What this MCCB carries — and what it protects
The Siemens 3VA1163-3EF32-0DA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It's rated 63 A continuously at 40 °C and holds that rating through 50 °C; above that it derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C (–). That thermal curve means in a hot panel — say near a furnace line or a drive cabinet with poor airflow — you lose only 5 A at 70 °C, which keeps the breaker in the circuit without upsizing. Breaking capacity is the real spec that decides fault clearance: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. On a 480 V distribution bus (common in North American industrial plants), the 32 kA at 440 V figure is the closest published — expect it to handle typical 480 V panel SCCR requirements up to 25–30 kA without cascading upstream. Rated insulation voltage is 800 V, so the breaker's internal clearances are sized for 690 V line-to-line systems. This is a 3-pole unit with an integrated undervoltage release (UVR). The UVR design means the breaker trips when control voltage drops below a threshold — essential for safety circuits that need to drop power on loss of control supply. The overcurrent release is a TM240 thermal-magnetic type, so it provides both thermal (overload) and magnetic (short-circuit) protection in one package. No ground-fault monitoring and no communication function — this is a straightforward line-protection breaker, not a metering or remote-trip device.
Panel fit and mounting
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm high — that's 2.76 in × 3 in × 5.12 in (–). The 76.2 mm width is a standard 3-inch footprint for a 3-pole MCCB, so it fits existing SENTRON or competitive panel cutouts without modification. Depth of 70 mm means it clears most standard enclosure gland plates and backpan depths; no special deep-can enclosure required. Maximum power loss is 19.8 W — modest for a 63 A breaker, so heat buildup in a densely packed panel is manageable. Operating temperature range is −25 °C to 70 °C; storage range is −40 °C to 80 °C. That storage floor matters if the breaker sits in an unheated warehouse or a cold-climate shipping container.