RACK UPS. The Defender Rackmount expands the successful Defender Range by building the popular features into a Rack Mount NAS UPS perfect for shallow, wall mounted Comms cabinets. This versatile UPS uses Automatic Voltage Regulation (AVR) to minimise the effects of fluctuations in input voltage, protecting your valuable equipment from power line disturbances whilst also incorporating the best surge protection in its class. PowerShield Defender Rack Mount 1500VA UPS Line Interactive with AVR Battery 2 x 12V 9AH Long Life (8-10 Yr design Life) – reduced battery replacement maintenance costs Weights & Dimensions 438W x 300D x 86H mm – 13.8kg 2 Year Warranty