What this MCCB carries — and what it doesn't
The Siemens SENTRON 3VA2063-5HL36-0JA0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating curve to chase. It's designed for line protection, meaning it sits upstream protecting a feeder or distribution bus, not a specific motor or load group. The shunt trip (STL) auxiliary release lets you remotely trip the breaker via a control signal, which is useful for emergency-off or supervisory shutdown circuits. Breaking capacity is the headline: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA figure at 240 V tells you this breaker can handle a high-fault-current panelboard feed where the available fault current is substantial. The 121 kA at 415 V still covers most industrial distribution scenarios. The 3 kA at 690 V is a drop — if you're on a 690 V system, verify the available fault current is under that limit.
Mounting and panel fit
Footprint is 105 mm wide by 181 mm tall by 86 mm deep. That 105 mm width is three pole spaces on a standard DIN-rail or panel-mount grid — no surprises for a 3-pole MCCB. The 86 mm depth means it clears most shallow enclosures, but check your gland-plate clearance if the breaker is mounted near the back wall. Rated insulation voltage is 800 V, so the internal clearances are sized for 690 V systems without additional creepage concerns.