This FAQ entry describes the DSP-W215 Smart Plug maximum current load specifications
Specifications
Underwriters Laboratory (UL) certifies the DSP-W215 Smart Plug for 12.5 Amps. Applying Ohms law and the United States 120 volts power lines, this equates to: 12.5 Amp x 120 Volts = 1,500 Watts maximum power.
The integrated temperature sensor will power-off if the internal temperature surpasses 65 degrees celcius (149 degrees Fahrenheit).