Siemens SENTRON 3VA1140-6ED42-0AA0 — 40 A MCCB with TM210 Release
The TM210 thermal-magnetic release handles overloads and short-circuits in one compact package — no separate trip unit to order.
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.