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For a 2-position selector switch, connect incoming power to the common terminal and send each position’s output to its own load or control input.
For the full breakdown, see our best 2 Position Selector Switch guide.
The logic behind a 2 position selector switch wiring diagram is simple: one common terminal carries the supply in, and two output terminals each feed a separate load. In the first position, output 1 is energized; in the second, output 2 takes over. That one pattern covers AUTO/MANUAL selection, lamp switching, and two-load control, and both Fortress Safety and AutomationDirect document it.
What A 2-Position Selector Switch Wiring Diagram Shows
A 2-position selector diagram maps one shared input to two switched outputs. The common terminal is the entry point for the incoming line or DC supply, and the two output terminals are the contacts that energize separate loads, lamps, or PLC inputs. Only the selected circuit is live at a time.
| Terminal | Wire It To | Role In The Circuit |
|---|---|---|
| Common (C or COM) | Incoming line, phase, or +24 VDC | Shared supply input for both positions |
| Output 1 | Load 1, lamp 1, or PLC input 1 | Energized only in position 1 |
| Output 2 | Load 2, lamp 2, or PLC input 2 | Energized only in position 2 |
| Return / neutral (illuminated models) | Lamp or load return | Wired directly, not through selector contacts |
| N/O contact | Load or input active in the selected position | Closed only when the selector is in that position |
| N/C contact | Load or input active in the alternate position | Open in the selected position, closed otherwise |
| Cam-operated contacts | Terminals per the model’s diagram | Cam code defines which contacts change at each detent |
Fortress Safety’s operating instructions cover three common configurations: N/O non-illuminating, N/O illuminating, and N/O & N/C non-illuminating. Fortress Safety’s 2-position selector switch instructions include