The Siemens SENTRON 3VA2225-5JQ42-0GH0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current, built around the ETU560 electronic trip unit. It's configured for line protection — no undervoltage release, no phase-failure detection, but it does carry a communication function for remote monitoring and a ground-fault summation-current scheme on L+N. The interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V, and 4.5 kA at 690 V, so it's sized for high-fault industrial panels where selectivity matters.
Ratings and what they mean for fit
The 250 A rating holds flat from 40 °C through 50 °C — no derating needed in a warm panel. At 55 °C it drops to 240.625 A, at 60 °C to 231.25 A, at 65 °C to 221.875 A, and at 70 °C to 212.5 A. That thermal curve means a panel running at 50 °C ambient still gets full 250 A; push past that and the ETU560 adjusts the trip threshold accordingly. The 800 V rated insulation voltage (Ui) covers 480 V and 600 V class systems with headroom. The auxiliary contact block ships as 2 auxiliary switches plus 1 trip-alarm switch (HQ version). The integrated auxiliary trip is order code 3VA9908-0BC25; the basic switch assembly is 3VA2225-5JQ42-0AA0. That's useful for panel builders wiring status feedback back to a PLC or SCADA — the trip alarm gives a dedicated signal that the breaker opened on fault, not on manual switching.
Panel integration
Dimensions are 181 mm high, 140 mm wide, 107 mm deep. The front face carries IP40 protection — fine for a closed panel, not for washdown. The 4-pole footprint fits standard Siemens SENTRON mounting patterns; the ETU560 interface and communication port are accessible from the front. Maximum power loss is 55 W, so factor that into enclosure thermal calculations.