The SDU AC-B UPS internals are engineered to offer reliability in extreme environments, and to reduce the total cost of ownership with replaceable parts. A high heat battery lends to a wide operating temperature range (a storage temperature range of -40°C to +70°C, and an operating temperature range of 0° to +50°C), equating to an extended design lifetime and providing increased protection in high heat environments. Certified for Class 1 Zone 2, this UPS carries a T4 rating of 3,000 meters. In the event of a battery failure, a pass-through power feature continues to support the UPS, providing warning with an alarm. A replaceable battery is easily swapped out, leaving maintenance time reduced to mere seconds.