The Siemens SENTRON 3VA1140-3EF36-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. It carries a continuous current of 40 A at 40 °C ambient, with a TM240 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). Breaking capacity reaches 75.6 kA at 240 V AC, tapering to 11.9 kA at 690 V AC — sufficient for most industrial distribution panels and motor branch circuits.
Current and breaking capacity
Rated current holds at 40 A from 40 °C through 50 °C, then derates gradually to 37 A at 70 °C (the maximum operating temperature). The 3-pole design interrupts fault currents up to 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. Insulation voltage is rated 800 V.
Physical fit and panel integration
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a compact footprint for a 40 A MCCB. Mounts on DIN rail or direct panel; the width (76.2 mm) is three 25.4 mm pole pitches, standard for 3-pole breakers. Operating temperature range is -25 °C to +70 °C; storage from -40 °C to +80 °C.