What this MCCB delivers on the line
The Siemens SENTRON 3VA1163-4EF32-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. It is a line-protection device, meaning it guards cables and busbars against overload and short-circuit — not a motor-protective breaker with integrated phase-loss detection. The interrupting ratings are substantial: 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V, so it can handle high-fault-current scenarios like large transformer secondaries or main feeders in industrial distribution. The undervoltage release (UVR) is built in, and the auxiliary contact version carries 2 HQ switches (form C) for status feedback to a PLC or annunciator panel.
Derating and thermal reality
This breaker holds full 63 A up to 50 °C ambient. Above that, it derates linearly: 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 your panel runs hot — say a packed enclosure near a furnace line — you lose about 6 A by 70 °C. The rated insulation voltage is 800 V, and the operating temperature range is -25 °C to 70 °C. Storage range is wider: -40 °C to 80 °C. The front face carries IP40 protection, so it's fine in a clean panel but not for washdown areas.
Physical fit and integration
The case measures 76.2 mm wide, 130 mm high, and 70 mm deep. That width is a standard 3-pole MCCB footprint — it will drop into a SENTRON 3VA panel base or a DIN-rail adapter without surprises. The auxiliary trip is a separate order code (3VA9608-0BB25) if you need shunt or UVR wiring. No communication module or ground-fault monitoring is built in; this is a straight thermal-magnetic breaker with a UVR coil.