Timeguard FST77 7Day Fused Time Switch. The Timeguard Brand Is Renowned For Its Excellent Quality And Reliability. With Lines Ranging From Lighting, Through Time Switches, To Rcd Protection, Being A Popular Choice With Electricians, You Know When You Choose Timeguard You Are Getting A Great Product That Offers Great Value For Money.The Timeguard Fst77 Is A 7 Day Fused Spur Time Switch. It Is Simple To Use As All The Buttons Are Clearly Marked And There Are Two Led Indicators So You Can See Clearly When It Is On. The Fst77 Has An Optional 1 Or 2 Hour Boost Facility And An Automatic Summer/Winter Time Changeover. It Has A Large Lcd Screen And Is Compatible With Up To 3Kw Immersion Heaters. Residual Current Device.