Type ‘FTS’ Fault Throwing Switches
The switch portion is rotating double break disconnector to which has been added a closing spring toggle, which in the closed ‘straight-line’ position locks the switch closed to prevent bounce and throw open by theshort-circuit forces encountered on closing. At near ground level is positioned the spring close mechanism in a weatherproof galvanised housing. This also contains two powerful closing springs which in the service position are restrained by a lever released by a trip solenoid. An adjustable length of galvanised pipe couples the mechanism to a clevis on the switch. The MLE type FTS will make (without welding) closed on to a fault of up to40kA peak, withstand 20kA for 1 second, and is rated up to 72.5kV.