An apparatus is a wiring item that pertains to different types of wiring devices. These are multi-purpose wiring devices that accept wires and signals, for example, barriers, opto-couplers, relays, repeaters, isolators, and so forth.
An apparatus is a wiring item that pertains to different types of wiring devices. These are multi-purpose wiring devices that accept wires and signals, for example, barriers, opto-couplers, relays, repeaters, isolators, and so forth.