The SD40 M series mobile frequency converters from Power Systems International Ltd are designed to replace the traditional, noisy, air-polluting diesel engine-driven 400Hz GPUs with the latest design in solid state frequency converters. The SD Series produces a high stability 400Hz output and can simply be plugged into the normal 50Hz or 60Hz mains power source. The product will accept a wide variation in input voltage and frequency and utilize the latest in IGBT power conversion PWM inverter switching technology.