The ZTG transfer switch is designed for residential and light commercial standby generator applications, incorporating a double-throw, mechanically interlocked contactor mechanism.Amps 600 Volts 120/208 Phase Three Additional Product Specs * 3-Pole * ZTG MX150 microprocessor panels * Undervoltage sensing * Time delay engine start * Engine warmup and cool down * LED indicator lights * Pushbutton testing and engine start