Timeguard fst77 supplymaster 7 day timer fused spur timeguard fst77 p the timeguard fst77 supplymaster 7 day fused spur timeswitch is a unit which mounts onto a bs 4662 flush mount single box or a bs 5733 surface mount single box 25mm deep in either case there is provision for a single front exit output cable with in built cable clamp p p the unit combines the facilities of a time switch and a double pole switched fused connection unit capable of being wired directly into a ring m