The Siemens SENTRON 3VA1140-3EF36-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous 40 A at 40 °C with a 75.6 kA interrupting capacity at 240 V AC. That breaking capacity drops to 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at 500 V and 690 V — so the available fault current at the panelboard determines which voltage tap you land it on. The auxiliary switch configuration is two HQ auxiliary switches, giving you status feedback for the PLC or annunciator without an add-on module.
At 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. Maximum power loss is 13.3 W, which is modest for a 40 A frame and won't drive much internal temperature rise in a standard enclosure, but it's still a factor if you're packing multiple breakers in a small dead-front panel.
The breaker measures 130 mm high, 76.2 mm wide (3 in), and 70 mm deep (2.76 in).
Operating environment and storage
Storage range is wider: -40 °C to 80 °C, which covers unheated warehouses and shipping containers. The operating minimum of -25 °C means it's fine for outdoor enclosures in most temperate climates, but not for deep-freeze or arctic installations without supplementary heating.