What this MCCB is and what it does
The Siemens SENTRON 3VA2163-6HL36-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from -25 °C to 70 °C — no derating needed up to that ceiling. It is designed for line protection in distribution panels and switchgear assemblies, with a breaking capacity that starts at 242 kA at 240 V and holds at 187 kA through 415–440 V, then drops to 121 kA at 500 V and 3.7 kA at 690 V. That 242 kA at 240 V figure is the headline: it handles very high available fault currents typical at the secondary of a large step-down transformer, so this breaker belongs upstream in a feeder, not downstream on a branch circuit. The unit ships with an undervoltage release (UVR) built in, plus two auxiliary switches and one trip-alarm switch (HQ type). The UVR means the breaker automatically opens when control voltage drops below a threshold — common in emergency-stop chains or mains-monitoring schemes where loss of control power must trip the feeder.
Panel fit and mounting
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. That 86 mm depth is the body only — account for handle throw and wiring bend radius when laying out the gland plate. The breaker mounts to a mounting plate or DIN rail via the SENTRON 3VA base adapter; wire lug clearance on a 63 A frame is standard for 50 mm² Cu cable. Power loss at rated load is 6.5 W maximum — negligible for thermal budgeting inside a ventilated enclosure, but worth noting if the panel is sealed and densely packed.