Summary of concept of self restoring fuse

Self restoring fuse working principle:
Self restoring fuse is a positive temperature coefficient polymer thermistor. The normal value is very small, when the circuit over-current makes its temperature increases, the resistance increases several orders of magnitude, so that the current in the circuit is reduced below the safety value, the effect and the switch component is similar, only the slow response speed.

Self recovery fuse structure:
Composed of polymer and conductive carbon particles Self restoring fuse overcurrent protection:
The PPTC component is connected in series in the circuit, under normal circumstances, a low resistance state, to ensure the normal work of the circuit; when the circuit is short circuited or into abnormal current, PPTC components from the thermal impedance increases to limit the current small enough, the function of over-current protection.

Self recovery fuse characteristic parameters:
The main characteristic parameters of self recovery fuses are the following:
Keep current IH: will not make the maximum value of resistance mutation.
Trigger current IT: can make the resistance value suddenly increase the minimum current.
Action time Ttrip: through 5IH (LP Series) or 3IH (LBR Series) or specified current (other series of maximum operating time). The higher the current or / or the higher the temperature, the shorter the operating time.
The maximum voltage: Vmax can withstand the maximum voltage at rated current, sometimes with a maximum voltage of Vmax interrupt can withstand the impact.
The maximum current: Imax maximum fault current can withstand under rated voltage.
The action of power Pdtyp power consumption under the condition of action.
The static resistance: the resistance value should be R with no power in the case of static resistance minimum Rmin and maximum range determined by Rmax, Rmin = R = Rmax.

Self recovery fuse selection two main points:
1 working voltage of Equipment > Max voltage of self recovery fuse
2 operating current of the device > maintenance current of recovery fuse
The main applications of semiconductor discharge tube:
Telecommunications and network
User terminal equipment
Analog / analog circuit card
T1/E1 equipment
ISDN equipment
ASDL equipment
HDSL equipment
General distribution frame security unit
Wired telephone / cable to the user center
Two, other industries
Security (visual intercom),
Monitor、
High frequency switching power supply and other industries

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