RY-AC Aiphone Call Extension Relay The RY-AC Aiphone relay is used to activate an external doorbell, buzzer, or signalling device when a call is received. It can be used for call extension on the LEF, TD-H, TD-Z and IE-8MD systems. Some features of RY-3DL Aiphone
Allows an external device to be triggered when the intercom is called
External device will be activated momentarily as long as the call button on the door station is activated
