The Siemens SENTRON 3VA1140-5EF36-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection at 40 A continuous (at 40 °C ambient). Its headline breaking capacity hits 187 kA at 240 V AC and 121 kA at 415 V AC — figures that cover high-fault utility feeds and transformer secondaries without needing a current-limiting upstream device. The 800 V rated insulation voltage confirms it's built for 400 V class industrial panels with headroom to spare. This MCCB carries an undervoltage release (UVR) as the auxiliary release, plus two HQ auxiliary switches for status feedback to a PLC or annunciator. The 70 mm depth and 76.2 mm width fit standard Siemens SENTRON panel footprints — same base as the 3VA1 family, so a swap from a lower-rated sibling like the 3VA1110-5ED36-0AC0 should reuse the same mounting holes and busbar connections without panel rework.
Compared to the 3VA1110-5ED36-0AC0 (a 3-pole 100 A frame), the 3VA1140-5EF36-0BC0 is a 40 A continuous rating on the same mechanical platform — same 70 mm depth, same 76.2 mm width. The key difference is the lower amp rating paired with the same high-interrupting cassette (187 kA at 240 V), so you get selectivity headroom on a smaller load circuit without upsizing the panel cutout.
Mounts in a standard SENTRON distribution panel or motor control center — DIN-rail or screw-mount baseplate, depending on the enclosure kit. The 3-pole block occupies three 18 mm module spaces (54 mm total on a DIN rail). The undervoltage release trips the breaker when control voltage drops below dropout threshold; wire it to an E-stop chain or safety relay for coordinated shutdown. The two HQ auxiliary switches are pre-wired to a common terminal block — one NO + one NC per switch, rated for 6 A at 230 V AC for pilot duty.