A Passive Coupler is a device which has been designed and manufacturedfor the purpose of transferring PLC signals from one phase to another.Transfer PCL signal across different phase in a 3 phase power system.Home Plugs connected in different phase can now communicate.Fit for DIN Rail standard.Easy Installation.Internal fuse for protection.Broadband of coupling frequency.Low attenuation.Compatible with all brand of Home Plug devices.1 x Phase Coupler