Circuit-breaker: Difference between revisions
From Electrical Installation Guide
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{{Menu_LV_switchgear_functions_and_selection}} | {{Menu_LV_switchgear_functions_and_selection}} | ||
{{Highlightbox| | {{Highlightbox| | ||
The circuit-breaker/disconnector fulfills all of the basic switchgear functions, while, by means of accessories, numerous other possibilities exist | 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. | |||
As shown in {{FigureRef| | |||
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. | 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" | {| class="wikitable" | ||
|- | |- | ||
! Functions | ! colspan="2" | Functions | ||
! | ! colspan="2" | Possible Conditions | ||
|- | |- | ||
| Isolation | | colspan="2" | Isolation | ||
| | | {{tb-square}} | ||
| | | | ||
|- | |- | ||
| | | rowspan="3" |Control | ||
| Control | |||
| Functional | | Functional | ||
| | | {{tb-square}} | ||
| | |||
| | |||
|- | |- | ||
| Emergency switching | | Emergency switching | ||
| | | {{tb-empty-square}} | ||
| (With the possibility of a tripping coil for remote control) | |||
|- | |- | ||
| Switching-off for mechanical maintenance | | Switching-off for mechanical maintenance | ||
| | | {{tb-square}} | ||
| | |||
|- | |- | ||
| | | rowspan="4" | Protection | ||
| Protection | |||
| Overload | | Overload | ||
| | | {{tb-square}} | ||
| | |||
|- | |- | ||
| Short-circuit | | Short-circuit | ||
| | | {{tb-square}} | ||
| | |||
|- | |- | ||
| Insulation fault | | Insulation fault | ||
| | | {{tb-empty-square}} | ||
| (With differential-current relay) | |||
|- | |- | ||
| Undervoltage | | 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) | |||
| Indication and measurement | |||
| | |||
| | |||
|} | |} | ||
{{Section-TOC}} | |||
{{ | |||
}} | |||
Latest revision as of 09:48, 22 June 2022
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.
Fig. H20 – Functions performed by a circuit-breaker/disconnector
| Functions | Possible Conditions | ||
|---|---|---|---|
| Isolation | ☑ | ||
| Control | Functional | ☑ | |
| Emergency switching | ☐ | (With the possibility of a tripping coil for remote control) | |
| Switching-off for mechanical maintenance | ☑ | ||
| Protection | Overload | ☑ | |
| Short-circuit | ☑ | ||
| 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) | |
