What this MCCB delivers for a panel
The Siemens SENTRON 3VA2040-7KQ42-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous, with an adjustable overcurrent trip range from 60 A to 480 A — meaning you set the pickup to match the load, not the other way around. Breaking capacity reaches 330 kA at 240 V, 242 kA at 415/440 V, and still 187 kA at 500 V, so it handles high-fault utility feeds without cascading upstream. No trip indicator or undervoltage release on this variant; the communication function and ground-fault monitoring via summation current are built in for line protection duty.
Physical fit and environment
Dimensions are 86 mm deep, 140 mm wide, 181 mm high (3.39 × 5.51 × 7.13 in) — fits standard panel-mount cutouts for 4-pole MCCBs in the 40 A frame class. Operating temperature range -25 to 70 °C with no derating on the 40 A rating across that span (–); storage from -40 to 80 °C. Max power loss is 1.2 W, negligible for enclosure thermal budgeting.
Selectivity and coordination notes
Rated insulation voltage 800 V gives headroom for 480/600 V systems. The adjustable trip range (60–480 A) and high interrupting capacity let you coordinate downstream with smaller MCCBs or fused switches — the 330 kA at 240 V is typical for transformer secondary protection. Ground-fault monitoring uses summation current on L+N, so it detects leakage without a separate GFCI module.