The Siemens SENTRON 3VA1140-3EF36-0AE0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous at 40 °C, with a TM240 thermal-magnetic release designed for line protection. It carries an interrupting capacity of 75.6 kA at 240 V, stepping down to 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at 500 V or 690 V — that coverage matters when you're coordinating downstream faults and need to know the breaker can clear a bolted fault at the service voltage without welding contacts.
The 40 A rating holds flat across ambient temperatures from 40 °C to 50 °C, then derates only to 39 A at 55-60 °C and 38 A at 65 °C, finally 37 A at 70 °C. That thermal stability means you don't lose headroom in a warm enclosure — the breaker stays at full rating through most panel conditions. The breaker is 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-pole footprint that mounts on a DIN rail or panel-mount plate.
This is a line-protection MCCB for main or branch feeder duty in a SENTRON distribution board or standalone enclosure. The 3-pole configuration suits three-phase loads — panel feeds, motor control centers, or sub-distribution.