Key Features of POE Injectors

• Power redundancy:
  • POE injectors with power redundancy have a terminal block port and also have a DC barrel 2.1mm port.
  • The terminal block connector can be connected to a UPS, allowing redundancy in the power source: You can connect to a backup power source. This redundancy feature adds very little to the cost. We carry DC barrel connectors with lead wire.
  • We also carry POE injectors that have a built-in battery backup power source, for uninterruptible power.
• Surge protection (High-power): To add this feature as a separate item would cost around $25, but this inexpensive POE injector has surge protection built-in.


• Passive POE adapter means that the input voltage can range from 5Vdc to 57Vdc
• 12v, 18v, 24 & 48-volt power supplies are compatible & fit our POE injectors' 2.1mm DC barrel jack..
• You can make longer cable runs with 24 or 48 volts.
• You may need a voltage-step-down adapter to make sure that the final voltage going to the AP or router is not too much: See indoor and outdoor voltage step-down adapters.
• Reset button: POE adapter/injectors with a reset button.


• All of the above POE adapters/injectors are so inexpensive that you can keep spares at little cost.


• Ubiquiti POE Adapter Kits have a three-prong AC power cable (no DC power input).
• Ubiquiti PoE Adapters can be utilized for protecting ESD attacks that are the leading cause of device failures. You can effectively protect against ESD attacks using a grounded Ubiquiti PoE Adapter, TOUGHCable, and TOUGHCable Connectors
• Ubiquiti includes a 24-volt POE with all the gear that they ship with a POE in the box.

Power Over Ethernet was first launched by Cisco in 2000. The standards are IEEE 802.3af and IEEE 802.3at. "Midspan" means the same as POE injector: The term "midspan" refers to the concept of putting a POE injector as close as possible to the device being powered, since some voltage is lost in the ethernet cable.

• POE injectors have a port for the standard DC Barrel Connector on the right: 5.5x2.1mm.
• All of our power supplies have a standard DC Barrel Connector: 5.5mmx2.1mm
• POE injectors are also called POE adapters.