What this MCCB is and what it does
The Siemens SENTRON 3VA2063-8HN46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, built for line protection in distribution panels. It carries a 440 kA breaking capacity at 240 V AC — that's the maximum fault current it can safely interrupt at that voltage, which matters for high-fault installations like industrial substations or large motor control centers. The ETU350 electronic overcurrent release gives you adjustable trip curves, so you can coordinate selectivity downstream without swapping trip units.
Dimensions and panel fit
The breaker measures 86 mm deep, 140 mm wide, and 181 mm tall — that's a standard 4-pole MCCB footprint for a 63 A frame. It's designed for screw-mounting in a distribution panel or enclosure. The IP40 front protection means it's splash-safe from the front but not sealed against hose-down; keep it inside a cabinet for washdown areas.
Breaking capacity across voltages
The interrupting rating drops as voltage rises: 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. That 52.5 kA at 690 V is still solid for most industrial 690 V systems — you'd only need higher if you're feeding a large transformer or a high-fault bus. The 63 A continuous rating holds flat across the full ambient range from 40 °C to 70 °C, so no derating needed in a warm enclosure.
Key specs at a glance
Rated insulation voltage is 800 V. Power loss is 3 W maximum — negligible for panel thermal budgeting. Storage range is -40 °C to 80 °C; operating range is -25 °C to 70 °C. No undervoltage release, no communication function, no ground-fault monitoring version built in — this is a straight line-protection breaker. The ETU350 release is the electronic trip unit with LSI protection (long-time, short-time, instantaneous).