http://www.futureelectronics.com/en/Search.aspx?dsNav=Ny:True,Nea:True,N:557 - During this video, we'll explain what is a Signal Relay as well as how to select the right one for your application from our line-up of Signal relay products.
Signal relays are used for low Level current switching, often below 2A but up to 40A. Applications include AC Control, Communications, Security, Measurement Equipment, Audio Visual Devices and Automotive applications. http://youtu.be/wTf4f39O9X8
