What this MCCB is and what it carries
The Siemens SENTRON 3VA2163-5MN32-0DC0 is a 3-pole molded case circuit breaker (MCCB) designed specifically for motor protection, rated at 63 A across the full 40 °C to 70 °C ambient range — no derating needed up to that ceiling. Its interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V — the 415 V figure is the one most plant engineers will use for coordination studies on 400 V class systems. The breaker ships with an undervoltage release (UVR) and two HQ auxiliary switches built in; the basic switch core is order code 3VA21635MN320AA0.
Motor protection features and panel fit
This MCCB includes phase failure detection — a critical feature for motor loads where a lost phase can single-phase a winding before the overload relay notices. Dimensions are 105 mm wide, 181 mm high, and 86 mm deep, fitting standard SENTRON 3VA panel footprints and busbar systems without adaptor plates. Maximum power loss is 6.5 W, which keeps thermal rise manageable in a sealed enclosure; operating range spans -25 °C to 70 °C, storage from -40 °C to 80 °C.