What is a 'piano THT' footprint for?

That's a DIP switch array, just that the switches don't move left or right, but up or down. The component visually resembles a (musical) keyboard, hence the name.

If you have a current version of kicad, try the 3D viewer (there's a button for that in your window). You'll see the component in 3D!

Left: horizontal switch; right: vertical switch


These are just different styles of DIP switches. The piano style has switch levers that hang over the side and actuate up and down like piano keys. These are useful when the board will be mounted in such a way that only the edge of the board is accessible, for instance when inserted into in a card cage.

For example: https://www.digikey.com/product-detail/en/cts-electrocomponents/194-4MST/CT1944MST-ND/42440

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Surface Mount

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Through Hole

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