What it is and what it does
The ABB S201P-B10 is a molded case circuit breaker from the System pro M compact family, combining a delayed thermal tripping mechanism for overload protection with an electromechanical tripping mechanism for short-circuit protection. That dual-action means the breaker handles sustained overcurrents (heating the bimetal strip) and instantaneous fault currents (pulling the solenoid) in one DIN-rail-mountable package — standard for panelboard and distribution subfeeds where you need both curves in a single pole.