That would be charging up the spring to throw the breaker. High voltage breakers need to switch on (or off) very quickly, to avoid damage from arcing. It's common for them to have some kind of spring or gas piston arrangement that you pump up first to give them enough energy to do that quickly.

Nice attention to detail by the filmmakers.

No, he's winding up a spring to close the circuit breaker quicker than a human hand could, which reduces/prevents and arc from forming as the electrical contacts close.

Hold on to your culos.

Ah shit now I want that panel for my dream house

I found a Siemens WLL2F325 on eBay for only $24k

https://www.ebay.com/itm/115854984950

How did you remember this scene?!

When you watched Jurassic Park in a theater in your formative years, it tended to leave an impression.

https://m.youtube.com/watch?v=WgQe68kF_8M

If you were the right age when it came out in theaters in '93 (roughly between 11-15), Jurassic Park was a huge deal. Titanic was another of those in that era (although mainly to certain females).

Yep, I can still remember the immediate after-effect seeing it for the first time in theaters when I was 7.