View source for Circuit-breaker

{{Menu_LV_switchgear_functions_and_selection}}
{{Highlightbox|
The circuit-breaker/disconnector fulfills all of the basic switchgear functions, while, by means of accessories, numerous other possibilities exist}}

As shown in {{FigureRef|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.

{{tb-start|id=Tab1265|num=H20|title=Functions performed by a circuit-breaker/disconnector|cols=3}}
{| class="wikitable"
|-
! colspan="2" | Functions 
! colspan="2" | Possible Conditions 
|-
| colspan="2" | Isolation
| {{tb-square}}
|
|-
| rowspan="3" |Control
| Functional
| {{tb-square}}
|
|-
| Emergency switching
| {{tb-empty-square}}
| (With the possibility of a tripping coil for remote control)
|-
| Switching-off for mechanical maintenance
| {{tb-square}}
|
|-
| rowspan="4" | Protection
| Overload
| {{tb-square}}
|
|-
| Short-circuit
| {{tb-square}}
|
|-
| Insulation fault
| {{tb-empty-square}}
| (With differential-current relay)
|-
| Undervoltage
| {{tb-empty-square}}
| (With undervoltage-trip coil)
|-
| colspan="2" | Remote control
| {{tb-empty-square}}
| Added or incorporated
|-
| colspan="2" | Indication and measurement
| {{tb-empty-square}}
| (Generally optional with an electronic tripping device)
|}

{{Section-TOC}}