What this MCCB carries and where it fits
The Siemens SENTRON 3VA1163-5EF36-0HA0 is a 3-pole molded case circuit breaker rated for 63 A continuous at 40 °C, with a TM240 thermal-magnetic release and an integrated shunt trip (STL) for remote tripping. Its 187 kA breaking capacity at 240 V AC means it can safely interrupt very high fault currents at typical North American line voltages — a figure that drops to 121 kA at 415 V and 75.6 kA at 440 V, still well above what most distribution panels will ever see. The 800 V rated insulation voltage tells you the internal clearances and creepage are sized for 690 V industrial systems, not just 480 V commercial gear. This is a line-protection design, so it is intended for feeder or main breaker duty, not motor branch-circuit protection with an overload relay. The 70 mm depth and 130 mm height keep it within the standard SENTRON 3VA1 panel footprint — it will fit existing 3VA1 mounting bases and busbar connections without re-drilling. The 76.2 mm width is a three-module (3 x 25.4 mm) form factor, so it occupies three positions on the DIN rail or panel-mount plate.
Shunt trip and release detail
The shunt trip (STL) auxiliary release allows remote tripping by applying a control voltage to the release coil — useful for emergency-stop circuits, PLC-driven load shedding, or interlocking with a fire-alarm panel. There is no undervoltage release on this variant, so the breaker holds closed without a separate control supply. The TM240 overcurrent release is a thermal-magnetic type with a fixed thermal element and magnetic pickup calibrated for the 63 A frame — no field-adjustable trip unit, which simplifies specification but locks the protection curve.
Thermal derating and operating range
The 63 A rating holds flat from 40 °C to 50 °C (–). Above that, derating is gradual: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C (–). The maximum operating temperature is 70 °C, with storage from -40 °C to 80 °C. Maximum power loss at rated load is 17.3 W — negligible for panel heating calculations in a ventilated enclosure.