CA01082E_Catalog 30

30 - ARRESTERS - PRODUCTS

Porcelain Housed Surge Arresters – MH3/MH4

M

H

4

3

6

2

G

M

2

7

6

A A

Step 6: Line Terminals A – Standard

Step 1: Select the IEC classification 3 = Class Station Medium (SM) 4 = Class Station High (SH)

Line Size in (mm)

Code

0.25 (7) - 0.81 (21)

A

0.38 (10) - 1.12 (29)

B

Step 2: Select the max system voltage (Um)

0.16 (4) - 1.25 (31)

H

Step 7: Ground Terminals A – Standard

Step 3: Configurations G – Gray Housing (standard) B – Brown Housing U – Underhung F – Fault Indicator

Ground Size in (mm)

Code

0.25 (7) - 0.81 (21)

A

0.38 (10) - 1.12 (29)

B

0.16 (4) - 1.25 (31)

H

Step 4: Select the appropriate site pollution level from the table below

Site Pollution

Code

Medium ( ≥ 20 mm creep per kV Um)

M

Step 5: Select Ur

Heavy ( ≥ 25 mm creep per kV Um)

H

Very Heavy ( ≥ 31 mm creep per kV Um)

V

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