Fuse blown self-healing circuit diagram principle

The circuit operation principle of the device is shown in the following figure. When the fuse FU1 is intact, the bubble ND is short-circuited and not lit, and the LSE pin 1 and pin 2 are connected. At this time, the LSE pin 4 outputs a high level, the triode VT is turned off, and the one-way thyristor VS has no trigger current does not work. Relay J has no current and does not pull in. Once FU1 is blown, the circuit of the 1st and 2nd legs corresponding to the LSE is disconnected, so the 4th pin of the LSE outputs a low level, the transistor VT is turned on, and the voltage generated on the resistor R3 drops to make the VS turn on and self-lock, relay J Excitation pull-in, the second fuse FU2 is turned on, and the load RL continues to work. If the second fuse FU2 is blown again, the bubble ND is lit at this time, indicating that there is a fault in the circuit, and the power should be applied after the repair, so as to avoid causing a larger fault.

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Fuse blown self-healing circuit

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1 JST wire harness
  FH-----0.5mm               ZH-----1.5mm
  SH-----1.0mm               PH-----2.0mm
  GH-----1.25mm              VH-----3.96mm
  EH/XH-----2.5/2.54mm
2 Molex wire harness
  PicoBlade-----1.25mm      PicoClasp-----1.0mm
  PiciLock------1.0/1.5mm   Minifit Jr-----4.2mm
  MicoBlade-----2.0mm       MicoClasp-----2.0mm
  MicoLock-----1.25/2.0mm
3 IDC flat ribbon cable
  Contact material----Copper alloy
  Test voltage------500V AC
  Current rating-----1A
  Cable Technical Data:
  Contact Material----Tin plated copper
  Isolationswiderstand-->1000MΩ
  Insulation Resistance-->1000MΩ
  Temperature range----- -40℃.....105℃
  UL Typ---------UL2651,28AWG

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