The Siemens SENTRON 3VA2340-6KP32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, configured for line protection with an ETU850 electronic trip unit. It carries a breaking capacity of 242 kA at 240 V and 187 kA at 415 V, making it suitable for high-fault-current distribution panels in industrial switchgear.
Ratings and what they mean for the panel
The 400 A rating holds flat from 40 °C to 50 °C, then derates linearly to 300 A at 70 °C. If your enclosure ambient runs above 50 °C, you lose 25 A per 5 °C step — plan the thermal budget accordingly. The 242 kA at 240 V and 187 kA at 415 V tell you this breaker can interrupt a bolted fault at those levels without welding or rupturing, which is critical for high-capacity transformer secondaries or busway feeds. Rated insulation voltage is 800 V, so it's safe for 690 V line-to-line systems common in heavy industrial drives. The ETU850 release provides electronic long-time, short-time, instantaneous, and ground-fault protection curves — adjustable via the front panel or communication interface.
Communication and auxiliary contacts
This MCCB includes a communication function and three auxiliary switches (HQ type) for status feedback to the PLC. No undervoltage release, no voltage trigger, and no ground-fault monitoring are fitted on this variant.
Dimensions and panel fit
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep. Account for handle throw and rear terminals when sizing enclosure depth.