63 A MCCB for motor protection — what the ratings mean for fit
The Siemens 3VA2163-7MN32-0AF0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) designed specifically for motor protection, with a continuous current rating of 63 A that holds flat across the full 40 °C to 70 °C ambient range — no derating needed in a warm enclosure. Its interrupting capacity reaches 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V — figures that tell you this breaker is built for high-fault-current industrial distribution, not light commercial service. The motor-protection design includes phase failure detection, a trip indicator, and a 1 auxiliary switch plus 1 trip alarm switch (HQ type) for remote status feedback.
Panel fit and integration
The 3-pole breaker measures 105 mm wide, 181 mm high, and 86 mm deep — a compact footprint that fits standard 3-pole MCCB panel cutouts and leaves room for side-mounted auxiliary wiring. Operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C; maximum power loss is 4 W, manageable in a sealed enclosure without forced ventilation. The basic switch variant is order code 3VA2163-7MN32-0AA0, and this unit ships with the HQ auxiliary switch block pre-installed — no field assembly required for the alarm contact.