63 A 4-pole MCCB for line protection — what the ratings mean on your panel
The Siemens SENTRON 3VA1063-4ED42-0BC0 is a 4-pole molded case circuit breaker (MCCB) rated 63 A at 40 °C, designed for line protection in distribution panels. The 63 A rating holds across 40–50 °C ambient, then derates to 58 A at 70 °C — useful to know if the breaker sits near other heat sources in a crowded enclosure. Breaking capacity reaches 121 kA at 240 V and 75.6 kA at 415 V, so it handles high-fault scenarios on the secondary side of a step-down transformer or a large motor control center bus.
Breaking capacity by voltage — matching the fault level at your bus
This MCCB's interrupting rating varies with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. The 690 V figure is the same as at 500 V, which suggests the arc extinction design reaches its limit above 500 V. For a 690 V line-up, verify the available fault current stays under 11.9 kA — otherwise step up to a higher-rated frame.
Auxiliary and undervoltage release — what ships inside
Factory-fitted with two auxiliary switches (HQ design) and an undervoltage release (UVR). The UVR trips the breaker when control voltage drops below a threshold — common on emergency-stop chains or upstream of a safety contactor. No ground-fault monitoring or communication module on this variant; if you need those, the basic switch order code 3VA10634ED420AA0 is the base platform to start from.
Panel fit — dimensions and mounting
Dimensions are 130 mm height, 101.6 mm width, 70 mm depth — a standard 4-pole MCCB footprint for DIN-rail or screw-mount installation in a distribution board. The 70 mm depth leaves clearance behind the gland plate for wiring tunnels. Rated insulation voltage is 800 V, so it suits 690 V line-to-line systems with margin.