What this 63 A MCCB is and what the ratings mean for fit
The Siemens SENTRON 3VA2163-7MS32-0AD0 is a 3-pole molded case circuit breaker (MCCB) in the starter protection version — meaning it is built to switch and protect motor loads, not just general distribution. The 63 A rated continuous current (Iu) holds at ambient temperatures up to 50 °C without derating; above that it steps down 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. That thermal profile matters if this breaker sits in a warm enclosure — the 63 A nameplate is real only up to 50 °C. The breaking capacity is the headline number for fault protection: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. Those are high-interrupting ratings — this breaker can safely clear a fault on a large transformer or a motor branch with very high available fault current. The rated insulation voltage is 800 V, so it is rated for 690 V systems with margin.
Integration — what fits where
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep. That width is standard for a 3-pole SENTRON 3VA frame — it occupies one 105 mm slot on a DIN rail or panel-mount plate. The depth of 86 mm means it clears most standard enclosure depths, but check gland-plate clearance if the panel is shallow. The auxiliary contact version is 3 auxiliary switches HQ, and the integrated auxiliary trip is order code 3VA9608-0BB24. The supplied basic switch is 3VA2163-7MS32-0AA0.
Overcurrent release and trip unit
The overcurrent release is the ETU310M — an electronic trip unit with adjustable settings for motor protection. There is no undervoltage release, no shunt trip (voltage trigger), no ground-fault monitoring, and no communication function. The trip indicator is not present, so a remote indication of trip status would need to come from the auxiliary switches. Phase failure detection is not built in, but the ETU310M typically handles phase unbalance through its thermal model.
Environmental limits
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 75 W — that is the heat it dumps into the enclosure at full rated current, so factor that into your thermal calculation if the panel is tightly packed. Mechanical endurance is 20,000 operations.