| Appendix A - Types of Switches |
|
| SPST Switch |
|
 "Closed" circuit (ON) |
"Open" circuit (OFF) |
|
| SPDT Switch |
|
 Circuit B - "Closed" (ON)
Circuit A - "Open" (OFF) |
 Circuit A - "Closed" (ON)
Circuit B - "Open" (OFF) |
|
| SPDT SWITCH (CENTER-OFF) |
|
 Both A & B circuits are "OPEN" (Both are OFF) |
|
| DPST SWITCH |
|
 Circuits A & B are both "OPEN"
(both circuits are OFF) |
 Circuits A & B are both "Closed"
(both circuits are ON) |
|
| DPDT SWITCH |
|
 Circuits B & D - "Closed" (ON)
Circuits A & C - "Open" (OFF) |
 Circuits A & C - "Closed" (ON)
Circuits B & D - "Open" (OFF) |
|
| DPDT SWITCH (CENTER-OFF) |
|
 All four circuits are "OPEN" (OFF) |
|
