What this MCCB is and what it handles
The Siemens SENTRON 3VA2325-5HM42-0AA0 is a 4-pole molded case circuit breaker rated for 250 A continuous current with no derating across the full operating range from -25 °C up to 70 °C — a solid spec for a warm panel or a high-ambient machine cell. Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — that kind of headroom at the lower voltages means this breaker handles high-fault utility feeds or transformer secondaries without worrying about cascading upstream. Designed for line protection with ground-fault monitoring via summation current formation on L + N conductors, and a rated insulation voltage of 800 V.
Sizing and selectivity — what the ratings mean for your panel
The 250 A frame is set with an adjustable thermal-magnetic trip that ranges from a minimum of 375 A to a maximum of 3000 A, with an initial value of 50 A — so you can fine-tune the pickup point to match your downstream load profile without swapping the breaker body. Power loss maxes out at 37.5 W, which is modest for a 250 A frame — keeps the heat rise inside a multi-breaker enclosure manageable. Physical envelope is 110 mm deep, 184 mm wide, and 248 mm tall — a standard 4-pole MCCB footprint that drops into most SENTRON panelboards and switchboards without re-drilling the mounting plate.