Roxburgh DRF Series The DRF series from Roxburgh are a range of DIN Rail rail-mounted filters. Suitable for use in AC and DC applications up to line voltage and frequency, DRF power line filters also include voltage spike protection across the line. Features and Benefits: Spike and surge protection Universal fitting Suitable for both 'Top Hat' and 'G-Type' rails Effective filtering between 150 kHz to 30 MHz 30°C maximum temperature rise at full load Different current rating options from 1A to 10A are available