The Siemens SENTRON 3VA2340-6JP32-0AC0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current Iu of 400 A, fitted with an ETU550 electronic trip unit for line protection. Its interrupting capacity reaches 242 kA at 240 V and 187 kA at 415 V, which covers most industrial fault-current scenarios without cascading upstream. The 400 A frame and 3-pole configuration suit main feeder or large motor branch protection in switchboards and distribution panels.
Breaking capacity and selectivity headroom
The 242 kA at 240 V and 187 kA at 415 V ratings give this MCCB substantial SCCR headroom for high-fault installations. At 690 V the rating drops to 40 kA — still adequate for most 690 V industrial networks. The ETU550 electronic trip unit allows adjustable long-time, short-time, and instantaneous pickup, enabling selective coordination with downstream breakers. This matters when you need to clear a fault on a branch without taking the whole panel off-line.
Thermal derating and panel integration
The breaker carries its full 400 A rating up to 50 °C ambient. Above that, derate linearly: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. The 138 mm width and 248 mm height fit standard MCCB mounting footprints; depth is 110 mm. IP40 on the front protects against tool entry in a closed panel. Maximum power loss is 96 W — account for this in enclosure thermal calculations, especially in a crowded switchboard.