How to read Circuit Breaker? (MCB)?

Question

On the circuit breaker unit.

There is 20A MCB SPN

There is also 10A MCB TPN

and also 15A MCB DP

can someone tell me whats the difference between SPN, TPN, DP what it stands for?

Answer 1

a)MCB =Miniature circuit breaker

b)SPN=Single pole and neutral ( 1 terminal for live and 1 terminal for Neutral cable  for wire connection. Pole refers to a  power  cable connection  on the MCB)

c)TPN=Triple Pole & Neutral (ie. altogether 4 cable input and 4 cable out from the MCB)

d) DP refers to Double Pole (with no specific neutral  terminal.Still one pole may be used for that.

The A refers to  rated  Current in amperes.

Also important is ( i)  the  rated voltages  which will  govern the   given in Amperes.(ii) Duty  it is meant for eg. lighting , motor power etc. (Motor duty   for eg is A3). Also whether AC or  C supply.

Answer 2

the (mcb) is miniature circuit breaker

SPN is Single Pole w/neutral

DP is double pole

TPN is tripple pole w/neutral

most residential breakers are sp and dp mcp's  does this help