What it is and what it does
Siemens SENTRON 3VA2140-8JQ36-0AA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. Rated continuous current is 40 A, with an adjustable trip range from 60 A minimum to 480 A maximum — meaning it protects downstream conductors and equipment against overloads and short circuits up to that full-scale value. Insulation voltage is rated 800 V, so it's suited for 400 V and 480 V systems with headroom.
Interrupting capacity — what the numbers mean
This MCCB's interrupting capacity varies by system voltage: 440 kA at 240 V AC, 330 kA at both 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. These are the maximum fault currents it can safely clear without welding contacts or rupturing the case. At 690 V the 52.5 kA figure still covers most industrial distribution fault levels; the 440 kA at 240 V is high enough for large transformer secondaries or high-fault utility feeds. A communication function is built in — enables remote monitoring or integration with a building management system via optional modules.
Dimensions and panel fit
Dimensions: 86 mm deep, 105 mm wide, 181 mm tall. Standard DIN-rail or screw-mount footprint for a 3-pole MCCB in a SENTRON distribution board. The 105 mm width matches the usual 4-module spacing on a DIN rail; check your existing busbar or panel cutout for clearance on the 181 mm height.