The Siemens SENTRON 3VA2063-8KP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, with an ETU850 electronic trip unit for line protection. It carries a 440 kA interrupting rating at 240 V AC, stepping down to 330 kA at 415 V and 52.5 kA at 690 V — high enough for most main or feeder breaker positions in industrial switchgear where fault currents are substantial.
Interrupting capacity and what it means for your panel
The 440 kA at 240 V is the maximum short-circuit current this MCCB can safely interrupt without welding contacts or rupturing the case. At 415 V (common industrial three-phase) it still holds 330 kA, and at 690 V it drops to 52.5 kA. For a 63 A frame, those numbers are well above typical available fault currents in most distribution panels — meaning you have headroom for selectivity coordination downstream without worrying about the breaker failing open on a bolted fault. The ETU850 is an electronic trip unit with communication capability, so it can report trip events, current draw, and status over a network — useful for a maintenance team that wants to know why a feeder tripped without walking the panel.
Physical fit and panel integration
Dimensions: 86 mm deep, 140 mm wide, 181 mm tall. That's a standard 4-pole MCCB footprint for a 63 A frame — mounts on a DIN rail or directly to a backplate via the screw terminals. The IP40 rating on the front means it's protected against tools and wires >1 mm, but not against water ingress; keep it inside a closed panel or enclosure.