What this MCCB carries and where it fits
The Siemens SENTRON 3VA1163-5ED32-0CA0 is a 3-pole molded case circuit breaker rated for continuous current of 63 A at 40 °C, with a thermal-magnetic TM210 trip unit designed for line protection. Its interrupting capacity hits 187 kA at 240 V, tapering to 121 kA at 415 V and 75.6 kA at 440 V — numbers that tell you this breaker is built for high-fault panels where SCCR headroom matters. The rated insulation voltage is 800 V, so it handles 480Y/277 V and 600 V class systems without derating the insulation. An integrated undervoltage release (UVR) is included, which means the breaker can be tripped remotely by dropping the control voltage — common in emergency-stop or safety interlock circuits.
Thermal derating and power dissipation in the panel
The 63 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 62 A, at 60 °C to 61 A, at 65 °C to 60 A, and at 70 °C to 58 A. If your enclosure ambient runs above 50 °C, you lose about 1 A per 5 °C rise. Maximum power loss is 19.8 W — modest for a 63 A frame, but worth checking against your panel's thermal budget if you're stacking multiple breakers in a sealed box. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep, which is the standard 3VA1 frame footprint; it clips onto a DIN rail or mounts via the screw terminals.
What the UVR adds to the circuit
The built-in undervoltage release (UVR) trips the breaker when its supply voltage drops below a set threshold. This is standard for applications where you want the breaker to open on loss of control power — think safety circuits, emergency-off chains, or interlocked machine zones. The UVR is factory-integrated, so you don't need a separate accessory module taking up DIN space.