An intermediate toggle switch is used when you have three switches controlling one light. A typical example of this is on a landing. There is a switch at the bottom of the stairs, one at top of the stairs and one at the end of the landing. On this circuit you would need the middle switch to be intermediate (i.e. the one at the top of the stairs) in order for all the switches to function properly.
Perfect finishing touch to any modern home, flawless Screwless low profile metal design with matching dimmer cap.
NB: DO NOT USE IN A MIXED ENVIRONMENT i.e. difference brands of lamps or different wattages of lamps in same fitting