What this MCCB is and what it does
The Siemens 3VA2140-8KQ46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current in a 4-pole configuration, designed for line protection duty. It carries a full-scale value of 40 A and a minimum setting of 60 A, meaning the thermal-magnetic trip unit is adjustable down to 60% of the 40 A frame — useful for matching the breaker to a slightly smaller continuous load without swapping the frame. Breaking capacity is 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V — these are the maximum fault currents the breaker can safely interrupt at each voltage level, which matters for SCCR compliance in a panel. Insulation voltage is rated 800 V, giving headroom for 690 V systems.
Built-in communication and ground-fault monitoring
This MCCB includes a communication function onboard (: Yes), so it can talk to a higher-level control system — typically via PROFIBUS or PROFINET on the 3VA platform — for remote trip indication, load monitoring, and parameter readback. The ground-fault monitoring uses summation current formation on L+N conductors, meaning it measures the vector sum of phase and neutral currents to detect leakage to earth, without needing a separate core-balance CT.
Physical fit and panel integration
Dimensions are 86 mm deep, 140 mm wide, 181 mm tall (3.39 x 5.51 x 7.13 inches). The 140 mm width is standard for a 4-pole MCCB in the 3VA frame — it will occupy four 35 mm DIN-rail mounting spaces side by side. Verify the panel cutout and busbar spacing match before committing the BOM line.