Motor protection circuit breaker for 35 mm DIN rail
The Siemens 3RV2021-1GA10-ZX95 is a SIRIUS motor protection circuit breaker designed for Class 10 trip response, meaning it disconnects within 10 seconds at 7.2× the thermal setting — the standard for protecting standard induction motors during locked-rotor starts. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, with a 45 mm width that fits a standard 2.5-module slot in most panel layouts. Rated breaking capacity hits 100 kA at 400 V AC, so it can interrupt high-fault-current events without cascading upstream — critical for panels fed by large transformers or close to the service entrance.
Trip Class 10 and phase-loss protection
Class 10 trip characteristic matches the thermal curve of most IEC standard motors up to about 15 hp at 460/480 V. The built-in phase failure detection trips the breaker if one phase drops out, preventing single-phasing damage on delta-connected loads. Mounting position is any orientation, and the 97 mm depth leaves clearance for wiring ducts behind the rail — no need to oversize the enclosure for this device alone.
Current production — sourcing posture
Lifecycle stage is listed as current production, so this is not a last-time-buy or end-of-life part. It remains a standard catalog item in the SIRIUS 3RV2 family.