The Siemens SENTRON 3VA2040-5HM32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, designed for line protection in distribution panels. It carries a 187 kA interrupting rating at 240 V, dropping to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V — that SCCR headroom means it can be applied upstream in high-fault substations without cascading failures. No derating across the full ambient range from 40 °C to 70 °C (–): the 40 A rating holds at every temperature in that band, so a panel at 60 °C still delivers full rated current.
Ground-fault and monitoring capability
This MCCB includes summation-current ground-fault monitoring on the L-conductor. That means it can detect residual current on a three-phase circuit without a separate GFCI module — a useful feature for a 40 A feeder where ground-fault coordination is required.
Footprint is 105 mm wide, 181 mm tall, 86 mm deep (–). That 105 mm width is standard for a 3-pole SENTRON 3VA frame — it occupies three 35 mm DIN increments. Operating temperature range is -25 °C to 70 °C; storage range -40 °C to 80 °C. Power dissipation at rated load is 2.2 W maximum — negligible for panel thermal budgeting.