63 A MCCB with undervoltage release — what the ratings mean for your panel
The Siemens SENTRON 3VA1063-3ED32-0CH0 is a 3-pole molded case circuit breaker rated 63 A at 40 °C, designed for line protection in distribution panels. That 63 A holds flat from 40 °C through 50 °C, then derates gradually to 58 A at 70 °C — so in a warm enclosure you still get nearly full ampacity without oversizing the frame. The 3-pole construction handles three-phase feeders, and the integrated undervoltage release (UVR) drops the breaker if control voltage is lost, which is standard for emergency-stop or safety-shutdown circuits where loss of coil power must open the main contacts.
Breaking capacity across the voltage range
This MCCB delivers 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 steep drop above 440 V means it is best suited for 240 V to 415 V distribution — at 690 V the 7.5 kA rating limits its use to low-fault-current subpanels or transformer-fed loads. The 800 V rated insulation voltage confirms it can be installed on 690 V systems, but the interrupting rating governs the application.
Auxiliary contacts and trip indication
The breaker ships with 2 auxiliary switches plus a trip alarm switch (HQ), and a visible trip indicator on the front. That means you get remote status of the main contacts (open/closed) plus a separate signal for fault tripping — useful for PLC-based monitoring or annunciator panels. The undervoltage release is factory-fitted, so no field assembly needed.
DIN-rail footprint and panel fit
At 70 mm deep, 76.2 mm wide, and 130 mm tall, it fits standard DIN-rail enclosures. The 76.2 mm width (3 inches) is a common 3-pole MCCB footprint — matches existing busbar and terminal layouts without re-drilling gland plates. Rated for -25 °C to 70 °C operating ambient, with storage from -40 °C to 80 °C.