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.
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.