What this 63 A SENTRON MCCB delivers
The Siemens 3VA1063-3ED42-0DC0 is a 4-pole molded case circuit breaker from the SENTRON family, rated 63 A continuous at 40 °C and designed for line protection. Its breaking capacity drops with system voltage — 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 — so the voltage class of your distribution panel directly determines whether this breaker clears a fault without cascading upstream. The 800 V rated insulation voltage covers 690 V line-to-line systems with margin. This breaker ships with an undervoltage release (UVR) fitted and two HQ auxiliary switches, meaning it can drop the load on loss of control voltage and report its position back to a PLC or status panel without adding external accessories. Maximum power dissipation is 19.8 W — factor that into your enclosure thermal budget if you are grouping several breakers in a sealed cabinet.
Panel fit and thermal derating
The breaker measures 70 mm deep, 101.6 mm wide, and 130 mm high — a standard 4-pole MCCB footprint that mounts on a DIN rail or panel plate. The 63 A rating holds flat from 40 °C to 50 °C (–); above that it derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. If your enclosure ambient runs above 50 °C, size the load or the breaker one frame up.
Selectivity and coordination note
Because the 3VA1063-3ED42-0DC0 is a line-protection design — not a motor-protective or generator breaker — its trip curve is shaped for cable and busbar protection in distribution subfeeds. For motor branch circuits, pair it with a separate overload relay upstream of the contactor; the MCCB handles short-circuit and back-up protection, not running overload.