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acb means AIR CIRCUIT BREAKER ,& vcb means VACUUM CIRCUIT BREAKER
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.
Actually ACB isused for Low Tension side and VCB is used for High Tension Side..Chappa matter
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.
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.