What are the red reset buttons on the back of my UPS for?

Name: Cyber Power Systems (USA), Inc.
Address: 4241 12th Ave E STE 400, Shakopee, MN, 55379, US
Telephone: +18772976937

FAQ Category: UPS

Those are circuit breakers. If one of the circuits were to be tripped, that button would be sticking out significantly farther than normal and would need to be pushed back in to reset the circuit.