SPN is a Two device with second pole as Neutral & TPN is a four pole device with fourth pole as Neutral. In TPN opening & closing will open & close the Neutral. Natural is meant to isolate the pole, TPN MCB is used in 3 phase 4 wire system. It is denoted as TP+N which means a 3 pole device with external neutral link which can be isolated if required.
Available in Single Phase + Neutral (SPN) &
Three Phase + Neutral (TPN)
Ratings in 6A, 10A, 16A, 20A, 25A, 32A, 40A & 63A
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