MCCB with 250 A continuous rating and 330 kA interrupting capacity
The Siemens SENTRON 3VA2225-7HN32-0JC0 is a 3-pole molded case circuit breaker rated for 250 A continuous current (Iu) and delivers a 330 kA breaking capacity at 240 V — enough to handle high-fault utility feeds and large transformer secondaries without cascading upstream devices. It carries an ETU350 electronic trip unit (line protection version), so you get adjustable long-time, short-time, and instantaneous protection curves rather than fixed thermal-magnetic response — useful for coordinating with downstream feeders and motor starters in a selective-coordination study. The breaker measures 86 mm deep by 105 mm wide by 181 mm high, fitting standard SENTRON panel footprints and busbar systems used across industrial switchboards.
Breaking capacity across voltages — where the 330 kA matters
At 415 V and 440 V the interrupting rating holds at 242 kA, dropping to 187 kA at 500 V and 6.3 kA at 690 V. The 330 kA at 240 V is the headline figure for low-voltage utility entrance applications; for 400 V-class distribution panels the 242 kA rating still provides substantial fault-current headroom above typical transformer ratings.
Trip unit and auxiliary options
The breaker ships with a shunt trip (STL) auxiliary release (design integrated) and two auxiliary switches HQ for remote status indication or interlocking. No undervoltage release, no ground-fault monitoring, and no communication module are included on this variant. Rated insulation voltage is 800 V, and maximum power dissipation is 48 W — relevant for enclosure thermal calculations when grouping multiple breakers.