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      China sensor manufacturers

      China Temperature Sensor & Thermistor manufacturer

      SMD2920 PPTC AC resettable fuse

      Product Item: SMD2920 PPTC AC resettable fuse
      Category: SMD PTC
      Resettable fuse is an overcurrent electronic protection component. High molecular weight organic polymer is used under high pressure, high temperature, and vulcanization reaction conditions. After doping with conductive particle material, it is processed by special technology. Traditional fuse overcurrent protection, protection only once, blown in need of replacement, but resettable fuse with the flow overheating protection, automatic recovery dual function.

      • PRODUCT DETAIL
      Resettable fuse is an overcurrent electronic protection component. High molecular weight organic polymer is used under high pressure, high temperature, and vulcanization reaction conditions. After doping with conductive particle material, it is processed by special technology. Traditional fuse overcurrent protection, protection only once, blown in need of replacement, but resettable fuse with the flow overheating protection, automatic recovery dual function.

      working principle
      Resettable fuse, is specially treated by the polymeric resin (Polymer) and distribution, in the inside of the conductive particles (Carbon Black) composition.
      Under normal operation, the polymer resin tightly binds the conductive particles outside the crystalline structure to form a chain-shaped conductive electrical path. At this time, the resettable fuse is in a low-resistance state, and the thermal energy generated by the current flowing through the resettable fuse on the line is small, and the crystal structure will not be changed.

      When the circuit is short-circuited or overloaded, the large current flowing through the resettable fuse, the heat generated will melt the polymer resin, the volume will increase rapidly, and a high-resistance state will be formed (b), and the working current will decrease rapidly, thereby limiting and protecting the circuit .
      When the fault is removed, the self-recovery fuse re-cools and crystallizes, the volume shrinks, and the conductive particles form a conductive path again. The self-recovery fuse is restored to the low resistance state, thereby completing the protection of the circuit without manual replacement.


      Applications: All high-density circuit boards
      Features: Surface mount components, faster than ordinary SMD fuse action
      Operating current: 0.3A ~ 3A
      Operating temperature range: -40 ℃ to 85 ℃
      Lead-free, halogen-free environmentally friendly products, RoHS and REACH standards
      50ma self-recovery fuse

      Electrical characteristics of products (25℃)
      Model  Vmax Imax Ih It Pd Time to trip Resistance
      V A A A W Current(A) Time(s) Rmin(Ω) R1max(Ω)
      SMD2920P030TF 60.0 10 0.30 0.60 1.5 1.5 3.0 1.000 5.000
      SMD2920P050TF 60.0 20 0.50 1.00 1.5 2.5 4.0 0.350 1.300
      SMD2920P075TF 30.0 40 0.75 1.50 1.5 8.0 0.3 0.300 1.000
      SMD2920P100TF 30.0 40 1.00 2.00 1.5 8.0 0.5 0.100 0.400
      SMD2920P125TF 15.0 40 1.25 2.50 1.5 8.0 2.0 0.080 0.300
      SMD2920P150TF 15.0 40 1.50 3.00 1.5 8.0 2.0 0.050 0.230
      SMD2920P185TF 15.0 40 1.85 3.70 1.5 8.0 2.5 0.040 0.130
      SMD2920P200TF 15.0 40 2.00 4.00 1.5 8.0 4.5 0.030 0.100
      SMD2920P250TF 8.0 40 2.50 5.00 1.5 8.0 16.0 0.025 0.085
      SMD2920P260TF 8.0 40 2.60 5.20 1.5 8.0 20.0 0.025 0.075
      SMD2920P300TF 6.0 40 3.00 6.00 1.5 8.0 20.0 0.020 0.060


      Sign Definition
      Ih Hold current-maximum current at which the device will not trip at 25℃
      It Trip current-minimum current at which the device will always trip at 25℃
      Vmax Maximum voltage at which the device will not trip
      Vmaxi Maximum voltage device can withstand without damage at it rated current
      Imax Maximum fault current device can withstand without damage at rated voltage
      Rmin Minimum device resistance at 25℃ prior to tripping
      Rmax Maximum device resistance at 25℃ prior to tripping
      Figure The Figure of PTC
      Lead Lead diameter
       
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