Transmit a Contact Closure Over a Single Fiber​

Industrial Media Converters - Contact Closure

This Contact Closure Fiber Link system provides transmission of the contact closure signal over one optical fiber. Applications include alarm event triggering, building automation, environmental control systems, fire & alarm systems, gate control, traffic signal control equipment, and more.

This contact closure system is designed to operate over an extreme temperature range, providing reliability in non-temperature controlled environments. Accepts a wide power input rage of 12 through 48 volts DC allowing for flexibility in installation.


  • Convenient LED status indicators
  • Available with ST connectors
  • Singlemode and multimode options available
  • Input will sense a dry contact closure
  • Output relay is rated to support to 60 Watts
  • Can be powered by 12-48VDC
  • Pluggable terminal blocks
  • Alarm contact for status monitoring
  • Wide operating temp -40°F to +158°F (-40°C to +70°C)
  • Standard T35 DIN rail or wall mountable
  • Limited Lifetime Warranty
  • Made in USA

Multimode: 850nm
Singlemode: 1310nm

Fiber Type/Distance:
Multimode (62.5/125µm, 50/125µm): 1.2 miles (2km)
Singlemode (9/125µm): 9 miles (15km)
Singlemode Long Haul: 29 mi. (48 km), min. required loss *-8dB

*Note: Distances equated using industry standard fiber and connector attenuation of 3dB/Km. Fiber condition, splices and connectors may affect actual range.

Fiber Connector Type:

Steel and Aluminum Alloy, Powder coated

Mounting Style:
Standard DIN rail (TS-35) or wall mount

H4.93” x W1.2” x D3.5” (100mm x 31mm x 89mm)
Not including connectors, Din Clip, or Wall Mount Ears


Operating Temperature:
-40˚F to +158˚F (-40˚C to +70˚C)

Contact Closure System Application
Contact Closure System Application


Lead Time: 1 to 2 Weeks*

For product questions, volume pricing and/or delivery outside of the US and Canada, please contact sales.


Contact Closure

Product configurationTransmitter/ReceiverModeConnectorDistanceFibersPart numberPrice
Transmitter, Multimode, ST, 2km/1.2 miles, Single FiberTransmitterMultimodeST2km/1.2 milesSingle Fiber1CD-03-1$310.00
Receiver, Multimode, ST, 2km/1.2 miles, Single FiberReceiverMultimodeST2km/1.2 milesSingle Fiber1CD-04-1$310.00
Transmitter, Singlemode, ST, 15km/9mi, Single FiberTransmitterSinglemodeST15km/9 milesSingle Fiber1CD-20-1$410.00
Transmitter, Singlemode, ST, 48km/29mi, Single FiberTransmitterSinglemodeST48km/29 milesSingle Fiber1CD-21-1$620.00
Receiver, Singlemode, ST, 15km/9mi & 48km/29mi Single FiberReceiverSinglemodeST15km/9 miles & 48km/29 milesSingle Fiber1CD-22-1$410.00
  • A complete system requires a Transmitter and a Receiver
  • Singlemode receiver is compatible with all singlemode transmitters
  • When a fiber splitter is used, multiple receivers can be paired with one transmitter

*Lead times are estimates and may vary. You will be contacted within 1 business day to go over the details of your order. If you require a specific date, let us know!
*Days = Business Days

WarningWarning: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to

Shopping Cart

We make use of cookies to improve the user experience. By using this website, you agree with our Cookie Policy.