The invention relates to a biodegradable resin composition containing a biodegradable resin, a plasticizer and a crystal nucleus agent, the plasticizer being a compound containing two or more ester groups in the molecule thereof, wherein at least one alcohol component constituting the ester contains an alkylene oxide having 2 to 3 carbon atoms, added in the average amount of 0. The current imbalance detection and circuit interrupter includes a housing, power supplies, a sensor system for sensing a current imbalance at the line side of the electrical circuit, a logic controller and a power controller including a power relay having contacts capable of surviving carry-break and make-carry-break types of ground fault conditions at anticipated current levels. In high performance monde, the dual execution cores operate independently. A rotationally driven shaft rotates the rotor to displace the dispersion media so as to disperse the material to be treated. The entertainment device is mountable to an oscillating device that conveys the oscillatory motion from the oscillating device to the entertainment device.