Federal Signal’s TELB TelCom® Extension Ringer Bell is a vibrating bell activated by the ringing signal of a telephone system. The TELB is specifically designed for use with an analog telephone. The ringing signal of 40-150VAC, 16-60Hz and local 120VAC power is all that is required to activate a TelCom signal.
This TelCom device is intended to be mounted on a vertical surface such as a rigid wall or post. The TELB has a threeconductor six-foot, 120VAC power cord extending from the unit. Connecting the TelCom device to the telephone network is done by running a modular telephone line cord (RJ11) to an existing jack or a duplex jack (customer supplied) into an existing modular jack. The TELB is designed with a durable zinc die-cast housing painted with gray powder coat enamel, and features an internal solid-state relay.
TelCom devices are designed for high ambient noise areas such as manufacturing facilities, machine and sheet metal shops. They are also useful in large open areas such as a warehouse, loading dock, or a large office.


Voltage 120VAC
Mount Wall
Operating Current 0.08 Amps
Operating Temperature Minimum 32 °F
Operating Temperature Maximum 112 °F
Decibel Output 98 at 10 Feet
108 at 1 Meter
Ringing Signal 90VAC, 20Hz
Ring Detection 15.8 - 60Hz, 40-150VAC
Humidity Range 0 - 85% R.H. Noncondensing (Storage and Operating)
Enclosure Rating Type 1
Humidity Range (Storage and Operating) 0 to 85% R.H, noncondensing
Net Weight 2.6 lbs
Shipping Weight 3.2 lbs
Height 5.100 in
Width 4.530 in
Depth 4.730 in

Ordering Information

Model Types
Model Description UPC
TELB-120 TelCom 4" bell, 120VAC 782979203001