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. An integrated undervoltage release (UVR) is fitted as standard, so the breaker trips on loss of control voltage, which matters for safety circuits that require a drop-out on power loss.
What the ratings mean for your panel
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. That means in a warm enclosure you lose only about 8 % capacity at the top end, not a cliff. The 800 V rated insulation voltage (Ui) is generous for 400 V class systems, giving headroom for grounded-wye or corner-grounded delta configurations. 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). Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.
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. The UVR trips the breaker when its supply drops below about 35 % of rated voltage, and prevents reclosure until the control voltage is restored. That makes it a fit for emergency-stop circuits or undervoltage protection schemes where you want the breaker to stay open after a power loss until manually reset.