63 A MCCB with 121 kA interrupting capacity — line protection for distribution panels
The Siemens SENTRON 3VA1163-4EE46-0AA0 is a 4-pole molded case circuit breaker rated 63 A at 40 °C, designed for line protection in low-voltage distribution. The TM220 thermal-magnetic trip unit handles overload and short-circuit faults without external control power. Breaking capacity reaches 121 kA at 240 V AC, tapering to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500/690 V — enough for high-fault utility feeds or transformer secondaries. Rated insulation voltage is 800 V, so it can be applied in 480/277 V and 600/347 V panels with headroom. Power loss at full load runs 17.3 W maximum — factor that into enclosure thermal calculations when grouping several breakers. The breaker mounts in a standard distribution panel or enclosure; front-face protection is IP40, meaning tools or fingers won't reach live parts but the unit is not sealed against moisture. Operating range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C.
Dimensions and panel fit — 70 mm depth, 101.6 mm wide, 130 mm tall
The breaker occupies 101.6 mm width per pole (about 4 in), 130 mm height (5.12 in), and 70 mm depth (2.76 in). Four-pole unit so it needs the full 101.6 mm mounting width; depth stays within standard enclosure clearances for 63 A frame MCCBs.