What this MCCB delivers on the line
The Siemens SENTRON 3VA2225-5JP32-0BA0 is a 3-pole molded case circuit breaker rated for 250 A continuous current, built for line protection in distribution panels and motor control centers. It carries an interrupting capacity of 187 kA at 240 V and 121 kA at 415 V, so it handles high-fault scenarios without cascading upstream — critical for a main or feeder breaker in an industrial plant. The ETU550 electronic trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves. No auxiliary contacts ship with this variant, and there's no trip indicator on the front — plan for a separate status signal if your BMS or PLC needs breaker position feedback.
Thermal derating — what the 250 A rating really means
The 250 A continuous rating holds flat from 40 °C up to 50 °C ambient. At 55 °C it derates to 238 A, at 60 °C to 225 A, and at 70 °C to 200 A. If your panel runs hot — say a packed MCC with multiple breakers — size the load at the actual ambient, not the nameplate 250 A. The maximum power loss is 50.5 W per pole, which adds up in a sealed enclosure.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA2 frame footprint. It mounts on a DIN rail or can be screw-fixed to a backplate. The front face carries an IP40 protection rating, so it's fine for a clean indoor panel but not for washdown areas. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Built-in undervoltage release and communication
This breaker includes an undervoltage release (UVR) — part number 3VA9608-0BB11 — which trips the breaker when control voltage drops below a threshold. It also has a communication function, so it can integrate with a higher-level monitoring system via the SENTRON bus. No phase failure detection or ground fault monitoring is built in; those require separate modules or an external relay.