Structured Manufacturing Data (2026)

Current Sensor (Current Transformer)

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Current Sensor (Current Transformer) used in the Electrical Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Current Sensor (Current Transformer) is characterized by the integration of Magnetic Core and Primary Conductor. In industrial production environments, manufacturers listed on CNFX commonly emphasize Silicon steel core construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A device that measures alternating current (AC) in electrical circuits by converting high currents to proportional, lower-level signals for monitoring and protection systems.

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Product Specifications

Technical details and manufacturing context for Current Sensor (Current Transformer)

Definition
A critical component within Grid Monitoring Devices that safely isolates and measures high-voltage AC currents in power transmission and distribution systems. It provides accurate current data for grid operators to monitor load conditions, detect faults, implement protection schemes, and ensure system stability and efficiency.
Working Principle
Operates on the principle of electromagnetic induction. The primary conductor carrying the current to be measured passes through the transformer's magnetic core, inducing a proportional secondary current in the winding. This stepped-down current is then converted to a standardized output signal (typically voltage or digital) for measurement and monitoring equipment.
Common Materials
Silicon steel core, Copper windings, Epoxy resin insulation, Polymer housing
Technical Parameters
  • Rated primary current and transformation ratio (e.g., 100A:5A) (A) Standard Spec
Components / BOM
  • Magnetic Core Part
    Provides the magnetic path for electromagnetic induction and determines the transformation characteristics
    Material: Silicon steel laminations
  • Primary Conductor Part
    Carries the current to be measured through the transformer window
    Material: Copper or aluminum busbar
  • Secondary Winding Part
    Produces the proportional output current through electromagnetic induction
    Material: Copper wire with insulation
  • Insulation System
    Provides electrical isolation between primary and secondary circuits and protects against environmental factors
    Material: Epoxy resin, polymer compounds
  • Terminal Block
    Provides secure electrical connections for input and output signals
    Material: Copper alloy with insulating base

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Current Sensor (Current Transformer).

Current transformer CT sensor high accuracy current transformer for industrial monitoring AC current sensor with silicon steel core current transformer for electrical protection systems epoxy insulated current measurement device CT sensor with polymer housing for durability

Applied To / Applications

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

Grid Monitoring Device
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.2 bar (typical for non-sealed units)
other spec: Frequency range: 50/60 Hz to 400 Hz, Accuracy: ±0.5% to ±3% FS, Insulation voltage: 0.5 kV to 10 kV RMS
temperature: -40°C to +85°C (operating), -55°C to +105°C (storage)
Media Compatibility
✓ Dry air environments ✓ Non-corrosive gas-filled enclosures ✓ Clean indoor electrical panels
Unsuitable: Submerged or high-humidity (>95% RH) corrosive environments without proper IP-rated housing
Sizing Data Required
  • Primary current rating (e.g., 100A, 500A)
  • Secondary output type and range (e.g., 0-5V, 4-20mA, 0-1A)
  • Required accuracy class and burden (load) impedance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Insulation Breakdown
Cause: Moisture ingress, thermal cycling, or contamination leading to reduced dielectric strength and short circuits between windings or to ground.
Core Saturation
Cause: Excessive primary current beyond rated capacity or presence of DC offset causing magnetic saturation, resulting in inaccurate secondary output and potential overheating.
Maintenance Indicators
  • Audible humming or buzzing from the CT housing, indicating loose laminations or internal arcing.
  • Visible discoloration, cracking, or oil leakage (if oil-filled) on the CT body, suggesting thermal stress or seal failure.
Engineering Tips
  • Ensure proper burden (load) matching on the secondary side to prevent overvoltage conditions that stress insulation and core materials.
  • Implement regular infrared thermography scans to detect abnormal heating patterns, indicating issues like poor connections, overload, or insulation degradation before catastrophic failure.

Compliance & Manufacturing Standards

Reference Standards
IEC 61869-2: Instrument transformers - Part 2: Additional requirements for current transformers ANSI C57.13: Standard Requirements for Instrument Transformers DIN EN 60044-1: Instrument transformers - Part 1: Current transformers
Manufacturing Precision
  • Ratio accuracy: +/-0.5% at rated current
  • Phase displacement: +/-30 minutes at rated current
Quality Inspection
  • Insulation resistance test: Minimum 100 MΩ at 500 V DC
  • Accuracy verification test: Ratio and phase angle measurement at multiple current levels

Factories Producing Current Sensor (Current Transformer)

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary application of this current transformer?

This current transformer is designed for measuring alternating current (AC) in electrical circuits, converting high currents to proportional lower-level signals for monitoring, control, and protection systems in industrial and commercial electrical equipment.

What materials ensure the durability and accuracy of this sensor?

The sensor features a silicon steel core for precise magnetic performance, copper windings for efficient signal transmission, epoxy resin insulation for electrical safety and environmental protection, and a polymer housing for mechanical durability and corrosion resistance.

How does this current transformer integrate with protection systems?

By providing accurate, proportional low-level signals from high AC currents, this current transformer enables protection relays and monitoring devices to detect overloads, faults, or abnormal conditions, triggering alarms or circuit interruptions to prevent equipment damage and ensure safety.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Electrical Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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