Watlow BPAC is designed to deliver stable, adjustable power to electrical loads without generating radio frequency interference. It offers precise control from 0 to full line voltage by allowing bursts of complete cycles of power supply into the load. Typical applications include duct heater control, constant resistance heaters like ovens, and furnaces. The BPAC is solid-state and uses zero-crossover firing of solid-state SCRs to supply power to loads without RFI.