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Type: Miniature PCB-mount current transformer (CT) / micro-current transformer.
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Turns Ratio: 1000 : 1 — Primary 1 turn (the wire through the hole), Secondary ~1000 turns.
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Rated Primary Current: 5 A AC (50/60 Hz) → produces 5 mA output on secondary when 5 A flows through primary.
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Linear Range: 0 A up to ~10 A (with appropriate burden resistor) — many sellers and datasheets list usable range up to ~10 A.
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Output (Secondary): 5 mA (at 5 A primary). Many modules include a burden resistor to convert to a measurable voltage.
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Accuracy Class / Linearity: 0.2 class, linearity ≤ 0.2% over typical use range (~5% to 120 % of rated current).
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Phase Angle Error: ≤ 15′ (minutes) when input is 5 A and using a 50 Ω sampling resistor (i.e. phase error minimal, good for power measurement).
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Isolation (Dielectric Strength): Up to 4500 V (isolation between primary and secondary), providing galvanic isolation — important for safety when measuring mains AC.
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Encapsulation & Build: Epoxy-sealed, PCB-mountable with straight-through primary hole (wire under test passes through center).
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Operating Temperature Range: −40 °C to +85 °C (some listings up to +70 °C) depending on datasheet version.
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AC current measurement & energy monitoring: Useful for building power meters, load monitors, energy sensors for mains or AC loads.
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Galvanic isolation between mains and MCU: Because of high isolation voltage (4500 V), good for safely measuring mains current while keeping control circuitry (Arduino/ESP etc.) isolated.
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Works as a current transformer: Primary is simply the wire through the hole; secondary output is a current — you need to add a burden resistor across the secondary to convert that current into a measurable voltage (then feed to ADC or amplifier).
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Module compatibility: Commonly used with microcontrollers / ADC (Arduino, STM32, etc.). If using raw CT (without amplifier), ensure proper burden resistor and offset to avoid negative voltage swings.
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Range considerations: While rated 5 A, module may handle somewhat higher currents short-term, but accuracy and transformer saturation may degrade — best for ≤5 A continuous for accurate readout.
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