¡¡ |
¡¡ |
¡¡ |
One pole: provide protection against surge
current of circuit single phase 220V.
Two poles: provide protection against surge current of L and N
phase to earth of circuit single phase 220V resulted from
lightning.
Three poles: provide protection against surge current of S phase
of TT, TN-S system 380V, and also protect S to earth of IT TN-C
system of 380V.
Four poles: provide protection against surge current against S,
N to earth of TT TN-S system of 380V. |
|