Current Shunt and CT Components | Industrial Measurement

Product Specifications

Technical details and manufacturing context for Current Shunt / CT

Definition

Current shunts and current transformers (CTs) are essential components in measurement circuits for voltmeters and ammeters. Shunts create a known, small voltage drop proportional to the current flowing through them, allowing current measurement via voltage sensing. CTs use electromagnetic induction to produce a reduced, isolated current signal proportional to the primary current, enabling safe measurement of high currents without direct electrical connection to the main circuit. Both serve to interface high-current power systems with sensitive measurement instruments.

In industrial electrical equipment manufacturing, these components are selected based on system parameters such as rated primary current, rated secondary current, accuracy class, burden, rated voltage, frequency, thermal and dynamic short-circuit currents, insulation class, operating temperature, humidity, and degree of protection. For example, rated primary current ranges from 5 A to 5000 A, with secondary outputs typically 1 A or 5 A. Accuracy classes from 0.1 to 0.5 are common for metering, while protection applications may require different classes. Burden values range from 2.5 VA to 30 VA, and rated voltage from 0.66 kV to 35 kV. Frequency must match the system (50 or 60 Hz). Thermal short-circuit current withstand is 10–50 kA for 1 second, and dynamic withstand is 25–125 kA. Insulation classes per IEC 60085 range from E to H. Operating temperature spans -40°C to 85°C, humidity up to 95% RH (non-condensing), and enclosure protection IP54 to IP65. Weight varies from 0.5 kg to 50 kg depending on ratings.

Materials commonly used include manganin alloy for shunts, silicon steel laminations for CT cores, copper windings, and insulating materials such as epoxy or PVC. These components are designed and tested according to IEC 60044-1 for current transformers, with additional standards for environmental conditions (IEC 60068-2-1, IEC 60068-2-78) and enclosure protection (IEC 60529).

When selecting a current shunt or CT, verify model-specific values and standards with the legal manufacturer or supplier, as the ranges provided are for reference only. Confirm that the component meets the required accuracy, burden, insulation, and environmental conditions for your specific application.

Working Principle

Current shunts operate on Ohm's Law (V=IR), where a precise, low-resistance element generates a measurable voltage drop proportional to the current. Current transformers operate on electromagnetic induction: alternating current in the primary winding creates a changing magnetic field, which induces a proportional current in the secondary winding, typically stepped down to a standard level (e.g., 5A or 1A) for measurement.

Common Materials

Manganin alloy (for shunts), Silicon steel laminations (for CT cores), Copper windings, Insulating materials (e.g., epoxy, PVC)

Technical Parameters

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.

Components / BOM

Core Part
Provides magnetic path for induction in CTs; typically laminated to reduce eddy currents

Material: Silicon steel
Windings Part
Primary and secondary coils that carry current and induce/produce the measured signal

Material: Copper
Shunt Element Part
Precision resistor that creates voltage drop proportional to current in shunts

Material: Manganin alloy
Insulation Part
Electrical isolation between windings and core, and protection from environmental factors

Material: Epoxy resin or PVC
Terminals Part
Connection points for primary and secondary circuits

Material: Brass or copper

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Current Shunt / CT.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Measurement Circuit (Voltmeter & Ammeter)

View system integration details

Manufacturers of Current Shunt / CT

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Greegoo Electric

Zhejiang, CN

Also makes: Current Transformer (CT), Semiconductor Device, Power Semiconductor and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the difference between a current shunt and a current transformer?

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.

How do I select the correct rated primary current for a CT?

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.

What is accuracy class and why is it important?

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.

What does burden mean in CT specifications?

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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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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)

Current Shunt / CT

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

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