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126kV Disconnector(DS)

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126kV Disconnector(DS) Product Details:

126kV Disconnector or Insolator (DS)

Disconnector (DS) or named as disconnect switch or isolator switch is used to ensure that an electrical circuit is completely de-energised for service or maintenance. Such switches are often found in electrical distribution and industrial applications, where machinery must have its source of driving power removed for adjustment or repair.

High-voltage isolation switches are used in electrical substations to allow isolation of apparatus such as circuit breakerstransformers, and transmission lines, for maintenance.

The disconnector is usually not intended for normal control of the circuit, but only for safety isolation.

Disconnector can be operated either manually or automatically (motorized disconnector).


According to its structure and wheter be equipped with earthing switch, the DS can be divided into various types: non earthing switch, left earthing switch, right earthing switch, double earthing switches.



IEC-129-84 Disconnector and Earthing Switch

GB1985-2004 Disconnector



Ø   It adopts external pressured contact-finger structure, treated with silver plated on its surface.

Ø   New type contact head and finger, larger contacting area enables it to better heat dissipation, eliminate impact from skin effect, good self-cleaning and counter corrosion.  

Ø   Low operation noise

Ø   High reliability

Ø   Good heat radiation effect.

Ø   Easy erection & free maintenance


Application: It is suitable for control and protection of electrical power system, and can also be used as interconnected circuit breaker.   


Typical specification:

Ø   Type: Vertical shrinkable or Horizontal shrinkable

Ø   Highest system voltage: 126kV

Ø   Rated frequency: 50Hz

Ø   Rated current: 2000,3150, 4000,

Ø   Rated peak withstand current(peak) for DS: 100,125KA

Ø   Rated short time withstand current : 40/4, 50/3 KA/s

Ø   Rated 1min power frequency withstand voltage(to earth):230kV

Ø   Rated 1min power frequency withstand voltage(across open contact):230+70kV

Ø   Rated lighting impulse withstand voltage(to earth): 550kv

Ø   Rated lighting impulse withstand voltage: 550+100kv

Ø   Mechanical life: 3000times

Ø   Single pole weight: 260kg

CTSS catalogue is available as per request.

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