Edwards Signaling 251-F7 Series - Manual (Page 2)

Wiring for two to ten FailSafe
GuardSwitches
™ in series
Add a 1/2 amp fast-acting fuse in series to protect the switch from premature failure
caused by inrush-currents, tampering, or excessive vibration.
White
Black
Red
White
FailSafe
GuardSwitch
FailSafe
GuardSwitch
FailSafe
GuardSwitch
VAC/DC
Load
1/2A Fuse Required
Black
Red
Red
Black
White
* Use fast-acting Littlefuse 216, fast-acting Microfuse or
fast-acting Pico II fuse up to 1/2 Amp.
Mounting Configurations
Perpendicular
Actuation
*
Door
Actuation
Parallel
Actuation
OK OK NO
Rotated
Actuation
OK
* Actuation surface
Wiring for one FailSafe GuardSwitch ™
Add a 1/2 amp fast-acting fuse * in series to protect the switch from premature failure
caused by inrush-currents, tampering, or excessive vibration.
* Use fast-acting Littlefuse 216, fast-acting Microfuse or
fast-acting Pico II fuse up to 1/2 Amp.
Black
Red 1/2A Fuse Required* FailSafe
GuardSwitch
Load
VAC/DC
White
Figure 2
Three configurations are appropriate for interlock applications. The parallel actuation can result in on/off/on signal if the actuator passes by the switch rather than coming to
rest in proximity to it. This is NOT a recommended configuration for interlock applications.
Figure 3 Figure 4
P/N 11939 • REV E • REB 15MAR13