63 A MCCB with shunt trip — line protection for distribution panels
The Siemens 3VA1063-4ED32-0JA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in main and sub-distribution panels. Rated 63 A at 40 °C with a 3-pole configuration, it handles feeder and branch circuits up to that continuous current without derating at typical panel ambient temperatures. Its short-circuit breaking capacity reaches 121 kA at 240 V and 75.6 kA at 415 V — sufficient for high-fault installations like industrial switchboards or transformer secondaries where fault currents exceed 50 kA. The 800 V rated insulation voltage covers 480 V and 600 V class systems with margin. The breaker ships with an integrated shunt trip (STL) release for remote tripping via a control signal, and a TM210 thermal-magnetic overcurrent release for overload and short-circuit protection. No undervoltage release or ground-fault monitoring is fitted from the factory.
Breaking capacity by voltage — selectivity planning
At 240 V the 3VA1063-4ED32-0JA0 interrupts 121 kA; at 415 V it handles 75.6 kA; at 440 V it drops to 52.5 kA; and at 500 V and 690 V it is rated 11.9 kA. The steep drop above 440 V means this frame is best applied on systems up to 480 V where the available fault current stays within the 52.5 kA envelope. For 690 V applications the 11.9 kA limit restricts it to low-fault sub-distribution.
Thermal derating and power loss
Rated current holds at 63 A from 40 °C through 50 °C, then derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. Maximum power loss is 17.3 W. In a sealed or high-ambient panel, account for the 5 A drop between 50 °C and 70 °C when sizing the feeder.
Panel fit — dimensions and mounting
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm high. It mounts on a DIN rail or directly to a backplate via the SENTRON mounting base. The 3-pole footprint matches standard SENTRON MCCB cutouts; no rewiring is needed when replacing a same-frame 3VA1 series unit.