400 A line protection with 187 kA interrupting capacity
The Siemens 3VM1340-5ED42-0AA0 is a SENTRON molded case circuit breaker (MCCB) sized for 400 A at 40 °C continuous, with a 4-pole configuration and a TM210 thermal-magnetic overcurrent release. Its interrupting rating of 187 kA at 240 V AC means it can safely clear a bolted fault at that level without upstream devices needing to coordinate — useful for high-fault-capacity service entrances or transformer secondaries where available fault current is substantial. Rated operational voltage is 690 V AC, with a rated insulation voltage of 800 V, so it suits 480Y/277 V and 600 V delta systems common in North American and European industrial panels. The 4-pole design handles three-phase plus neutral switching, or can be used on three-phase loads with the fourth pole as a switched neutral.
Thermal-magnetic trip and derating profile
The TM210 trip unit is a fixed thermal-magnetic type — no interchangeable rating plugs, no electronic adjustments. The thermal element tracks the 400 A rating up to 50 °C ambient; above that, the breaker derates linearly to 367 A at 70 °C. If the panel ambient runs hot (enclosed switchgear, solar combiner, or near a furnace line), the 55 °C figure of 392 A and the 60 °C figure of 384 A give you the actual continuous current the breaker can carry without nuisance tripping. Maximum power loss is 92 W at rated current — a factor for enclosure heat rise calculations when multiple breakers are ganged in a single panel. The IP40 front protection means the breaker face is sealed against tools and wires over 1 mm, but the enclosure itself must manage the heat dissipation.
Interrupting ratings across common system voltages
At 415 V and 440 V AC, the interrupting capacity holds at 121 kA; at 500 V it drops to 76 kA. For DC applications, the maximum rated operational voltage is 500 V DC — the manufacturer directs to the 3VA manual for specific DC switching capacity values, as the DC performance depends on the time constant and pole configuration.
Panel fit and mounting
Dimensions are 248 mm high, 184 mm wide, 110 mm deep — a standard 4-pole MCCB footprint that fits most Siemens SENTRON mounting plates and busbar systems. The 110 mm depth is the body depth; allow additional clearance for rear terminals and arc-chamber venting per the manufacturer's mounting instructions.