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    An AI Overview is not available for this searchCan't generate an AI overview right now. Try again later.
    AI Overview
    Wire lead zero phase current transformers (ZCTs) are compact, toroidal sensors used to detect ground faults (leakage current) by monitoring the vector sum of three-phase currents, producing a signal when leakage occurs. They are often used in earth leakage breakers and GFCI devices due to high sensitivity and PCB-mountable leads. 
    Key Features & Applications 
    • Leakage Detection: Ideal for detecting leakage current in appliances and electrical equipment.
    • Design: Toroidal core with wire leads for direct PCB mounting.
    • High Sensitivity: Capable of detecting small residual currents at the mA level.
    • Application Examples: Ground fault circuit interrupters (GFCIs), electric shock prevention, and short-circuit relays.
    • Compliance: Often RoHS and REACH compliant. 
    Common Models and Types 
    • ZCT Series: KEMET ZCT types are common for earth leakage breakers.
    • Lead Wire Type: Products like the ZCT201, ZCT204, or DL-CT20CL are typically used for easy, compact installation.
    • Parameters: Usually high ratio sensors tailored for small-current sensitivity. 
    Installation Tips 
    • Install as early as possible before cable termination heads.
    • Ensure the ZCT is fixed firmly to the switchgear.
    • Ensure that the ZCT core and secondary winding are reliably grounded. 
    For specific applications such as industrial power systems, these are often designed for high accuracy and to maintain balance in PCB assemblies. See Taehwatrans for more details on ZCTs. 
    • Zero Phase Current Transformer ZCT526 Manufacturer | Ctzentar.com
      Zero phase current transformer which detects the difference between the currents flowing in a number of conductors. The current fl...
      www.ctzentar.com
    • ZCT204 Lead Wire Type Zero Phase Current Transformer
      ZCT204 Lead Wire Type Zero Phase Current Transformer - Xiamen ZTC Technology Co.,Ltd.
      Xiamen ZTC Technology Co.,Ltd
    • Wire Lead Zero Phase Current Transformer
      wire-lead-zero-phase-current-transformer * Wire Lead Zero Phase Current Transformer Assembly ZCT201. High sensitivity and close to...
      www.ctzentar.com
    • Lead wire Zero phase current transformer ZCT ... - Carel Tech
      Sep 14, 2021 — The basic principle of zero-sequence current protection is based on Kirchhoff's current law: the algebraic sum of the complex curr...
      Tianjin Carel Tech
    • JJCEQBPE Wire Type Zero Phase Current Transformer 1A/0.5mA ...
      Buy JJCEQBPE Wire Type Zero Phase Current Transformer 1A/0.5mA 1A/1mA Single Phase toroidal Residual Current Transformer AC(DL-CT2...
      Amazon.com
    • Zero Phase CT - Differential / Ground Fault Current Transformer
      Features. - Minimum output voltage tolerance. - Close to zero load shift. - Minimum noise output at 360 degree hair-pin test. - Ex...
      Taehwatrans
    Show all
    • Zero Phase Current Transformer ZCT526 Manufacturer | Ctzentar.com
      Zero phase current transformer which detects the difference between the currents flowing in a number of conductors. The current fl...
      www.ctzentar.com
    • ZCT204 Lead Wire Type Zero Phase Current Transformer
      ZCT204 Lead Wire Type Zero Phase Current Transformer - Xiamen ZTC Technology Co.,Ltd.
      Xiamen ZTC Technology Co.,Ltd
    • Wire Lead Zero Phase Current Transformer
      wire-lead-zero-phase-current-transformer * Wire Lead Zero Phase Current Transformer Assembly ZCT201. High sensitivity and close to...
      www.ctzentar.com
    • Lead wire Zero phase current transformer ZCT ... - Carel Tech
      Sep 14, 2021 — The basic principle of zero-sequence current protection is based on Kirchhoff's current law: the algebraic sum of the complex curr...
      Tianjin Carel Tech
    • JJCEQBPE Wire Type Zero Phase Current Transformer 1A/0.5mA ...
      Buy JJCEQBPE Wire Type Zero Phase Current Transformer 1A/0.5mA 1A/1mA Single Phase toroidal Residual Current Transformer AC(DL-CT2...
      Amazon.com
    • Zero Phase CT - Differential / Ground Fault Current Transformer
      Features. - Minimum output voltage tolerance. - Close to zero load shift. - Minimum noise output at 360 degree hair-pin test. - Ex...
      Taehwatrans
    • Overview of zero phase current transformers
      Jul 26, 2022 — It's used to detect zero phase current. The ZPT has the following characteristics: * **Sensitivity** The current that makes the re...
      Xiamen ZTC Technology Co.,Ltd
    • ZCT Zero-Phase Current Transformers - KEMET | Mouser
      Dec 12, 2025 — KEMET ZCT Zero-Phase Current Transformers are compact molded-type, zero-phase current transformers. These modules are designed to ...
      Mouser Electronics
    • Detect Ground Faults with Zero Sequence Current Transformers
      A zero sequence current transformer, also known as a core balance current transformer (CBCT), detects zero sequence currents durin...
      FLEX-CORE
    • Zero Sequence Current Transformer - Voltage Disturbance
      Jun 30, 2022 — ZSCT is an excellent choice to detect GF when applied in resistively grounded systems. However, when applied in grounded source sy...
      Voltage Disturbance
    • Issues and Solutions for Installation of Zero-Sequence Current Transformers - Acrel Co., Ltd.
      Here are some tips for installing zero-sequence CTs: * Insert zero-sequence CTs as early as possible before making cable terminati...
      www.acrelenergy.com
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    Lead wire Zero phase current transformer ZCT ...


