The Shelly AC-to-DC Signal Decoupler allows an AC control signal to safely trigger a DC input on compatible Shelly devices. It is designed for installations where existing AC switches, relays, or control circuits need to interface with low-voltage DC inputs without exposing the device to mains voltage.

By providing electrical isolation between AC and DC circuits, the decoupler enables safe signal conversion in mixed-voltage installations. It is commonly used in retrofit scenarios where traditional AC switches must interact with Shelly devices that expect DC control signals.