What this MCCB is and what it does
The Siemens 3VA2163-5HN32-0CL0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — the primary role of this class is to protect cables and distribution feeders against overload and short-circuit faults in low-voltage switchgear and panelboards. Rated 63 A continuous at 40 °C through 70 °C, it holds its full ampacity across the entire operating temperature band, which simplifies derating calculations in warm enclosures. Three-pole construction suits three-phase feeders. The 86 mm depth, 105 mm width, and 181 mm height (–) fit standard panel layouts — expect it to occupy the same footprint as other 3VA2 frame breakers, so a panel cut for that family accepts this unit without re-drilling the mounting plate.
Panel integration and wiring notes
Mounts in a standard MCCB cutout — the 105 mm width and 181 mm height match the 3VA2 frame envelope. Line and load lugs accept copper or aluminum conductors per Siemens termination specs. The undervoltage release requires a separate control voltage; verify polarity and voltage rating against the coil nameplate before energizing. Auxiliary switches are wired to the terminal block on the breaker face; they share the same compartment as the UVR, so keep control wiring segregated from power conductors to avoid induced noise on the alarm circuit. Operating temperature range -25 °C to +70 °C covers most indoor industrial environments; storage range -40 °C to +80 °C allows unheated warehouse staging. Maximum power loss 6.5 W is low enough that no forced cooling is needed in a standard IP54 enclosure, but account for it in the overall thermal budget if the panel is densely packed.