The Siemens SENTRON 3VA2225-5HL32-0KA0 is a 3-pole molded case circuit breaker rated for 250 A continuous current (Iu) at 40 °C, with the ETU320 electronic trip unit configured for line protection.
Full 250 A holds through 50 °C ambient. At 55 °C it derates to 241 A, at 60 °C to 232 A, at 65 °C to 222 A, and at 70 °C to 213 A. The maximum power loss is 48 W, which matters for enclosure heat rise calculations when grouping several breakers.
Trip unit and auxiliary release configuration
The ETU320 overcurrent release provides electronic trip curves for line protection — no ground-fault monitoring, no phase-failure detection, no communication module. The shunt trip (STL) is built in for remote tripping; the integrated auxiliary trip is order code 3VA9688-0BL33. No auxiliary contact version is fitted, and there is no undervoltage release. The supplied basic switch is 3VA2225-5HL32-0AA0.
Environmental limits and endurance
The latching endurance is rated at 20 000 operations — adequate for distribution duty where the breaker is not cycled daily.
