Impulse Relay (Latching Relay) Basic Function, Wiring and Application. 

In this video tutorial, we will learn the basic function, wiring and application of a impulse relay.
Impulse relays, which are often referred to as bi-stable relays, are a form of latching relay that changes the contact state with each voltage input pulse..
A latching relay is an alternative control device for lighting system application. It can be used for as an additional device to control a lighting circuit in many points or location. Compare to traditional 3 way and four way switches, adding or extending the control points with impulse relay are more convenient and easy.