63 A MCCB with undervoltage release — line protection duty
The SENTRON 3VA1163-4EF36-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated 63 A at 40 °C with a TM240 thermal-magnetic overcurrent release, designed for line protection in distribution panels. It carries a 121 kA breaking capacity at 240 V AC, derating to 75.6 kA at 415 V and 52.5 kA at 440 V — figures that tell you this breaker clears high-fault scenarios without cascading upstream.
The 63 A rating holds flat from 40 °C up to 50 °C, then derates gently — 62 A at 55 °C, 60 A at 65 °C, and 58 A at 70 °C. Power dissipation is 19.8 W maximum — a number worth checking against your enclosure's thermal budget if you're stacking several breakers side by side. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits existing SENTRON 3VA panel cutouts. The 3-pole format with no neutral pole means it's for three-phase line protection (not a 3P+N application).
Integration note — undervoltage release wiring
The factory-fitted undervoltage release (UVR) is wired to the breaker's auxiliary terminals. If you're replacing a plain MCCB without UVR, you'll need to run a control voltage to the UVR coil — typically 24 V DC or 230 V AC depending on the release variant ordered.