Siemens 3VA1140-4EF36-0DA0 — 40 A MCCB with undervoltage release
The Siemens SENTRON 3VA1140-4EF36-0DA0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current at 40 °C, with the TM240 thermal-magnetic overcurrent release. Breaking capacity hits 121 kA at 240 V and 75.6 kA at 415 V, so it handles high-fault service-entrance or distribution panels without cascading upstream. This is the line-protection version, meaning it's set up for cable and busbar protection in a main or subfeed panel, not motor-circuit protection. No communication function, no phase-failure detection, no ground-fault monitoring — it's a straightforward thermal-magnetic breaker with the UVR as the only accessory built in.
Above 55 °C it steps down: 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, 36 A at 70 °C. Breaking capacity varies sharply with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 11.9 kA at 690 V. At 690 V it's still adequate for most industrial distribution, but verify your available fault current against the 11.9 kA ceiling. The IP40 front protection means it's splash-proof on the front face but not sealed against hose-down — mount inside a panel with a door.
Footprint is 76.2 mm wide (3-pole), 130 mm tall, 70 mm deep. That's a standard MCCB cutout — drops into the same panel space as other 3VA1 frames. No auxiliary contacts fitted, so if you need status feedback to a PLC, you'll add the 3VA9608-0BB25 auxiliary trip block or a separate auxiliary switch. Verify your control voltage matches the UVR coil rating (not listed here, but standard 24 VDC or 230 VAC per the 3VA family).