Measurement Circuit (Voltmeter & Ammeter)
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This page explains how Current Shunt / 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 used to measure electrical current by creating a proportional voltage drop (shunt) or by electromagnetic induction (CT) for safe monitoring in measurement circuits.
Technical details and manufacturing context for Current Shunt / CT
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Rated Primary Current | 5–5000 A | Select based on load current; higher values require larger core.IEC 60044-1 |
| Rated Secondary Current | 1–5 A | Standard output for meters and relays.IEC 60044-1 |
| Accuracy Class | 0.1–0.5 | Lower class for metering; higher for protection.IEC 60044-1 |
| Burden | 2.5–30 VA | Must match connected device impedance.IEC 60044-1 |
| Rated Voltage | 0.66–35 kV | Insulation level for system voltage.IEC 60044-1 |
| Frequency | 50–60 Hz | Matching system frequency is essential.IEC 60044-1 |
| Thermal Short-Circuit Current | 10–50 kA | Withstands fault current for 1s.IEC 60044-1 |
| Dynamic Short-Circuit Current | 25–125 kA | Peak withstand without damage.IEC 60044-1 |
| Insulation Class | E–H | Temperature rating of insulation materials.IEC 60085 |
| Operating Temperature | -40–85 °C | Extended range for outdoor use.IEC 60068-2-1 |
| Humidity Range | 0–95 % RH | Non-condensing conditions.IEC 60068-2-78 |
| Degree of Protection | IP54–IP65 | Dust and water resistance for enclosure.IEC 60529 |
| Weight | 0.5–50 kg | Depends on rated current and voltage. |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
| pressure: | Atmospheric to 1.5 bar (non-pressurized applications, varies by enclosure) |
| other spec: | Current range: 1A to 5000A (shunts), 5A to 5000A (CTs); Accuracy: ±0.1% to ±1% |
| temperature: | -40°C to +85°C (typical industrial range, varies by model) |
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.
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A current shunt is a low-resistance element that produces a voltage drop proportional to the current, used for DC and low-frequency AC measurements. A current transformer (CT) uses electromagnetic induction to produce a reduced, isolated current signal, suitable for high AC currents and providing galvanic isolation.
The rated primary current should match the maximum load current of the circuit, with a margin for safety. For example, if the load current is 100 A, a CT with a primary rating of 150 A or 200 A may be appropriate. Always consult the manufacturer's guidelines and verify the actual system requirements.
Accuracy class indicates the maximum permissible error of the CT or shunt at rated conditions. For metering, classes like 0.1, 0.2, or 0.5 are common; for protection, classes like 5P or 10P are used. Higher accuracy (lower number) is required for precise billing or measurement.
Burden is the load impedance (in VA) connected to the secondary winding of a CT. It must match the impedance of the connected devices (meters, relays) to ensure accurate performance. Exceeding the rated burden can cause errors or saturation.
This component is essential for the following industrial systems and equipment:
Commonly used trade names and technical identifiers for Current Shunt / CT.
Editorial classification, named public sources where available, and source-reviewed manufacturer records.
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