LV Switchgear
The basic functions of LV Switchgear
The role of lv switchgear is:
1. Electrical protection
2. Safe isolation from live parts
3. Local or remote switching
National and international standards define the manner in which electric circuits of LV installations must be realized, and the capabilities and limitations of the various switching devices which are collectively referred to as lv switchgear.
The main functions of lv switchgear are:
- Electrical protection
- Electrical isolation of sections of an installation
- Local or remote switching
Electrical protection at low voltage is (apart from fuses) normally incorporated in circuit-breakers, in the form of thermal-magnetic devices and/or residual-current operated tripping devices (less-commonly, residual voltage- operated devices – acceptable to, but not recommended by IEC).
In addition to those functions above, other functions, namely:
- Over-voltage protection
- Under-voltage protection
are provided by specific devices (lightning and various other types of voltage-surge arrester, relays associated with contactors, remotely controlled circuit-breakers, and with combined circuit-breaker/isolators… etc)
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