SP – Single Pole – No link/pole is provided for Neutral.
SPN – Single Pole Neutral Link – Two Poles, but for the Neutral Pole a link is provided.
TP - Tripple Pole – No link/pole is provided for Neutral.
TPN – Tripple Pole Neutral Link – Four Poles, but for the Neutral Pole a link is provided.
DP – Double Pole – Two Poles; one for Phase and the other for Neutral
FP – Four Pole – Four Poles; three poles for the three phases and fourth for Neutral
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