The circuit-breaker/disconnector fulfills all of the basic switchgear functions, while, by means of accessories, numerous other possibilities exist
As shown in Figure H20 the circuit-breaker/ disconnector is the only item of switchgear capable of simultaneously satisfying all the basic functions necessary in an electrical installation.
Moreover, it can, by means of auxiliary units, provide a wide range of other functions, for example: indication (on-off - tripped on fault); undervoltage tripping; remote control… etc. These features make a circuit-breaker/ disconnector the basic unit of switchgear for any electrical installation.
|Emergency switching||☐||(With the possibility of a tripping coil for remote control)|
|Switching-off for mechanical maintenance||☑|
|Insulation fault||☐||(With differential-current relay)|
|Undervoltage||☐||(With undervoltage-trip coil)|
|Remote control||☐||Added or incorporated|
|Indication and measurement||☐||(Generally optional with an electronic tripping device)|