The Siemens 3RV1021-0DA15 is a SIRIUS motor protection circuit breaker sized for a 0.32 A continuous current, making it the right fit for protecting a small motor or transformer winding against overload and short circuit. The CLASS 10 trip characteristic means it will trip within 10 seconds at 7.2× rated current — fast enough to protect a motor during start-up without nuisance tripping on normal inrush.
Breaking capacity and fault clearing
Rated breaking capacity hits 100 kA across the full AC range from 240 V to 690 V. That is a high-interrupting rating for a 45 mm wide device — it can clear a bolted fault on a 100 kA available fault-current bus without needing an upstream current-limiting fuse. The 100 kA at 400 V is the number to check against your panel's SCCR label.
Mounting and panel fit
Mounts via screw fixing or snaps onto a 35 mm DIN rail per DIN EN 50022. The 45 mm width and 97 mm height fit a standard motor-starter row. Any mounting position is allowed, and zero clearance is required at the sides or rear — you can pack these tight in a panel without derating for airflow.
Auxiliary contacts and control signals
The auxiliary switch is a transverse design, rated 1 A at 24 V, 0.5 A at 230 V, and 0.15 A at 60 V. These are the contact ratings for the signal side — feeding a PLC input or a contactor coil. The main circuit terminals accept solid conductors from 0.5 to 2.5 mm² and stranded from 1 to 6 mm², using screw-type terminals on both main and auxiliary circuits.
Sourcing note
This is a current-production Siemens SIRIUS part, sourced through independent distribution channels. Availability and current pricing are confirmed at quote time against an RFQ.