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 | 1 channel 12V Relay Module, Opto-coupler isolated, for Arduino and MCU projects. GBP 3.5 Category : General Purpose Relays Seller : easybuy-123(1314, 99.4%) |  | 4 Pin DIP Photo Darlington Output Optocoupler, 50mA, 5KV, - FOD852 GBP 3.49 Category : Optocouplers Seller : rapidwarehouse-office(59281, 98.5%) |