The Siemens SENTRON 3VA1163-4EF36-0HC0 is a 3-pole molded case circuit breaker (MCCB) for line protection, rated 63 A continuous at 40 °C with a breaking capacity of 121 kA at 240 V. That 121 kA at 240 V means it handles high available fault currents common in industrial distribution panels — think secondary side of large step-down transformers feeding a plant floor. The interrupting rating drops to 75.6 kA at 415 V and 52.5 kA at 440 V, so verify the fault current at your service voltage before specifying.
Current derating and thermal limits
Full 63 A rating holds steady from 40 °C up to 50 °C. Above that it derates gradually: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at the maximum operating temperature of 70 °C. If the breaker sits in a warm enclosure — say a non-ventilated panel near other heat sources — use the 60 °C or 65 °C column for realistic ampacity. The maximum power loss is 17.3 W, which contributes to internal cabinet heating.
Built-in accessories: shunt trip and auxiliary switches
This variant ships with a shunt trip (STL) release factory-installed and two auxiliary switches (HQ type). The shunt trip allows remote tripping from a safety circuit or emergency-stop button — a common requirement for automated lines. Two auxiliary contacts give status feedback (open/closed) to a PLC or indication lamp without add-on modules. No undervoltage release is fitted on this unit, so if you need undervoltage protection (UV release) for motor starter coordination, select a different option code.
Integration and physical fit
Dimensions are 130 mm tall, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that mounts on a DIN rail or directly to a backplate via screw terminals. The rated insulation voltage is 800 V, so it's suitable for 690 V line-to-line systems common in European and Asian industrial networks. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.