HM8143: Constant current operation (CC) (ID #526)
As soon as the output current reaches the programmed current limit value, the power supply automatically switches into its current source mode, if the electronic fuse is not activated. This mode is indicated by the CC LEDs (now Iactual = Ilimit and Vactual = Vset); the CV LEDs extinguish. The measured output voltage generally drops below the programmed voltage. The actual measured value can be read off the display. This mode is only possible if the electronic fuse is not active (FUSE LED is off).
You can find a detailed description about the electronic fuse in the manual of the HM8143 on page 26.