What this MCCB carries — and what that means for your panel
The Siemens SENTRON 3VA1163-3EF32-0KH0 is a 3-pole molded case circuit breaker rated for 63 A continuous current at 40 °C, with a thermal-magnetic release (TM240) tuned for line protection. The 75.6 kA breaking capacity at 240 V means it can safely interrupt a fault up to that level without cascading upstream — a key number for SCCR compliance in a distribution panel.
Breaking capacity across voltages — selectivity planning
Breaking capacity drops as voltage rises: 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. If your fault-current study shows a higher prospective short-circuit at your system voltage, this breaker may not coordinate — verify the point-of-common-coupling level before committing the BOM line.
Thermal derating — real-world current handling
Full 63 A holds through 50 °C ambient. Above that, it derates: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If the panel runs hot — near a VFD bank or transformer — size the load to the derated figure, not the nameplate 63 A.
Lifecycle and sourcing posture
The lifecycle stage is current — this is an active, in-production part. It ships with a shunt trip (STL) and 2 auxiliary switches plus 1 trip alarm switch HQ. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.
Mounting and enclosure fit
Dimensions: 70 mm deep, 76.2 mm wide, 130 mm tall. Front face carries IP40 protection — suitable for a closed panel, not a washdown area. The 76.2 mm width (roughly 3 inches) matches standard MCCB mounting footprints; verify the backplate cutout against your existing DIN-rail or panel-mount pattern.