The Siemens SENTRON 3VA1140-5EF36-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated at 40 A continuous at 40 °C, designed for line protection in distribution panels and industrial switchboards. Rated insulation voltage is 800 V, and the unit dissipates 10.8 W maximum at rated load — a figure to consider for enclosure thermal budgeting when packing several breakers in a single panel.
Breaking capacity across voltage — where it fits
The interrupting rating drops sharply as system voltage rises: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. At 690 V the 17 kA SCCR is modest — verify the available fault current at the installation point before committing this breaker to a 690 V bus.
Thermal derating and ambient limits
The breaker holds its full 40 A rating from 40 °C through 50 °C, then derates to 39 A at 55–60 °C, 38 A at 65 °C, and 37 A at 70 °C. Operating ambient range is -25 °C to +70 °C; storage range is -40 °C to +80 °C.
Dimensions are 70 mm depth, 76.2 mm width, 130 mm height — a standard 3-pole MCCB footprint that fits Siemens SENTRON mounting bases and most DIN-rail adapter plates. The 76.2 mm width (3 inches) matches the typical 3-pole module spacing in distribution panelboards.