Line protection MCCB with TM220 release
The Siemens 3VM1140-5EE42-0AA0 is a SENTRON 4-pole molded case circuit breaker designed for line protection in distribution panels. Its TM220 thermal-magnetic overcurrent release combines a thermal bimetal for overloads and a magnetic coil for short circuits, giving you a fixed-trip breaker that needs no adjustment in the field. Rated 40 A continuously at 40 °C ambient, it derates to 37 A at 70 °C — a straight thermal curve you can plan into your panel's heat budget. The 400 A frame means the same physical breaker shell can be fitted with lower-rated trip units across the family, but this variant ships with the 40 A TM220 already installed. Interrupting capacity reaches 187 kA at 240 V AC and 121 kA at 415 V AC, dropping to 17 kA at 500 V AC. That 187 kA figure at 240 V is typical for high-fault utility transformers or large motor control center buswork; at 415 V the 121 kA still clears most industrial fault scenarios without cascading upstream. Rated insulation voltage is 800 V, and the front face carries IP40 protection — fine for a closed panel, but not for washdown environments. The 11 W maximum power loss at full load matters when you're stacking several breakers in a sealed enclosure; factor it into your thermal rise calculation.
Panel fit and mounting
The 3VM1140-5EE42-0AA0 measures 130 mm high, 101.6 mm wide, and 70 mm deep. That 70 mm depth is the dimension from the mounting surface to the front of the breaker — critical when you're laying out gland plates or door clearance on a shallow enclosure. Width at 101.6 mm (4 inches) matches the standard 4-pole MCCB footprint on a DIN rail or mounting plate. No undervoltage release, no shunt trip, no communication module — this is a bare line-protection breaker. If you need remote tripping or status feedback, you'll add accessories externally or step to a 3VA series variant that supports those options.
Lifecycle and sourcing posture
This part carries a current lifecycle stage — meaning Siemens still lists it as an active catalog number with no announced end-of-life. No successor has been published, so the 3VM1140-5EE42-0AA0 remains the direct order code for this rating and release combination.