The RK5PWR-120 power supply can be used to replace a failed power supply in the RK5000PS-3U. You can easily replace the internal power supply in the RK5000PS-3U in case of failure. The front of the power supply has two LEDs and a Pelco badge. The top LED turns red when there is an alarm condition from one of the modules. The bottom LED turns red and the blue Pelco badge stops illuminating when the power supply fails.