Siemens SENTRON 3VA2040-5KP46-0AA0 — 40 A MCCB with ETU850 Trip Unit
The Siemens SENTRON 3VA2040-5KP46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, designed for line protection in industrial power distribution panels. It carries the ETU850 electronic trip unit, which provides adjustable overload and short-circuit protection with a setting range from 60 A up to 480 A, giving the specifying engineer flexibility to match the breaker to the actual load without changing the frame. Breaking capacity is rated at 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. These figures define the maximum fault current the breaker can safely interrupt at each voltage level — critical for selectivity coordination studies in a distribution board where upstream breakers must see the fault and remain closed. Rated insulation voltage is 800 V, and the breaker includes a communication function for integration into a plant-wide monitoring or energy management system. The front face carries IP40 protection, suitable for installation inside a switchboard enclosure where the door provides the environmental seal.
Dimensions and Panel Integration
Physical dimensions are 86 mm depth, 140 mm width, and 181 mm height. Power loss is rated at a maximum of 2.2 W, which is negligible for thermal dissipation calculations inside a sealed panel — no forced ventilation is required for this single device.
Environmental and Operational Limits
The breaker is rated for continuous operation at 40 A across the full ambient temperature range from 40 °C to 70 °C, with no derating required up to 70 °C. Storage temperature range is -40 °C to 80 °C. Operating temperature limits are -25 °C to 70 °C. These ratings confirm suitability for installation in unconditioned electrical rooms or outdoor-rated enclosures within those ambient limits.