63 A MCCB, 4-Pole, Line Protection
The Siemens SENTRON 3VA1063-2ED42-0JH0 is a 4-pole molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a TM210 thermal-magnetic release for line protection duty. It carries a breaking capacity of 52.5 kA at 240 V and 32 kA at 415 V, which means it can safely interrupt high fault currents on a 400 V distribution bus without upstream coordination issues. The shunt trip (STL) auxiliary release allows remote tripping from a PLC or E-stop circuit, and the integrated 2 auxiliary switches plus 1 trip alarm switch (HQ) provide status feedback to the control system.
Thermal Derating Curve — What It Means for Panel Loading
This MCCB holds its full 63 A rating up to 50 °C ambient. Above that, the TM210 release 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 runs hot — say, a packed enclosure with drives — the 55 °C figure is the one to size against. The breaker's IP40 front protection means it's fine in a clean indoor panel but not for washdown zones. Mounting dimensions: 70 mm depth, 101.6 mm width, 130 mm height — fits standard 4-pole MCCB footprints on a DIN rail or panel-mount base.
Breaking Capacity Across Voltages
The interrupting rating drops as voltage rises: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 690 V. For a 400 V three-phase panel, the 32 kA figure is the one that matters for SCCR compliance. The rated insulation voltage is 800 V, so it's suitable for 690 V line-to-line systems where the available fault current stays under 7.5 kA.