The Siemens SENTRON 3VA1163-4EF32-0AD0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection, rated 63 A continuous at 40 °C ambient and carrying a TM240 thermal-magnetic overcurrent release. The interrupting capacity hits 121 kA at 240 V and still delivers 75.6 kA at 415 V, so it handles high-fault utility feeds without cascading upstream — critical for main switchboard or large subfeed applications where SCCR headroom is tight.
What the ratings mean for fit
The 63 A frame holds its rating flat from 40 °C through 50 °C, then derates to 58 A at 70 °C — a thermal curve that matters when the breaker sits in a crowded panel near other heat sources. The TM240 release means the thermal pickup is fixed at 240 A (roughly 3.8x the frame rating), so it's sized for feeder protection where the inrush of downstream motor loads or transformers won't nuisance-trip, but it's not adjustable for coordination studies that need a tighter band. Rated insulation voltage is 800 V, and the interrupting ratings at 500 V and 690 V both hold at 11.9 kA — that's the ceiling for this pole configuration. If your system runs 480 V or 600 V class, the 52.5 kA at 440 V gives a conservative benchmark; the 11.9 kA at 690 V confirms it's usable on 690 V IT networks but with reduced fault-handling. Power loss is 17.3 W max at rated load — negligible for thermal budgeting in a ventilated enclosure, but worth noting if the panel is sealed and densely packed.
Panel integration
Dimensions are 70 mm deep, 76.2 mm wide, and 130 mm tall — a compact 3-pole MCCB footprint that fits standard distribution panelboards and motor control center buckets. The 76.2 mm width (3 inches) is the critical dimension for bus-stack spacing; verify the existing mounting base accepts the 3VA family's lug or plug-in connections before committing the BOM line.