    Tianjin Carel Tech
    https://carel-tech.com › lead-wire-zero-phase-sequence-ct...
    Tianjin Carel Tech
    https://carel-tech.com › lead-wire-zero-phase-sequence-ct...
    Sep 14, 2021 — ROHS compliant Very competitive price Lead wire Zero phase current transformer ZCT coil for Meters, Ammeters, Energy meters etc.

    Wire lead Zero phase current transformer ZCT209


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    ctzentar.com
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    Wire lead type zero phase current transformers are easy integrated into standard PCB sub-assemblies that are compliant with IEC61008, IEC61009 and IEC62423 ...Read more

    Zero Phase CT - Differential / Ground Fault Current ...


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    https://www.taehwatrans.com › Zero-Phase_CT › Zero-...
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    The zero phase CTs are differential sensors passing both line & grounded neutral conductors into the CT aperture so as to make a zero phase sequence.Read more

    Detect Ground Faults with Zero Sequence CTs


    FLEX-CORE
    https://www.flex-core.com › application-whitepapers
    FLEX-CORE
    https://www.flex-core.com › application-whitepapers
    Learn to detect ground faults with zero-sequence current transformers. Explore our whitepaper for insights into electrical safety solutions.

    KEMET ZCT Zero-Phase Current Transformers


    Mouser Electronics
    https://www.mouser.com › new › kemet-electronics › k...
    Mouser Electronics
    https://www.mouser.com › new › kemet-electronics › k...
    KEMET ZCT Zero-Phase Current Transformers are zero-phase current transformers designed to improve the sensitivity, and weight of electric shock.
    $4.99 delivery · 30-day returns
    Missing: lead ‎| Show results with: lead

    Overview of zero phase current transformers


    Xiamen ZTC Technology Co.,Ltd
    https://cnzentar.com › Technical Guides
    Xiamen ZTC Technology Co.,Ltd
    https://cnzentar.com › Technical Guides
    The zero phase current transformer is a line fault current monitor. Generally, there is only one iron core and secondary winding.Read more
    Missing: lead ‎| Show results with: lead

    A Comprehensive Guide to Zero-Sequence Current ...


    weishoelec.com
    https://www.weishoelec.com › Blog
    weishoelec.com
    https://www.weishoelec.com › Blog
    Sep 21, 2025 — A zero-sequence current transformer is a specialized type of transformer designed to detect ground faults by monitoring the imbalance of current ...Read more

    Lead Wire type Zero Phase Current Transformers


    Zntar
    https://www.zntar.com › 266-lead-wire-type-zero-phase...
    Zntar
    https://www.zntar.com › 266-lead-wire-type-zero-phase...
    Supply all kinds of Lead Wire type Zero Phase Current Transformers. Welcome to order. sales@zntar.com, zntarjason@gmail.com.
    Discussions and forums
    Zero Sequence CT
    Mike Holt's Forum · 
    11 years ago
    Zero Sequence CT
    Mike Holt's Forum · 
    11 years ago
    The fourth CT is the ZSCT (zero sequence CT) which is placed around all three phases; should this ZSCT be also sized as 100A:5A, or should it be&n...  More
    Zero Sequence CT
    Mike Holt's Forum · 
    7 years ago
    Zero Sequence CT
    Mike Holt's Forum · 
    7 years ago
    Depending on the environment, it might be worth wrapping a CT around the conductors that you plan to do this zero sequence measurement and see ...  More
    Current Transformer Basics: Understanding Ratio, Polarity, and Class
    TestGuy Electrical Testing Network · 
    12 years ago
    Current Transformer Basics: Understanding Ratio, Polarity, and Class
    TestGuy Electrical Testing Network · 
    12 years ago
    Zero Sequence CTs are a type of window CT that is typically used for ground fault sensing on a circuit by summing the current on all conductors ...  More
    See more
    People also ask
    What is a zero phase current transformer?
    The zero phase current transformer is a line fault current monitor. Generally, there is only one iron core and secondary winding.

    Overview of zero phase current transformers


    Xiamen ZTC Technology Co.,Ltd
    https://cnzentar.com › Technical Guides
    Xiamen ZTC Technology Co.,Ltd
    https://cnzentar.com › Technical Guides
    What is the 80% rule for transformers?
    The 80% rule is a guideline that recommends operating a transformer at no more than 80% of its rated capacity under normal conditions. For example, if a power pole transformer is rated for 50 kVA, it should ideally carry no more than 40 kVA during continuous operation.Jan 5, 2026

    What Is the 80% Rule for Transformers? - ABG Bag


    ABG Bag
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    ABG Bag
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    What is the difference between CT and ZCT?
    Difference Between CT and ZCT

    CTs are designed to measure current in one conductor for metering or protection purposes. ZCTs, on the other hand, monitor multiple conductors simultaneously to detect leakage or ground faults. This difference makes them complementary devices in any complete protection scheme.    Sep 21, 2025

    A Comprehensive Guide to Zero-Sequence Current ...


    weishoelec.com
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    weishoelec.com
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    Does a CT need to be grounded?
    If the CT is not properly grounded, it can be affected by stray electrical fields and other interference, which can lead to inaccurate readings. Compliance: Grounding the CT is often required by electrical codes and standards.Mar 18, 2023

    Why current transformer shall be grounded - Heyi Electric


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    Heyi Electric
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