The Siemens SENTRON 3VA2340-6KP32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with an adjustable trip range from 600 A to 4 000 A via the ETU850 electronic trip unit. This is a line-protection device, not a motor-protection breaker — it's designed for feeder and main disconnect duty where selectivity and coordination matter.
Interrupting capacity and voltage dependence
Interrupting capacity drops sharply with system voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. That 690 V figure tells you this breaker is not intended for 690 V main service — it's a 400 V class device with generous headroom for high-fault applications at the lower voltages.
Thermal derating profile
Above that it derates linearly: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C.
ETU850 electronic trip unit and communication
Communication function is built in, so this breaker can report status and trip events to a higher-level control system — useful for a main breaker in a switchboard where you want remote trip indication without adding aux contacts.
Dimensions are 248 mm height, 138 mm width, 110 mm depth.