What this MCCB carries and where it fits
The Siemens 3VA1163-5EF32-0CC0 is a SENTRON 3VA1 molded case circuit breaker (MCCB) rated for line protection in distribution panels. It is a 3-pole unit rated 63 A continuously at 40 °C, with a thermal derating curve that holds 63 A through 50 °C and drops to 58 A at 70 °C — useful when the breaker sits in a warm enclosure near other heat sources. Breaking capacity is 187 kA at 240 V AC and 121 kA at 415 V AC, which means it can safely interrupt very high fault currents typical at the service entrance or in high-capacity sub-distribution boards. The 800 V rated insulation voltage (Ui) confirms it is suitable for 480/277 V and 600 V systems with adequate margin. This variant ships with an undervoltage release (UVR) and two auxiliary switches (HQ configuration) factory-installed. The UVR trips the breaker when control voltage drops below a threshold — common in emergency-stop circuits or to prevent automatic reclosure after a power loss. The auxiliary switches provide status feedback (open/closed) to a PLC or indication lamp.
Panel fit and dimensions
The breaker measures 76.2 mm wide (3 in), 130 mm tall (5.12 in), and 70 mm deep (2.76 in). The 3-pole width matches standard MCCB panel cutouts and bus-bar spacing for 3-phase systems. The 70 mm depth includes the handle and auxiliary switch housing — verify clearance to the enclosure door or dead-front cover.