They have two common (-) and two (+) for connecting 2 power sources, such as a primary with a backup power source. They have various protections for surge, short circuit and overload. The input and output are isolated.

Features
• Input Voltage 24VDC (18-36VDC)
• 8 wire 56VDC Passive PoE Output
• High Power Output to 70W
• Dual DC Inputs for Connecting 2 Power Sources
• Gigabit Data Thruput
• Low self consumption power (<2W)
• Short Circuit, Over Current and Reverse/Over Voltage Protection
• Industrial Temperature Range
• I.T.E. Power Supply, UL Listed

Applications
• 24VDC Remote Power Systems
• Ubiquiti airFiber Antennas
• High PoE Compatible Security Cameras

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