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This page explains how Current Transformer (CT) is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.
A device that transforms high primary current into a lower, measurable secondary current for metering and protection purposes.
Technical details and manufacturing context for Current Transformer (CT)
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Rated Primary Current | 5–5000 A | Select based on maximum load currentIEC 61869-2 |
| Rated Secondary Current | 1–5 A | 5 A for standard metering, 1 A for long cable runsIEC 61869-2 |
| Accuracy Class | 0.2–5P | 0.2 for metering, 5P for protectionIEC 61869-2 |
| Rated Burden | 2.5–30 VA | Must match connected device burdenIEC 61869-2 |
| Rated Frequency | 50–60 Hz | Standard power grid frequenciesIEC 61869-2 |
| Rated Short-Time Thermal Current | 10–50 kA | Withstands fault current for 1 sIEC 61869-2 |
| Rated Dynamic Current | 25–125 kA | Peak withstand capabilityIEC 61869-2 |
| Insulation Level | 0.72–36 kV | Rated insulation voltageIEC 61869-2 |
| Operating Temperature Range | -40–85 °C | Extended range for outdoor useIEC 61869-2 |
| Degree of Protection | IP54–IP65 | IP65 for outdoor, IP54 for indoorIEC 60529 |
| Rated Continuous Thermal Current | 120–150 % | Percentage of rated primary currentIEC 61869-2 |
| Weight | 1–50 kg | Depends on voltage class and ratio |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
Commonly used trade names and technical identifiers for Current Transformer (CT).
This component is essential for the following industrial systems and equipment:
| pressure: | Atmospheric to 1.5 bar (typical enclosure rating) |
| other spec: | Primary current range: 1A to 5000A, Frequency: 50/60 Hz ±10%, Accuracy class: 0.1 to 3.0 |
| temperature: | -40°C to +85°C (operating), up to +120°C (short-term) |
Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.
Quoted from the published standard.
12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.
Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.
A practical evidence checklist for RFQ preparation and supplier evaluation.
CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.
Accuracy class 0.2 is used for metering applications, providing high accuracy with a limit of error of 0.2% at rated current. Class 5P is for protection, allowing a composite error of 5% under specified fault conditions, ensuring reliable operation of protective relays.
Standard secondary currents of 1A and 5A are chosen to match common metering and protection devices. 5A is standard for short cable runs, while 1A is used for long cable runs to reduce power losses and burden on the CT.
If the secondary circuit is opened while the primary is energized, the CT can produce a very high voltage across the open terminals, posing a safety hazard and potentially damaging the insulation. Always short-circuit the secondary before disconnecting devices.
Select a CT based on the maximum load current, required accuracy class, system voltage, burden of connected devices, and environmental conditions. Verify that the CT's rated primary current is greater than the expected load, and that the burden does not exceed the CT's rated burden. Always consult the manufacturer's datasheet.
Editorial classification, named public sources where available, and source-reviewed manufacturer records.
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