Siemens SENTRON 3VA1063-4ED36-0DA0 — 63 A MCCB with Undervoltage Release
The breaker carries a rated insulation voltage of 800 V and delivers a short-circuit breaking capacity of 121 kA at 240 V AC, 75.6 kA at 415 V, and 52.5 kA at 440 V — sufficient for high-fault-current installations where selectivity and arc-flash coordination matter.
Current Derating and Thermal Performance
Rated current holds at 63 A from 40 °C up to 50 °C, then derates linearly: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. This means the breaker can be installed in a warm enclosure or alongside other heat-generating devices without losing full rating until ambient exceeds 50 °C. Maximum power loss is 19.8 W, which should be accounted for in enclosure thermal calculations — particularly in sealed or high-density panels.
The MCCB measures 130 mm high, 76.2 mm wide, and 70 mm deep — a compact 3-pole footprint that fits standard Siemens SENTRON 3VA mounting bases and panel cutouts.