Siemens SENTRON 3VA1140-6ED42-0AA0 — 40 A MCCB with TM210 Release
The Siemens SENTRON 3VA1140-6ED42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying 40 A continuously at 40 °C ambient without derating. The TM210 thermal-magnetic release handles overloads and short-circuits in one compact package — no separate trip unit to order. Breaking capacity hits 220 kA at 240 V AC, which is enough for high-fault utility feeds or transformer secondaries where the available fault current is substantial. The 800 V rated insulation voltage gives headroom for 480 V and 600 V class systems without creeping along the edge of the rating.
Thermal Derating and Panel Integration
The 40 A rating holds flat from 40 °C through 50 °C, then drops to 39 A at 55–60 °C and 38 A at 65 °C, reaching 37 A at 70 °C. That is a shallow derating curve — only 3 A lost across a 30 °C rise — so it handles warm enclosures without oversizing the frame. The 70 mm depth and 101.6 mm width fit standard Siemens 3VA panel footprints; the IP40 front protection means it is suitable for enclosed distribution boards where the front face is behind a door. Maximum power loss is 10.8 W, which factors into enclosure thermal calculations when grouping several breakers.