Motor protection circuit breaker — 4 A, CLASS 10, 100 kA SCCR
The Siemens 3RV1021-1EA15-ZW98 is a SIRIUS motor protection circuit breaker rated for 4 A continuous current with a CLASS 10 trip characteristic, designed for screw and snap-on mounting onto 35 mm DIN rail per EN 50022. Its short-circuit breaking capacity reaches 100 kA at 240 V, 400 V, and 500 V AC, dropping to 6 kA at 690 V AC — sufficient for most industrial distribution panels where the available fault current stays under 100 kA at 400 V. The motor rating at 400 V is 1.5 kW, making this a fit for small three-phase induction motors on pumps, fans, or conveyors where the full-load current sits at or below 4 A.
Trip class and thermal behaviour
CLASS 10 means the bimetal trip opens within 10 seconds at 7.2× the current setting — standard for standard-duty motor starting where the acceleration time is under 10 seconds. For longer ramp times (high-inertia loads), a CLASS 20 or CLASS 30 trip would be needed. Power dissipation at rated current in hot operating state is 7.25 W, which factors into enclosure thermal budgeting when multiple breakers are ganged in a panel. Phase failure detection is built in; ground fault detection is not present on this variant.
Mounting and wiring
Mounts on 35 mm DIN rail per DIN EN 50022 via screw and snap-on; mounting position is any orientation. Clearance: 0 mm backwards, 0 mm at the sides — no additional air gap required for adjacent units. Main circuit terminals are screw-type, accepting solid conductors of 2× (0.5…1.5 mm²) and 2× (0.75…2.5 mm²), and stranded conductors of 2× (1…2.5 mm²) and 2× (2.5…6 mm²). The auxiliary switch is transverse design with 0 built-in auxiliary contacts; an add-on block is required if signalling the breaker state is needed.
Environmental and mechanical ratings
Operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C. Maximum operating altitude is 2 000 m without derating. Shock resistance is 25 g for 11 ms; front face protection is IP20 — suitable for enclosed panel mounting, not for washdown environments. Mechanical endurance of the main contacts is 100 000 operations typical; maximum switching rate at AC-3 is 15 operations per hour.