2 Channel isolation relay board. Use the isolation (opto-isolation) interface board to drive your 

relays and protect your PLC, or HAVC systems.

Simply connect the isolation board to the relay board as shown power of any of our 24VAC "Calss 2" or "Power" transformer mount and power it--and you're in business. 

Use the isolation (opto-isolation) interface board to drive your relays and protect your PLC, or HAVC systems.

Note in the configuration above the relays are "on" when the input signal are low (close to zero volt Dc or AC). The corresponding relay turn off when the input signal goes "hi" i.e 10 to 36V AC or DC.

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