Strange 3legged component in switched mode PSU

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I am looking to upgrade a PSU in a peice of digital studio equipment.

It is switched mode, I think (I have no schematic).

On the outputs are strange 3 legged components that look like small dipped polyester caps (bright orange). The markings on the PCB indicate EM1,EM2...etc. What are they?
On the component itself are the numbers....

2239
K 05

I'm curious.....?
Thanks
Marius
 
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