What this MCCB is and what it does
The Siemens SENTRON 3VA2163-6HL36-0JH0 is a 3-pole molded case circuit breaker rated for 63 A continuous current, designed for line protection in distribution panels and industrial switchgear. Its breaking capacity ranges from 242 kA at 240 VAC down to 3.7 kA at 690 VAC — the 242 kA figure at 240 V means it can safely interrupt a fault current up to that level without upstream devices needing to clear it, which is critical for high-fault locations like service entrances or transformer secondaries. This breaker carries a shunt trip release (STL) and comes factory-fitted with two auxiliary switches plus one trip alarm switch HQ — so it can signal its status back to a PLC or annunciator panel without an add-on module. The trip indicator and voltage trigger are both present, meaning you get local mechanical indication and the ability to remote-trip via the shunt coil.
Thermal performance and derating
The breaker holds its full 63 A rating from 40 °C all the way up to 70 °C ambient — no derating needed across that range. That's unusual for an MCCB; many competitors start dropping current above 40 °C. If your panel runs hot near the top of the enclosure, this part keeps its full ampacity. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power loss is 4 W — negligible for thermal budgeting inside a crowded panel.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — a standard SENTRON 3VA form factor that drops into the same mounting footprint as other 3VA frame sizes. The 86 mm depth means it fits shallow backpanels where a deeper MCCB would conflict with a rear door or busbar shroud. The basic switch variant is 3VA2163-6HL36-0AA0, so if you're replacing just the switching mechanism without the trip unit, that's the sub-assembly to order.