SENTRON 3VA1140-5EF36-0AA0 — 40 A MCCB with TM240 Release
The Siemens 3VA1140-5EF36-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in 3-pole configuration. Its TM240 thermal-magnetic release is set for a continuous current of 40 A at 40 °C, with a derating curve that holds 40 A up to 50 °C, then drops to 39 A at 55 °C and 37 A at 70 °C — useful to know when the breaker is packed into a warm enclosure. Breaking capacity is 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. That 187 kA figure at 240 V means it can interrupt very high fault currents on a 240 V distribution bus — typical for large transformer-fed switchboards. The rated insulation voltage is 800 V, so the breaker is suitable for 690 V line-to-line systems as well.
Panel Integration and Mounting
Dimensions are 130 mm height, 76.2 mm width, and 70 mm depth. The width is a standard 3-inch (76.2 mm) footprint for a 3-pole MCCB — fits the usual panel cutout and bus bar spacing. Front IP40 protection class means it is protected against tools and small wires but not washdown; mount it inside a sealed enclosure if the environment is wet or dusty.