• 1.

    Operating Temp. Range: The combination of ambient temperature and temperature rise.

  • 2.

    Current Rating: The primary current rating is for reference only and is limited by the current capacity of the customer-supplied primary conductor.

  • 3.

    Self-Resonant Frequency: The value is for reference only.

  • 4.

    Flammability Standard: Meets UL 94V-0.

  • 5.

    Material Rating: Meets requirements for UL Class A temperature rating. Ambient + Temp. Rise + Hotspot Allowance < 105 ºC

  • 6.

    Terminating Resistor (RB): To calculate the value use the formula,
    RB = EOTR/IP

  • 7.

    ET Product: Rated at 100ºC. Suitable for bipolar applications only.
    ET = EO/2f
    EO = IPRB/TR

    Whereas,
    EO = Output voltage (V)   TR = Turns Ratio
    RB = Term. Resistor (Ω)       f = Frequency (Hz)
    IP = Primary Current (A)

  • 8.

    PACKAGING

    • Pieces/Tray: 100

    • Trays/Box: 10

    • Pieces/Box: 1000

  • 9.

    Compliance & Solutions:

    RoHS Compliant    Custom Solutions

  • 10.

    Specifications subject to change without prior notice.

Frequently Asked Questions (FAQs)

What current levels can CT08 handle reliably?

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CT08 is rated up to 50 A RMS (primary current) under reference conditions. The actual current limit depends on the conductor used as the primary — CT08 itself will not limit the conductor’s ampacity.

What frequency range does CT08 support, and what does this mean for application?

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CT08 supports frequencies from ~30 Hz up to ~4.7 kHz in standard configurations, making it suitable for mains AC, low-frequency switching supplies, motor control, inverters, or pulse-based loads — but not ideal for high-frequency SMPS or high-rate gate-drive measurement.

How is the output signal configured for CT08?

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CT08 uses a 1:1200 turns ratio: the secondary winding’s output is scaled down relative to the primary current by a factor of 1200. Designers must apply an appropriate burden resistor at the secondary to convert the scaled current into a measurable voltage, staying within the transformer’s volt-microsecond (V·µs) limits to avoid core saturation.

Can CT08 sense DC current?

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No — as a conventional current-sense transformer, CT08 requires an alternating or pulsed current (AC or varying DC). It cannot reliably sense steady DC current because there would be no change in magnetic flux to induce secondary current.

What insulation and safety rating does CT08 provide?

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CT08 is a through-hole transformer with a 3750 VAC primary-to-secondary isolation (Hi-Pot) rating and meets flammability/temperature standards appropriate for industrial power applications.

What limitations should a designer be aware of when using CT08?

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Because CT08’s self-resonant frequency (SRF) is relatively modest, and its bandwidth is limited to a few kHz, it may not accurately track very high-frequency or high-dv/dt signals. In addition, the primary conductor must be specified carefully — including current rating, thermal capacity, and mechanical integrity — since CT08 does not provide protection for the conductor itself.

How should the burden resistor (termination) be selected for CT08?

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Calculate the burden resistor based on the expected primary current, the 1:1200 turns ratio, and desired output voltage — ensuring the resulting volt-microsecond product stays within the rated limit. Over-sizing the burden resistor or exceeding rated current/frequency can cause core saturation and measurement distortion.

Is CT08 a good substitute for a shunt resistor in high-current systems?

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Yes — CT08 offers several advantages over shunts: minimal insertion loss (no series resistance), galvanic isolation between primary and measurement circuits, and lower heating under heavy current. However, unlike shunts, CT08 cannot measure steady DC and requires a suitable burden resistor and secondary circuit design.

What types of applications best suit CT08?

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CT08 is ideal for high-current, low- to mid-frequency systems such as motor controllers, industrial AC load monitoring, inverters, UPS and battery systems, AC mains metering, and switching supplies where current pulses or AC are expected.

What are the mechanical and layout considerations when using CT08?

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Because CT08 is a through-hole transformer, ensure the PCB layout supports its pin spacing and footprint. The primary conductor must be routed centrally through the core opening, with adequate copper width to carry the rated current without excessive heating. Also design for clearance and creepage distances if galvanic isolation and safety standards apply.