What this MCCB is and what the ratings mean
The Siemens SENTRON 3VA2163-7MS36-0AD0 is a 3-pole molded case circuit breaker (MCCB) in the starter protection product version, meaning it is configured for motor branch-circuit protection rather than general distribution. Its rated continuous current Iu is 63 A, and it carries that rating from 40 °C up to 50 °C without derating; at 55 °C it holds 60.48 A, and at 70 °C it still delivers 56.7 A — useful when the breaker is packed into a warm panel next to contactors and drives. The headline breaking capacity is 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 the interrupting ratings at the respective system voltages — the 330 kA figure at 240 V covers the high-fault scenario typical on the secondary side of a large step-down transformer. The rated insulation voltage Ui is 800 V, so the breaker is physically rated for 690 V line-to-line systems with margin. It ships with an ETU310M electronic trip unit (the overcurrent release design), which provides adjustable thermal-magnetic or electronic protection curves depending on the trip unit variant. The auxiliary contact version is 3 auxiliary switches HQ — these are high-qualified contacts for signaling the breaker state back to a PLC or safety relay.
Panel fit and integration
Dimensions are 181 mm high, 105 mm wide, 86 mm deep. The width is the critical fill-factor number for a multi-breaker lineup on a DIN-rail or panel-mount backplate — 105 mm per pole set means three of these occupy 315 mm of rail width. The 86 mm depth leaves clearance behind a standard 200 mm deep enclosure door. Maximum power loss is 75 W, so plan for heat dissipation if the breaker is in a sealed sub-panel. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The latching endurance is 20 000 operations, which is typical for a motor-protection MCCB subject to occasional switching rather than daily cycling.