The difference between a tpn mccb and a 4 pole mccb is rather negligible. The only real difference is that a 4 pole mccb works a little bit faster and allows for a strong network connection. The connection with a 4 pole mccb is just a bit more reliable.
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TPN mean Triple Pole(TP)+ Neutral(N)which is 3 phases and neutral ,but the protection is given for three phases only and in 4 pole MCB protection is given to all 3 phases as well as neutral..
The main difference between the two is that a TP isolator is only a "triple pole" isolator. A TPN isolator is a "triple pole" and neutral isolator.
TPN MCB means Triple pole Neutral Miniature Circuit Breaker where as SPN MCB means single phase Neutral MCB.
The difference of TP and TPN in circuit breakers is the ability of the switch to hold a neutral position. With TPN, a neutral switch position is not possible. With TP, the breaker can be held in a neutral position.
The difference between 16A TP and 16A TPN isolator is the type of the circuit breaker that is used. The terminal design is the other difference.
TPN stands for Triple Pole With a neutral link.normally this are the switches which are used in case of three phase connections and as main switch......gonecase17@gmail.com