Looking for a four prong (pole/terminal) Dyson on/off switch?
Dyson do not sell them any more.
In fact almost nobody sells them any more. They were from early models of Dyson vacuum cleaners and were superseded by the two prong switch.
If you fit a two prong switch to a machine wired for four prong, you have to alter the wiring somewhat.
Why have that hassle? Why not just buy an original Dyson 4 pole switch from Manchester’s leading Dyson parts specialists?