11

ApplicationSurge arrester designed toprotect 12 and 24 kV classcomponents, includingtransformers, equipment, cableand accessories from highvoltage surges resulting fromlightning or switching.

Up to 24 kV

156SAINTERFACE A

SURGE ARRESTER

Technical characteristics• This surge arrester is a metal

oxide varistor surge arrester inan elbow configuration.

• Each arrester is tested forAC withstand and partialdischarge prior to leaving thefactory.

Surgearrester

type

Nominaldischarge

currentIn (kA)

Ratedvoltage

Ur(kV)

Max. continuousoperatingvoltageUc (kV)

Steep currentresidual

voltage @ 5 kA[1/20 µs] (kV)

Lightning currentresidual

voltage @ 5 kA[8/20 µs] (kV)

High currentimpulse

withstand(kA)

156SA-12156SA-15156SA-18156SA-21156SA-24

55555

1519222630

12.515.518.021.024.5

62.577.087.0

101.5116.5

54.569.079.093.5108.5

4040404040

6/10 (12) kV6.35/11 (12) kV8.7/15 (17.5) kV

12/20 (24) kV12.7/22 (24) kV

DesignSurge arrester comprising:

1. Bail restraint.2. Conductive EPDM insert.3. Type A - 250 A interface

as described by CENELECEN 50180 and 50181.

4. Pin contact.5. Contact disc.6. Copper shunt.7. Metal oxide valve elements.8. Aluminium spacer.9. Steel cap.

10. Earth connection.11. Insulating EPDM layer

moulded between the insertand the jacket.

12. Conductive EPDM jacket.

12

11

9

10

5

2

6

3

4

5

8

6

1

7

12

Typical application anddimensions

Ordering instructionsTo order the surge arrester,specify the surge arrester type,as described on previous page.

Example:For a maximum continuousoperating voltage (rms) of 21 kV.Order a 156SA-21 surgearrester.

330

K400TE/G orK400TB/Gconnector

K400RTPAreducing tap plug

220 195

156

131

415

Surge arrester156SA-24