Shorted a circuit, breaker didn't trip but no power anymore

[Dave3]

I have a weird situation here. I was working on a switch that turns power off and on to my jacuzzi. I didn't secure the switch to the box when I turned the breaker back on for testing and so when I flicked the switch it moved and one of the terminal screws on the side of the switch made contact with the electrical box. It arced and I lost power. When I went to the breaker panel the breaker wasn't tripped. I'm almost certain that breaker is a dedicated line to the jacuzzi. I can't find any GFCI outlet or anything inbetween the breaker panel and this switch.

I replaced the switch and tried throwing the breaker off and on, but I still have no power. Any ideas? My next step is to open the breaker panel and see if there's something wrong with the breaker.

 

[Irv]

Breakers can burn out. Either test it or replace with a known good one. But the real problem here is using a jacuzzi without a GFI breaker. How can that possibly be legal or safe? Perhaps it has one built-in somewhere?