CA01082E_Catalog 30

Products – Porcelain Housed Surge Arresters – MH3/MH4

MH3/MH4 Part Numbers

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) 0.25 (7) - 0.81 (21) 0.38 (10) - 1.12 (29) 0.16 (4) - 1.25 (31)

Code

A B H

Step 2: Select the max system voltage (Um)

Step 7: Ground Terminals A – Standard

Ground Size - in (mm)

Code

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

0.25 (7) - 0.81 (21) 0.38 (10) - 1.12 (29) 0.16 (4) - 1.25 (31)

A B H

Step 5: Select Ur

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

Site Pollution

Code

Medium (≥ 20 mm creep per kV Um) Heavy (≥ 25 mm creep per kV Um) Very Heavy (≥ 31 mm creep per kV Um)

M

H V

Page 56 | October 2023