What this 63 A MCCB delivers
The Siemens SENTRON 3VA1163-6EF32-0JA0 is a 3-pole molded case circuit breaker rated for 63 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. Its interrupting capacity hits 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V — figures that give a site electrical engineer serious selectivity headroom in high-fault panels. At 690 V it still clears 17 kA, which matters for industrial loads fed from step-up transformers. The breaker carries a shunt trip (STL) release as standard — the auxiliary trip order code is 3VA9688-0BL32 — but no undervoltage release, no auxiliary contacts, no communication module, and no ground-fault monitoring. It's a pure line-protection device: no bells, no remote status. The TM240 release means the thermal element is calibrated for 240 A frame, but the breaker itself is rated 63 A; the magnetic pickup is fixed and non-adjustable on this variant. Thermal derating is modest: full 63 A holds from 40 °C through 50 °C, then drops 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 the panel ambient runs hot, the effective ampacity is still above 56 A — enough for most 60 A feeder taps. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.
Panel fit and lifecycle
Mechanical endurance is rated at 15,000 operations — typical for a 63 A MCCB in distribution duty, not a motor-switching role. The front face carries IP40 protection, so it's suited for enclosed panel mounting where no hose-down or dust ingress is expected. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits Siemens 3VA busbar adapters and panel cutouts. Rated insulation voltage is 800 V (Ui), and the reference code per DIN EN 81346-2 is Q (switching device). No phase-failure detection, no communication function, no voltage trigger beyond the shunt trip — this is a straightforward thermal-magnetic breaker with a remote trip coil for emergency-off or undervoltage schemes wired externally.