JW7 Single Column HV AC Earthing Switch
Product Characteristics
For this series of earthing switch, the voltage ranging from 40.5kV to 550kV, JW7 earthing switch, with single column, includes three mono poles and each of them is presented as the single column structure. The earthing switch is composed of the base, the supporting insulator, the earthing circuit, the operating mechanism, etc.The earthing switch of each pole is installed at the lower part of the supporting insulator and the fixed contact is installed at the upper part of the supporting insulator.
Product Parameters

No.

Name

Unit

JW7-40.5

JW7-72.5

JW7-126

JW7-1 45

JW7-252

JW7-363

JW7- 420

JW7-550

JW7-800

JW7-1100

1

Rated voltage

kV

40.5

72.5

126

145

252

363

420

550

800

1100

2

Rated current

A

630 / 1250

3

Rated short-time withstand current and duration

kA/s

40/4

40/4

40/4

40/4

50/3

63/3

63/3

63/3

63/3

63/3

4

Rated peak withstand current

kA

100

100

100

100

125

160

160

160

170

170

5

Rated power frequency withstand voltage, 1min

kV

95

160(181)

230(260)

275

460

510(653)

520

740

960

1230

Rated lightning impulse withstand voltage

( 1.2/50 s )

kV

185

380(396)

550(622)

315

1050

1175(1504)

1425

1675

2100

2690

Rated switching impulse withstand voltage

kV

/

/

/

/

950(1140)

1050

1300

1550

1860

Note: The value shown in the bracket is the Max. offered value of our product.