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why we use 4 pole contactor instead of three pole ? and what is basic difference between 3pole and 4pole on the basis of there application?

why we use 4 pole contactor instead of three pole ? and what is basic difference  between 3pole and 4pole on the basis of there application?

Grade:12th Pass

1 Answers

Sourabh Singh IIT Patna
askIITians Faculty 2104 Points
8 years ago
Based on the number of poles, the breakers are classified as

SP – Single Pole
SPN – Single Pole and Neutral
DP – Double pole
TP – Triple Pole
TPN – Triple Pole and Neutral
4P – Four Pole

1. SP ( Single Pole ) MCB:

In Single Pole MCCB, switching & protection is affected in only one phase.
Application: Single Phase Supply to break the Phase only.

2. DP ( Double Pole ) MCB:

In Two Pole MCCB, switching & protection is affected in phases and the neutral.
Application: Single Phase Supply to break the Phase and Neutral.

3. TP ( Triple Pole) MCB:

In Three Pole MCB, switching & protection is affected in only three phases and the neutral is not part of the MCB.
3pole MCCB signifies for the connection of three wires for three phase system (R-Y-B Phase).
Application: Three Phase Supply only (Without Neutral).

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