What this MCCB carries and where it fits
The Siemens 3VA1332-7EF32-0AA0 is a SENTRON molded case circuit breaker (MCCB) with a TM240 thermal-magnetic overcurrent release, designed for line protection in distribution panels. Its 320 A continuous rating holds flat from 40 °C through 50 °C, then derates to 313 A at 55 °C and 292 A at 70 °C — a thermal curve that matters when the breaker sits in a warm enclosure alongside other heat sources. Breaking capacity is 440 kA at 240 VAC, 242 kA at 415 V and 440 V, 154 kA at 500 V, and 17 kA at 690 V. That 440 kA figure at 240 V is the headline number, but for a 400 V-class panel the 242 kA at 415 V is the one that governs the fault-withstand decision against the upstream transformer. Rated insulation voltage is 800 V, and the front face carries IP40 protection — suitable for indoor panel mounting where no water spray reaches the breaker face. The 138 mm width, 248 mm height, and 110 mm depth fit the standard 3-pole MCCB footprint for DIN-rail or panel-mount integration.
Sourcing and lifecycle
Maximum power loss is 80.1 W — a figure to include in the enclosure thermal budget when grouping several breakers in a single panel.
Peer comparison note
Compared to the smaller-frame 3VA1112-5EE32-0AA0, this 3VA1332-7EF32-0AA0 carries a higher continuous current (320 A vs the 1112's lower rating) and a TM240 release instead of a lower TM setting. The 3VA1110 variants (5ED32-0AA0, 5ED36-0AA0) are also 3-pole but with lower ampacity and different trip curves. Panel cutout dimensions differ between the 3VA1 frame sizes, so a swap between the 1332 and the 1112 series requires verifying the mounting footprint and bus-bar spacing.