MCCB with line-protection design and integrated undervoltage release
The Siemens SENTRON 3VA2063-5HN32-0CH0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full ambient range from -25 °C to 70 °C, with no derating needed up to 70 °C. The line-protection design (thermal-magnetic trip curve) means it's tuned for cable and busbar protection rather than motor starting — pair it with a contactor for motor circuits. Factory-fitted undervoltage release (UVR) drops the breaker on loss of control voltage — typical for emergency-stop chains or undervoltage protection schemes.
Interrupting capacity and selectivity planning
The 75.6 kA at 500 V and 3 kA at 690 V cover the less common 500 V and 690 V distribution tiers — the sharp drop at 690 V means it's not a primary choice for 690 V main breakers unless the available fault is under 3 kA.
The 105 mm width (4.13 in) matches the 3-pole frame footprint for this series; verify the existing busbar tap centers if retrofitting into a non-Siemens panel.