What are the differences between types 1, 2 & 3 surge aresters?
Type 1 & 2 surge arresters are installed directly under the incoming breaker ( in parallel with the distribution breakers ). We use Type 1 when there's a lightning bolt installed on the building roof. When there's not, we use Type 2.
Type 3 is installed in parallel with the sensitive loads ( Computers, printers...etc. )
See attached catalogues for all types.