Motor protection circuit breaker for Class 10 coordination
The Siemens 3RV2021-1HA10-ZX95 is a SIRIUS motor protection circuit breaker designed for motor branch circuits. Its Class 10 trip characteristic means it will open within 10 seconds at 7.2× the thermal setting, matching the startup profile of standard induction motors — critical for preventing nuisance tripping during across-the-line starts while still protecting against locked-rotor conditions. Rated interrupting capacity reaches 100 kA at both 240 V and 400 V AC, so it can be applied on high-fault-capacity distribution panels without requiring upstream current-limiting fuses. Phase failure detection is built in, which protects three-phase motors from single-phasing damage. Mounts via screw or snap-on to 35 mm DIN rail per DIN EN 60715, in any position. The 45 mm width matches the standard SIRIUS compact frame, leaving room for auxiliary contact blocks or a separate contactor alongside in the same panel row.
Sourcing and lifecycle
For a panel originally specified around the 3RV2021-1GA15, the 3RV2021-1HA10-ZX95 shares the same 45 mm footprint and DIN-rail mounting, so it drops in without rewiring or enclosure modifications. The functional difference is in the trip setting range and interrupting ratings — verify those against your motor FLA before substituting.
Integration note
Screw-type terminals on the main circuit accept 2x (1–2.5 mm²) solid/stranded or 2x (2.5–10 mm²). The M4 contact screws are standard for panel wiring. Ambient operating range is -20 to +60 °C; storage and transport tolerate -50 to +80 °C. Clearance: 50 mm above and below, 30 mm at the sides, zero forward/backward — typical for a SIRIUS breaker in a multi-row enclosure.