Integrator's spec recap — 3VA2225-4HM42-0AA0
The Siemens SENTRON 3VA2225-4HM42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with an ETU330 electronic trip unit for line protection. Its interrupting capacity hits 121 kA at 240 V, tapering to 75.6 kA at 415 V and 440 V, 52.5 kA at 500 V, and 4.5 kA at 690 V — so it handles high-fault utility feeds and transformer secondaries where the available fault current is substantial. The 250 A rating holds flat through 50 °C; above that it derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. The ETU330 is an electronic overcurrent release with adjustable N-conductor protection (OFF, 50%, 100%) and ground-fault monitoring via summation current formation on the L+N conductor.
Dimensions are 140 mm wide, 181 mm high, 86 mm deep — a standard 4-pole MCCB footprint for the SENTRON 3VA platform. The 86 mm depth (3.39 in) is the projection behind the panel face; factor that into enclosure depth when routing busbars or cables behind the breaker.