What this MCCB delivers for your line
The Siemens SENTRON 3VA2225-6HL32-0BA0 is a 3-pole molded case circuit breaker rated for 250 A continuous current, with a breaking capacity of 242 kA at 240 V — enough to handle high-fault utility feeds or large transformer secondaries without cascading upstream. The ETU320 electronic overcurrent release gives you adjustable long-time, short-time, and instantaneous protection curves, so you can coordinate selectivity with downstream breakers rather than relying on a fixed thermal-magnetic curve. An integrated undervoltage release (UVR) is built in — if the control voltage drops, the breaker trips automatically, which is useful for emergency-stop circuits or undervoltage protection on motor feeders.
Sizing and thermal derating
At 40 °C ambient the breaker carries the full 250 A; it holds that rating through 50 °C, then derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If your panel runs hot, factor the 55 °C curve for a 241 A continuous limit. Maximum power loss is 50.5 W — modest for a 250 A frame, but if you pack multiple breakers in a small enclosure, that heat adds up. Plan ventilation or derate accordingly.
Panel fit and mounting
The 3VA2225-6HL32-0BA0 measures 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON panelboards and distribution blocks without re-drilling gland plates.