The Siemens 3VA2340-5JP32-0AJ0 is a SENTRON molded case circuit breaker (MCCB) rated for 400 A continuous current across a 40 °C to 50 °C ambient range, with no derating needed in that band. At 55 °C it carries 375 A, at 60 °C 350 A, at 65 °C 325 A, and at 70 °C 300 A — so if your panel runs hot, you size the breaker for the actual ambient, not the nameplate.
Breaking capacity and fault clearing
This 3-pole MCCB delivers 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. Those are the maximum interrupting ratings at each voltage level — enough to clear high-fault-current scenarios downstream of a large transformer without cascading upstream breakers.
Line protection design with communication
Designed for line protection (not motor or generator protection), it includes a communication function for integration into a monitored distribution system. The supplied basic switch is order code 3VA2340-5JP32-0AA0. It ships with 2 auxiliary switches plus 1 trip alarm switch (HP type). No undervoltage release, no ground-fault monitoring, and no auxiliary release are fitted — so if you need those, you order them separately or choose a different variant.
Physical footprint and panel fit
Dimensions: 248 mm high, 138 mm wide, 110 mm deep. That 110 mm depth is the panel depth you need behind the door — check your enclosure clearance before committing the cutout. The 138 mm width is the pole pitch for a 3-pole unit; it occupies the same footprint as other SENTRON 3VA2 3-pole breakers in this frame size.
Environmental and power loss
Operating temperature range -25 °C to +70 °C; storage from -40 °C to +80 °C. Maximum power loss at rated load is 96 W — that heat goes into the enclosure, so factor it into your thermal management if the panel is densely packed.