The Siemens SENTRON 3VA1225-6EF32-0HC0 is a 3-pole molded case circuit breaker rated for line protection, carrying a continuous current of 250 A up to 50 °C ambient before the thermal derating curve begins to step down — 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. Breaking capacity climbs with voltage: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V.
This variant ships with a factory-installed shunt trip (STL) release and two HQ auxiliary switches. The shunt trip lets a remote signal — from a fire alarm relay, emergency-stop contactor, or PLC output — trip the breaker electrically without an operator reaching the handle. The two auxiliary switches give you position feedback (open/closed) for status monitoring or interlocking. No undervoltage release, no ground-fault module, no communication function on this order code; if you need those, you are looking at a different 3VA suffix. The 70 mm depth keeps it clear of most gland plates and cable troughs.