The Zinsco QC-30 is a 30-amp, 240-volt plug-in circuit breaker. It is designed for use in original Zinsco panels and is not compatible with other brands. The QC-30 is rated for a maximum of 10,000 amps at 240 volts. It has an instantaneous trip time of less than 1 second, and a total clearance of 3 inches. The Zinsco QC-30 is UL listed and CSA certified.