Over Current protection: when over current occurs, the power supply will automatically switch to self-protection status, when condition removed, then switch back to normal.
Power Supply boxes are a must have for CCTV camera installations with 4 or more cameras. These boxes connect to a regular 110V power outlet and inside have a terminal board that outputs 12V DC voltage for multiple cameras. They come in a few varieties depending on the number of cameras, and the amount of amperage (aka current) they can support: