Breaking capacity and selectivity headroom
The 3VA2340-5JQ32-0AE0 is a SENTRON molded case circuit breaker rated for line protection, carrying 187 kA interrupting capacity at 240 V and 121 kA at 415 V. At 690 V the rating drops to 7.5 kA — the arc extinction physics change above 500 V, so verify your fault-current study against the voltage-specific curve before committing this breaker to a high-impedance ground or 690 V bus. The thermal-magnetic trip is adjustable from 600 A minimum to 4 000 A maximum, with a full-scale value of 400 A. That 400 A figure is the continuous current rating at 40 °C through 50 °C; at 55 °C derate to 375 A, at 60 °C to 350 A, at 65 °C to 325 A, and at 70 °C to 300 A. If the panel ambient runs above 50 °C, the 400 A nameplate no longer governs — use the derated value for your cable and busbar sizing.
Panel integration and auxiliaries
Footprint is 138 mm wide by 248 mm tall by 110 mm deep — a 3-pole frame that fits standard MCCB mounting plates. The breaker ships with 4 auxiliary switches (HQ configuration) and no undervoltage or shunt release; if your safety circuit requires a UVR, order the auxiliary release separately and verify the slot compatibility. Communication function is built in — the listing flags a yes on comms, so this variant includes the electronic trip unit with Modbus or PROFIBUS capability (confirm protocol via the order code suffix). Maximum power loss is 96 W at rated current; account for that heat in your enclosure ventilation calculation.