What it is and what it does
The Siemens SENTRON 3VA1063-4ED36-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection — the primary job is to protect cables and busbars from overload and short-circuit in a distribution panel. It carries a continuous current of 63 A at 40 °C ambient, and the rating holds steady up to 50 °C before a gentle derate starts (62 A at 55 °C, 60 A at 65 °C, 58 A at 70 °C). That means if your panel runs hot — say a packed enclosure with drives — you still get nearly full ampacity without stepping up a frame size. Breaking capacity is the headline number for a buyer deciding if this breaker clears the fault current at the point of installation. At 240 V it interrupts 121 kA; at 415 V it still handles 75.6 kA; at 440 V it drops to 52.5 kA; at 500 V and 690 V it holds at 11.9 kA. That 121 kA at 240 V is high — it covers most industrial service-entrance and sub-distribution applications where the available fault current is stiff. The 75.6 kA at 415 V is enough for the majority of European 400 V panels.
Panel fit and integration
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that drops into a SENTRON distribution board or a generic DIN-rail enclosure without surprises. The 70 mm depth is shallow enough to clear a 200 mm deep gland plate with room for wiring behind the breaker. This variant ships with a shunt trip (STL) release and two auxiliary switches HQ built in — no separate add-on modules to order and snap on. The shunt trip lets a remote signal (from an E-stop, fire alarm, or PLC) trip the breaker electrically. The two auxiliary switches give status feedback (open/closed) to a controller or indicator lamp. If you need undervoltage release, this order code does not include it — that's a different variant.