What this MCCB brings to the panel
The Siemens SENTRON 3VA1063-3ED42-0BA0 is a 4-pole molded case circuit breaker (MCCB) rated 63 A at 40 °C, designed for line protection in distribution panels. Its TM210 thermal-magnetic overcurrent release handles overload and short-circuit protection without a separate trip unit. The 75.6 kA breaking capacity at 240 V means it can safely interrupt high-fault currents upstream of sensitive branch circuits — critical for selectivity coordination in a main or sub-feed position. An undervoltage release (UVR) is built in, so the breaker trips automatically when supply voltage drops below a set threshold — useful for motor branch circuits that need to restart only after a confirmed power restoration. The 800 V rated insulation voltage gives headroom for 690 V line-to-line systems.
Breaking capacity across the voltage range
Breaking capacity drops as voltage climbs: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. That 7.5 kA at 690 V is the figure to check if this breaker serves a 690 V motor control center — it's adequate for most MCC applications but verify against the transformer's nameplate fault current.
Thermal derating and panel integration
Current rating 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. In a sealed, uncooled enclosure that hits 60 °C ambient, you lose 2 A — plan the load accordingly. The 70 mm depth, 101.6 mm width, and 130 mm height fit standard SENTRON panel footprints; the 19.8 W maximum power loss needs ventilation if multiple breakers are ganged.