The 7277 series circuit breaker by Klixon is designed for jobs that do not require as tight of performance, characteristics, and approvals of the Klixon military style circuit breakers. QUALIFICATIONS: The 7277 is a single phase, non-compensated, low amp, GENERAL application. The circuit breaker is miniature in size, lightweight, with a trip free design. The current ratings are 1/2 to 20 amps. High vibration resistance, as well.