The Siemens SENTRON 3VA2040-5KQ46-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous current, designed for line protection in distribution panels. Its adjustable thermal-magnetic trip unit covers a 60 A to 480 A range, letting you dial in the overload and short-circuit settings to match the downstream load without swapping the breaker body. Breaking capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA at 240 V means it can safely interrupt a fault current of that magnitude — critical for high-fault installations like large transformer secondaries or industrial service entrances where available fault current is high. Rated current holds flat at 40 A from 40 °C all the way to 70 °C ambient — no derating needed in a warm enclosure, which simplifies panel thermal calculations. The breaker includes a communication function and ground-fault monitoring via summation current formation on L+N conductors.
Panel integration
Dimensions are 86 mm deep, 140 mm wide, 181 mm tall — fits standard 4-pole MCCB panel cutouts. The 140 mm width is the same footprint as other SENTRON 3VA2 frame breakers, so a panel laid out for a 3VA2063-8JQ42-0AA0 accepts this one without re-drilling the mounting plate or re-routing bus bars.