The Siemens SENTRON 3VA2040-8JQ42-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous current, designed for line protection in distribution panels. It carries a 60–480 A adjustable thermal-magnetic trip range, so it can be set to match the downstream load without swapping the breaker body — useful when the same physical unit needs to cover multiple branch sizes across a line. Breaking capacity reaches 440 kA at 240 V AC, 330 kA at 415/440 V, 220 kA at 500 V, and 52.5 kA at 690 V — figures that cover most industrial service-entrance and feeder applications. The 800 V rated insulation voltage confirms it can be used in 690 V systems without derating the insulation path. A built-in communication function and summation ground-fault monitoring (L+N conductor) make this breaker suitable for networked power distribution where remote trip indication or leakage detection is needed. No undervoltage release or voltage-trigger accessory is included on this variant.
Dimensions and panel fit
Footprint: 140 mm wide × 181 mm tall × 86 mm deep. The 140 mm width means it occupies four standard 35 mm DIN-rail module slots — confirm backpanel space if replacing an existing 3-pole breaker that left room for a neutral link. Operating temperature range –25 °C to +70 °C; storage from –40 °C to +80 °C. Rated current holds at 40 A across the full 40–70 °C band without derating — no need to upsize for a warm cabinet.