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.
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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.
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 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.
Astm a312
WP is used in front of the grades for pipe fittings after the production standard. Like ASTM A403 WP304L. TP is used in front of the grades for pipes (not fittings) after the production standard. Like ASTM A312 TP304L.