Customer requested support on the design of a new electronic board (PCB) which included a high-power relay as main component. The circuit entitles a temperature sensor, a small low-power Atmel microcontroller, a power relay and all the necessary in-circuit- protections (over voltage, over current, etc.)  for a board that must be UL approved as an Industrial C0ntroller Module. The sensor was monitoring the temperature at the compressor of an Industrial Air-conditioning systems and prevented the system to defrost by interrupting the voltage of the system when temperature went under 32 °F.