Trip all phase switch-fuse combined units are available up to and including 36kV, 400A 25kA/3secs.
To overcome the problems associated with ‘single phasing’ caused when only one fuse in a supply blows, MLE have developed a unique system. The design is designated a ‘TRIP-ALL PHASE UNIT’ (T.A.P.).
The principle of operation is that in the event that one or more of the TAP fuses blow, the fuse (or fuses) will swing downwards and strike a tripping bar. The tripping bar will release a spring-charged mechanism, which in turn will open the switch and isolate all 3 phases.
The switch can also be operated manually for normal switching operations.
Type FTS Fault Throwing Switches (Cat. No. FTS/15)