Transmit 8 Contact Closures Over a Single Fiber​

Industrial Media Converters - 8 Channel Contact Closure
8 Channel Contact Closure

The RLH 8 Channel Contact Closure DIN Fiber Link system provides a transmission of up to eight independent contact closure signals over one optical fiber. The system comprises a transmitter module and a receiver module, each in a compact DIN mount housing.

The system requires a 24~56VDC local power source at each end to provide power. The RX module includes a NC/NO alarm contact for system monitoring. Fiber optic cable is immune to RF noise, high voltages, and provides a transmission range of up to 15km/ 9 miles.

The DIN mount is designed to be installed onto a standard T35 (35mm) DIN rail.


  • Hardened to operate in -40°C to +70°C (-40°F to +158°F)
  • Can be powered by 24~56VDC
  • Convenient LED status indicators
  • Receiver includes alarm contacts for status monitoring
  • Input power is not polarity sensitive
  • Available in Single or Multimode
  • Convenient DIN Rail or Wall Mount
  • Limited Lifetme Warranty
  • Made in the USA

Steel and Aluminum Alloy, powder coated

Mounting Style:
Standard DIN rail (TS-35)

Multimode: 850nm
Singlemode: 1310nm
SM Long Haul: 1310nm

Fiber Type/Distance:
Multimode (62.5/125µm, 50/125µm): 6dB / 1.2 miles (2km)
Singlemode (9/125µm): 8dB / 9 miles (15km)
Singlemode Long Haul: 24dB* / 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.


H5.0” x W1.9” x D3.5” (127mm x 48mm x 89mm) – Not including connectors
Not including DIN bracket

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

8 Channel Contact Closure Application
8 Channel Contact Closure Application


Lead Time: 1 to 2 Weeks*

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


8 Channel Contact Closure

Product configurationTransmitter/ReceiverModeConnectorDistanceFibersPart numberPricehf:att:pa_mode
Transmitter, Multimode, ST, 2km/1.2 mi , Single FiberTransmitterMultimodeST2km/1.2 milesSingle Fiber8CD-03-2$640.00
Receiver, Multimode, ST, 2km/1.2 mi , Single FiberReceiverMultimodeST2km/1.2 milesSingle Fiber8CD-04-2$640.00
Transmitter, Singlemode, ST, 15km/9mi, Single FiberTransmitterSinglemodeST15km/9 milesSingle Fiber8CD-20-2$950.00
Receiver, Singlemode, ST, 48km & 15km, Single FiberReceiverSinglemodeST15km/9 milesSingle Fiber8CD-22-2$740.00
  • A complete system requires one Transmitter and one Receiver
  • 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

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