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A Low-Cost Method for Trip Current Reliability Analysis of Polymer Positive Temperature Coefficient Resettable Fuses.

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Title: A Low-Cost Method for Trip Current Reliability Analysis of Polymer Positive Temperature Coefficient Resettable Fuses.
Authors: van Niekerk, Daniel1 (AUTHOR), Venter, Johan1 (AUTHOR) johanv@uj.ac.za
Source: Energies (19961073). Jun2026, Vol. 19 Issue 11, p2576. 17p.
Subject Terms: *Constant current sources, *Test methods, *Engineering reliability theory, *Overcurrent protection
Abstract: This study presents a low-cost, practical approach for determining the average trip current level from a statistically significant sample of polymer positive temperature coefficient (PPTC) fuses. The experimental method uses a controlled constant-current source (CCS) to test PPTC fuses over a range of standard room temperatures without an expensive temperature chamber. This novel approach enables designs to practically investigate the reliability of trip current levels for equivalent specified PPTC fuses from different manufacturers. The experimental setup uses a calibrated CCS circuit to incrementally increase current through a PPTC fuse by 0.01 A. The current flow duration for each applied CCS setting was set to the specified time-to-trip value before device trip determination. The trip condition is identified when the sensed PPTC current drops to 50% of the specified fault trip current. To prevent thermal runaway, an empirically determined zero-current cool-down period separates each current increment. Testing revealed differences in the average trip currents of PPTC fuse samples from different manufacturers: 1.26 A, 1.10 A, and 1.06 A, respectively. The determined 95% confidence interval trip-current ranges also revealed a significant difference between PPTC manufacturer populations. The findings reveal that PPTC determined average trip current within the standard room-temperature range can serve as an effective comparison metric between manufacturers with equivalent device specifications. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 194587964
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: A Low-Cost Method for Trip Current Reliability Analysis of Polymer Positive Temperature Coefficient Resettable Fuses.
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  Group: Au
  Data: <searchLink fieldCode="AR" term="%22van+Niekerk%2C+Daniel%22">van Niekerk, Daniel</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Venter%2C+Johan%22">Venter, Johan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> johanv@uj.ac.za</i>
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  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Jun2026, Vol. 19 Issue 11, p2576. 17p.
– Name: Subject
  Label: Subject Terms
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  Data: *<searchLink fieldCode="DE" term="%22Constant+current+sources%22">Constant current sources</searchLink><br />*<searchLink fieldCode="DE" term="%22Test+methods%22">Test methods</searchLink><br />*<searchLink fieldCode="DE" term="%22Engineering+reliability+theory%22">Engineering reliability theory</searchLink><br />*<searchLink fieldCode="DE" term="%22Overcurrent+protection%22">Overcurrent protection</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study presents a low-cost, practical approach for determining the average trip current level from a statistically significant sample of polymer positive temperature coefficient (PPTC) fuses. The experimental method uses a controlled constant-current source (CCS) to test PPTC fuses over a range of standard room temperatures without an expensive temperature chamber. This novel approach enables designs to practically investigate the reliability of trip current levels for equivalent specified PPTC fuses from different manufacturers. The experimental setup uses a calibrated CCS circuit to incrementally increase current through a PPTC fuse by 0.01 A. The current flow duration for each applied CCS setting was set to the specified time-to-trip value before device trip determination. The trip condition is identified when the sensed PPTC current drops to 50% of the specified fault trip current. To prevent thermal runaway, an empirically determined zero-current cool-down period separates each current increment. Testing revealed differences in the average trip currents of PPTC fuse samples from different manufacturers: 1.26 A, 1.10 A, and 1.06 A, respectively. The determined 95% confidence interval trip-current ranges also revealed a significant difference between PPTC manufacturer populations. The findings reveal that PPTC determined average trip current within the standard room-temperature range can serve as an effective comparison metric between manufacturers with equivalent device specifications. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.3390/en19112576
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 17
        StartPage: 2576
    Subjects:
      – SubjectFull: Constant current sources
        Type: general
      – SubjectFull: Test methods
        Type: general
      – SubjectFull: Engineering reliability theory
        Type: general
      – SubjectFull: Overcurrent protection
        Type: general
    Titles:
      – TitleFull: A Low-Cost Method for Trip Current Reliability Analysis of Polymer Positive Temperature Coefficient Resettable Fuses.
        Type: main
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          Name:
            NameFull: van Niekerk, Daniel
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            NameFull: Venter, Johan
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
          Identifiers:
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              Value: 19961073
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              Value: 19
            – Type: issue
              Value: 11
          Titles:
            – TitleFull: Energies (19961073)
              Type: main
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