The Siemens 3VA1163-4EF32-0AC0 is a SENTRON molded case circuit breaker rated for 63 A continuous current with a TM240 thermal-magnetic overcurrent release. Its interrupting capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that tell you the fault energy this thing can clear without venting the panel. That 121 kA at 240 V is the headline number for most industrial distribution boards; the 75.6 kA at 415 V covers the common European 400 V three-phase bus.
Thermal derating and panel fit
The breaker holds its full 63 A rating up to 50 °C ambient, then derates to 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If your enclosure runs hot — near a furnace line or a bank of drives — that derating curve is what you size the feeder for, not the 63 A nameplate. The 70 mm depth and 76.2 mm width mean it fits standard panel-mount cutouts; the height is 130 mm. No trip indicator and no undervoltage release on this variant, so if you need those, the auxiliary contact version here carries 2 HQ auxiliary switches.