Rev. 2 - 03/03
EMERGENCY CALL SWITCH
The Alpha Communications® SF117/3B Emergency Switch
is designed for emergency-call systems that need to
interface to a customer supplied smoke detector (form 'C')
relay output, and features a rugged, long-life, positive-
acting switch mounted on a durable ABS plastic faceplate.
Signaling an emergency requires just a short pull on the 6'
long nylon cord, in any direction. The signal cannot be
canceled except at the point of origin.
The SF117/3B provides the circuits to operate signaling
devices, such as a remote annunciator lamp, a corridor
dome lamp, floor bell(s), individual apartment electric door
openers, and smoke detector relay interfaces, as needed.
The SF117/3B features a rugged, long-life, positive-acting
switch mounted on a flame retardant type ABS plastic
faceplate marked "EMERGENCY", with a special diode
network to allow for the smoke detector relay interface.
If a 'call placed' or 'call assurance' capability is required, we
recommend that you use our model #SF118/3B pull cords,
which have a built-in Red L.E.D. 'call placed' indicator.
Height: 4.50" (114mm) (less cord)
Width: 2.75" (70mm)
1.50" (38mm) (into wall)
White ABS plastic.
SF117/3B - 4PDT with special diode
network for smoke detector interface
Positive screw terminals
Standard single-gang electrical box
"EMERGENCY" in Black Letters
6 foot long (can be shortened in field),
made of durable Nylon.
Refer to system wiring diagram IL514 for more complete
Due to continuous product improvement, all colors, sizes, materials,
finishes and specifications are subject to change without notice.
ARCHITECTS' AND ENGINEERS'
The Emergency Call switch shall be Alpha Commu-
nications®/Tektone model SF117/3B or approved
equal with pull cord operated switch, mounted on a
durable ABS plastic faceplate, marked "EMER-