The Siemens SENTRON 3VA2025-7HM42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection at 25 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. The ETU330 electronic trip unit provides adjustable N-conductor protection (OFF or 100 % of phase rating) and ground-fault monitoring via summation current sensing on L + N — a useful feature for detecting leakage in solidly-grounded systems.
Deployment context
The 4-pole configuration with adjustable neutral protection makes it a natural fit for three-phase four-wire systems (e.g., 400/230 V or 480/277 V) where the neutral conductor needs coordinated overcurrent and ground-fault protection.
