The Siemens 3VA2140-5JQ42-0AA0 is a 4-pole SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current, with an adjustable thermal-magnetic trip unit spanning 60 A minimum to 480 A maximum — meaning you set the actual protection point within that window to match the downstream load. Breaking capacity is 187 kA at 240 VAC, dropping to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V — the 240 V figure tells you this breaker handles high available fault current at lower voltages typical of North American distribution panels. Ground-fault monitoring uses summation current formation on L+N conductors, so it detects leakage without a separate GFCI module.
Sizing and selectivity
Maximum power loss is 1.6 W, low enough that adjacent devices see minimal heat rise in a crowded DIN-rail or panel-mount arrangement. The adjustable trip range (60–480 A) lets you coordinate with upstream and downstream devices for selective coordination — set the magnetic pickup above the inrush of downstream motor starters or downstream MCCBs.