What this MCCB carries — and where the numbers matter
The Siemens 3VA2225-5JP32-0HA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current, fitted with an ETU550 electronic trip unit and a shunt trip release. It is designated for line protection — meaning it sits upstream of distribution or motor loads, not as a dedicated motor-circuit protector. The interrupting ratings climb to 187 kA at 240 V and hold at 121 kA through 440 V, then drop to 79 kA at 500 V and 5.1 kA at 690 V — so the SCCR you need for the fault-current study has to be checked at the actual system voltage, not the headline number. The thermal derating curve is published: full 250 A up to 50 °C, then 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. If the panel ambient runs hot — say, next to a drive cabinet — that 200 A at 70 °C is the real limit, not the nameplate. The unit draws 48 W maximum power loss, which adds to the enclosure heat budget. Dimensions are 181 mm high, 105 mm wide, 86 mm deep. It fits the standard SENTRON 3VA2 footprint, so a panel laid out for a 3VA2 frame accepts this unit without re-drilling the mounting plate. The basic switch reference is 3VA2225-5JP32-0AA0; the integrated shunt trip is 3VA9688-0BL30.
Trip unit and auxiliary options
The ETU550 is an electronic overcurrent release with communication capability — it supports the SENTRON powerconfig software for parameterization and event logging. There is no undervoltage release, no ground-fault monitoring, and no auxiliary contact fitted on this variant. The shunt trip (STL) is included for remote tripping, wired to a separate control voltage. The unit has a voltage trigger function and a mechanical endurance of 20,000 operations. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Rated insulation voltage is 800 V. The unit does not include a trip indicator or phase-failure detection.