Timeguard Electronic 4 Hour Boost Timer and Fused Spur - FBT4N BoostMaster Fused Spur Countdown Switches now added providing timed output protected by a BS1362 fuse switch. Automatic timed countdown selections to a fail safe OFF using simple push button programming with clear LED output status. Simply replace existing single gang connection units or fixed appliance outlets. Up to 5 ON times can be selected: 1/4hr, 1/2hr, 1, 2 and 4 hours. Automatic timer countdown selection to fail safe OFF. Easy push button selection with clear LED output status. Replaces existing single gang connection unit or fixed appliance outlets.