What this MCCB carries and where it fits
The Siemens 3VA2340-5JQ32-0JC0 is a SENTRON 3VA2 molded case circuit breaker rated for line protection in distribution panels. It is a 3-pole unit with a full-scale current of 400 A and an adjustable overload range from 600 A minimum to 4 000 A maximum — meaning the long-time pickup can be set anywhere in that band to match the protected feeder. Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. That spread covers most low-voltage industrial service entrances and large motor control center feeders without needing a current-limiting fuse upstream. Thermal derating is published per degree: full 400 A up to 50 °C, then 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If the panel ambient runs above 50 °C, size the breaker for the derated figure — the nameplate 400 A only holds below that threshold.
Built-in auxiliaries and communication
This variant ships with two auxiliary switches (HQ type) and a shunt trip release (STL) for remote tripping. The communication function is present on the breaker, so it can report status and alarms over a bus without an external module — useful for a panel that feeds a monitored process line. The basic switch is the 3VA2340-5JQ32-0AA0, meaning the -0JC0 suffix adds the communication and auxiliary-switch package. No undervoltage release is fitted on this order code.
Physical fit and panel integration
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep. That is a standard 3-pole MCCB footprint for the 3VA2 frame size — it bolts into a distribution panel or switchboard via the rear mounting plate, not a DIN rail. Maximum power loss at rated current is 96 W, so factor that into the panel thermal budget if the breaker is enclosed in a low-ventilation cabinet.