Abstract: A circuit for controlling the power to a load such as motor or incandescent lamp with reduced radio frequency interference employs a microcontroller to trigger a power transistor into a conductive state for supplying power to the load. The power transistor is switched on and off at a controlled slew rate through an integrator circuit coupled between the microcontroller and the power transistor. A zero current detector circuit detects when no current is passing through the load during each half cycle of the live voltage to switch the power transistor off by generating an interrupt request signal which is supplied to the microcontroller. After an operator selected time interval, the microcontroller generates a signal to switch the transistor to a conductive state.