MCCB for line protection with integrated undervoltage release
The Siemens SENTRON 3VA1163-3EF36-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated 63 A continuous at 40 °C, with a maximum breaking capacity of 75.6 kA at 240 V. It is designed for line protection — meaning it sits on the feeder side of a distribution panel, protecting cables and busbars against short-circuit and overload faults. The integrated undervoltage release (UVR) drops the breaker when supply voltage falls below a threshold, which is standard for motor feeder circuits where you need coordinated shutdown on loss of control power.
Breaking capacity across voltages — selectivity planning
Breaking capacity drops as system voltage rises: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. For a 480 V panel (common in North America), the 32 kA at 440 V is the closest published figure — expect SCCR around 30 kA class. That puts it in the range for most commercial and light industrial distribution boards, but verify against your transformer kVA and fault current study. The 11.9 kA at 690 V limits it to lower-fault installations at that voltage.
Thermal derating and panel integration
The 63 A rating holds steady from 40 °C to 50 °C, then derates linearly to 58 A at 70 °C. In a sealed panel with multiple breakers ganged, expect to apply the 58 A figure for worst-case internal ambient. Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — standard 3-pole MCCB footprint for DIN-rail or mounting-plate installation. The 2 HQ auxiliary switches provide status feedback for PLC or SCADA without adding external relays.