63 A MCCB with 187 kA interrupting capacity — motor protection variant
The Siemens 3VA2163-5MN32-0BH0 is a 3-pole SENTRON molded case circuit breaker rated for 63 A continuous current at 40 °C. Its interrupting capacity hits 187 kA at 240 V, then steps down through 121 kA at 415/440 V, 75.6 kA at 500 V, and 17 kA at 690 V — a voltage sweep that matters when you are coordinating downstream devices across a mixed-voltage distribution board. This is the motor protection version, fitted with an ETU350M electronic trip unit. It includes phase failure detection and an undervoltage release (UVR) as standard — so the breaker trips on loss of phase or a sag below the UVR dropout threshold, which is the kind of protection a motor branch circuit needs before the contactor welds shut. Thermal derating is published from 40 °C through 70 °C: the breaker holds 63 A up to 50 °C, then drops to 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If your panel ambient runs hot, that curve tells you exactly where you lose headroom.
Panel fit and auxiliary wiring
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard SENTRON 3VA2 footprint that drops into the same DIN-rail or mounting-plate cutout as other 3VA2 frames. The auxiliary contact block ships as 2 auxiliary switches plus 1 trip alarm switch (HQ configuration), wired separately from the main power path. Maximum power loss is 75 W at rated current. That heat has to leave the enclosure — factor it into your thermal budget alongside the downstream contactor and overload relay.
Sourcing and compliance
Rated insulation voltage is 800 V, which covers 690 V systems with margin. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The breaker carries the SENTRON brand and is designed to IEC/EN 60947-2. No communication function is built in — this is a standalone protective device, not a power meter or communicator.