Difference between "Single pole with switched neutral" AND "Double Pole" ?

[michael8554]

What's the difference please between:

"Single pole with switched neutral" means a circuit breaker or switch that switches both the live (hot) and neutral wires, ensuring complete isolation of the circuit when turned off, unlike a single-pole switch that only switches the live wire."

AND

"Double Pole means a double-pole switch or circuit breaker switches both the live and neutral wires, providing complete isolation of the circuit when turned off."

 

[binky]

One is a more compact version of the other. Double pole being older larger version.

 

[nicebutdim]

SP+N lacks overcurrent protection on the neutral.