The Siemens SENTRON 3VA1140-5EF36-0AE0 is a 3-pole molded case circuit breaker rated for line protection at 40 A continuous current (Iu). It carries a TM240 thermal-magnetic release — fixed thermal, magnetic trip adjustable — and ships with four HQ auxiliary switches for status feedback. The interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V, which covers most industrial distribution panels without needing a current-limiting upstream device.
Ratings and derating
The 40 A rating holds flat from 40 °C through 50 °C. Above that it steps down: 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C. If the panel ambient runs hot — say a sealed enclosure near a furnace line — size the breaker for the derated figure, not the nameplate 40 A. The rated insulation voltage is 800 V, and the front face carries IP40 protection, so it's fine in a clean indoor panel but not washdown.
Mounting and integration
Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — a standard 3-pole MCCB footprint that clips onto DIN rail or mounts with screws to a backplate. The 4 HQ auxiliary switches give you two form-C contacts for status to a PLC and two for a local indication lamp, all without an add-on module. No undervoltage release, no shunt trip, no communication module on this variant — it's a plain thermal-magnetic breaker for straightforward feeder protection.