What this MCCB delivers
The Siemens SENTRON 3VA2325-8HM32-0AA0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at up to 70 °C ambient — no derating needed across the full operating range. The ETU330 electronic trip unit provides adjustable overload and short-circuit protection for line protection duty. With a short-circuit breaking capacity of 440 kA at 240 V and 330 kA at 415 V, this breaker handles high-fault installations without cascading upstream. Insulation voltage is rated 800 V, so it suits 480 V and 600 V class systems with headroom.
SCCR and selectivity planning
The 3VA2325-8HM32-0AA0 carries SCCR values that drop as system voltage rises: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. For a 480 V panel, the 220 kA rating at 500 V is the relevant figure — enough for most industrial service-entrance and distribution sections. The ETU330 trip unit supports adjustable I²t curves, making coordination with downstream breakers straightforward during selectivity studies.
Thermal performance and panel fit
Rated current holds at 250 A from 40 °C through 70 °C ambient — no derating curve to apply for typical enclosure temperatures. Maximum power loss is 37.5 W, which keeps internal cabinet heat rise manageable. Dimensions are 248 mm high, 138 mm wide, 110 mm deep. The IP40 front protection means it is suited for enclosed panel mounting where no water ingress is expected. An optional motor drive is available for remote operation.