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. Interrupting capacity hits 187 kA at 240 V and 121 kA at 415 V, giving substantial fault-current headroom for industrial distribution panels. 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. Auxiliary contact block carries 2 auxiliary switches plus 1 trip alarm switch (HQ type), enough for remote status feedback without an add-on module.
Interrupting capacity and selectivity planning
At 415 V the 121 kA interrupting rating places this MCCB well above the typical 50–65 kA available fault current in most LV switchboards, so it can serve as a main or tie breaker without cascading upstream. 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.
Panel fit and mounting dimensions
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — fits standard Siemens SENTRON 3VA2 panel cutouts and busbar systems. 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.