Most Economical Push-to-Reset Circuit Breaker. UL1077. The MP Series 12 is designed for various applications in Household Appliances, Power Strips, Audio Visual Equipment, Marine Panels, Transportation, and more. They are available in various threaded and snap-in bushings, along with multiple Quick Connect terminal variations. Economically priced, these Series 12 thermal circuit breakers are the choice where space and price are vital to the application.