400 A frame, 80 A trip — what the interrupting ratings mean for a feeder circuit
The interrupting ratings tell you where this breaker can sit: 187 kA at 240 V AC, 121 kA at 415 V, 121 kA at 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. Thermal derating is published across the full operating range: full 400 A continuous at 40–50 °C, then 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C.
Mounting dimensions and panel fit
The breaker measures 248 mm high, 184 mm wide, and 110 mm deep. The 184 mm width for a 4-pole unit is typical for the 3VA2 frame; verify the bus-bar spacing in your existing switchboard before committing the cutout.
Built-in communication and shunt trip
This variant includes a communication function and a shunt trip release — meaning it can be remotely tripped via a control signal and integrated into a monitoring network. The shunt trip is useful for emergency-stop or undervoltage protection schemes where a PLC or safety relay needs to kill the breaker. The basic switch variant is order code 3VA2340-5JQ42-0AA0 if you need the same breaker without the shunt trip. Maximum power loss is 96 W at rated current — a factor for enclosure thermal calculations.