: They offer better contact area, reduce panel clutter, and handle higher currents (e.g., matching a 63A main switch ).
: High-quality brands like ABB or Legrand may allow input from either side, but keeping a consistent "top-in, bottom-out" pattern across the panel is crucial for safety and easier troubleshooting. 2. Linking Multiple Breakers
: Pin-type (universal pole structure) and Fork-type (U-shaped for screw terminals).