Few realize how close an optical coupler resembles a relay. It is so close ... Note that the optocouplers must have a CTR (current transfer ratio) greater than 100% or else the circuit cannot latch.

WIXOM -- The Wixom manufacturing electronics manufacturer Acromag has released new BusWorks XT Series multi-channel optocouplers and interposing relay modules ... 5-24V logic circuits to operate ...

1. The well-established relay-driving circuit uses an optocoupler to isolate the grounds and noise coupling between the low-voltage digital-control signal circuit (left) and the relay as load (right).

Murrelektronik optocouplers, slim interface relays and multi-mode relay timers are now available from AutomationDirect. Murrelektronik optocouplers (from $16.50) are used to combine different signal ...

“These multi-channel discrete contact sensor and relay output modules offer ... “By adding optocouplers and relays, you can use PLC, DCS, or remote I/O modules with 5-24V logic circuits to operate ...