What this MCCB delivers for the panel
The Siemens SENTRON 3VA2225-5JP42-0KL0 is a 4-pole molded case circuit breaker rated 250 A continuous at 40 °C, with an ETU550 electronic trip unit for line protection. Its breaking capacity reaches 187 kA at 240 V and 121 kA at 415 V, so it handles high-fault utility feeds without cascading upstream — a key spec for main breaker or large feeder duty in industrial switchboards. The 250 A rating holds flat through 50 °C, then derates to 238 A at 55 °C and 200 A at 70 °C (–). For a panel that runs warm — say, a packed enclosure near a furnace line — plan the continuous load against the 55 °C or 60 °C column, not the 40 °C nameplate. Dimensions are 140 mm wide, 181 mm tall, 86 mm deep (–). That 86 mm depth is shallow enough to fit a standard 400 mm deep enclosure with room for rear cable lugs or a busbar stack. The 140 mm width on a 4-pole frame means it occupies about 35 mm per pole — typical for this class, so panel cutout layouts for a 3VA2 frame transfer directly.
Trip unit, auxiliaries, and communication
The ETU550 electronic trip unit supports LSIG protection (long-time, short-time, instantaneous, ground-fault) with adjustable curves. A voltage trigger and shunt trip (STL) release are built in, so the breaker can be remotely tripped by a safety PLC or emergency-stop circuit without an add-on module. Auxiliary contact configuration is 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ. That gives four discrete signals for status feedback — enough to report open/closed, trip cause, and a separate alarm to a DCS or SCADA without a separate I/O block. Communication function is present, meaning the ETU550 can interface with a communication module for remote monitoring and parameterization over PROFIBUS or PROFINET — useful for a facility that wants breaker-level energy data without a separate power meter per feeder.