Electrical Inverter - Pulse width modulated - T-Grid Mount Mini-electrical inverter systems for powering up to 55/110Watt of incandescent, fluorescent, induction or LEDlighting loads. Pulse width modulated (PWM) output design provides clean, 60Hz. sinusoidal emergency power to loads. T-Grid mounting fixtures. MPS models support Normally-ON, Normally-OFF or SWITCHED operation. Input Voltages: 120 or 277VAC field selectable. Input Frequencies: 60Hz ±2% Input Protection: Provided by Service Panel, Rated 20A max. Output Voltages: (60Hz) 120 or 277VAC Waveform: Sinusoidal (digitally controlled, PWM design) Output Frequencies: 60Hz. ±0.3Hz during emergency cycle Output Distortion: Less than 3% THD (linear load) Output Protection: Inverter fuse Heavy duty steel cabinet is finished in white baked-on powder paint providing scratch and corrosion resistance.