A cascade AD converter that has shorter settling time and enables high-speed operation is provided. The temperature of heating is above the glass transition temperature of the polyarylate resin. A first delay circuit delays the switching of an operation of the first bias circuit using a first delay time, and a second delay circuit delays the switching of an operation of the second bias circuit using a second delay time. The weight bar is movable by the carriage vertically and front to back. The Medium Voltage Circuit Breaker further has a supervisor device of the capacitor bank which measures the Equivalent Series Resistance andor the Capacitance of the capacitor bank system.