MCCB for line protection with high interrupting capacity
The Siemens 3VA1163-4EF32-0CC0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection duty, carrying 63 A continuous current through three poles with a TM240 thermal-magnetic release. Its interrupting capacity hits 121 kA at 240 V and 75.6 kA at 415 V — figures that give selectivity headroom in a main or feeder position without cascading upstream. The TM240 release is a fixed thermal-magnetic type — no electronic adjustment, no communication module, no ground-fault monitoring. That keeps the part simple and reliable for standard distribution panels where you need a known trip curve and don't want configuration risk on the line.
Thermal derating and ambient temperature
This MCCB holds its full 63 A rating from 40 °C up to 50 °C ambient. Above that, the thermal element begins to derate: 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 sits near a heat source or in a non-conditioned enclosure, check the actual ambient against that curve — the breaker will trip earlier than the 63 A label suggests.
Undervoltage release and auxiliary contacts
Factory-fitted with an undervoltage release (UVR) that drops the breaker when control voltage falls below a threshold — typical for safety circuits or emergency-stop chains that need to guarantee a disconnect on power loss. The auxiliary contact version carries two HQ (high-amp) auxiliary switches, part number 3VA9608-0BB24 for the integrated trip block. No separate trip indicator on the front face.
Panel fit and environmental limits
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or screw-mounted panel layouts. Front protection is IP40, so it's fine for dry indoor enclosures but not washdown zones. Operating range from -25 °C to 70 °C; storage from -40 °C to 80 °C.