Siemens SENTRON 3VA1063-4ED36-0BC0 — 63 A MCCB with 121 kA interrupting capacity
The Siemens SENTRON 3VA1063-4ED36-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 63 A at 40 °C and an interrupting capacity of 121 kA at 240 V — that figure drops to 75.6 kA at 415 V and 52.5 kA at 440 V, so verify the available fault current at your service voltage before committing the BOM line. Rated insulation voltage is 800 V, and the breaker includes an undervoltage release (UVR) as part of the auxiliary release design, which means it can be wired into a safety circuit that trips the breaker on loss of control voltage — common in emergency-stop or undervoltage protection schemes. Thermal derating is minimal up to 50 °C (still 63 A), then drops to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C — so for a panel running at 60 °C ambient you lose only 2 A of headroom.
Integration and mounting
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — fits standard panel-mount cutouts for 3-pole MCCBs in the 63 A frame class. The auxiliary switch design accommodates two HQ auxiliary switches, and the breaker ships with the basic switch 3VA10634ED360AA0 — verify the auxiliary contact configuration matches your control circuit wiring before panel integration.