Circuit Breaker — 3.2 A, Class 10, 100 kA
The Siemens SIRIUS 3RV1021-1DA10-ZW95 is a 3-pole motor protection circuit breaker rated for a continuous current of 3.2 A, with a Class 10 trip characteristic — meaning it will trip within 10 seconds at 7.2× the thermal setting, matching the startup profile of standard induction motors up to 1.1 kW at 400 V. Breaking capacity is 100 kA at 400 V AC, which covers most industrial distribution fault levels without needing an upstream current-limiting fuse. Phase failure detection is built in — if one phase drops, the breaker trips faster than a standard thermal-only device, protecting the motor from single-phasing.
Mounting and Wiring
Snaps onto 35 mm DIN rail per EN 50022; screw-type terminals on both main and auxiliary circuits accept 1 to 2.5 mm² solid or stranded (two conductors per clamp) or 2.5 to 6 mm² for larger feeds. Dimensions are 45 mm wide, 97 mm high, 96 mm deep — fits a standard 45 mm module slot on the rail, with zero clearance needed at the sides or rear. Mounting position is any orientation; operating temperature range is -20 to +60 °C, storage from -50 to +80 °C.
Lifecycle and Sourcing
RoHS compliance date is 01.05.2012; the product carries IP20 protection on the front face, suitable for enclosed panel mounting.
Key Ratings at a Glance
Rated insulation voltage 690 V; surge voltage resistance 6 kV. Maximum operating frequency in AC-3 duty is 15 operations per hour. Power loss per pole in hot operating state is 2.4 W, total 7.25 W — factor into enclosure thermal calculations. Shock resistance rated at 25g for 11 ms; auxiliary switch extension is supported.