Inquiry Now
Leave Your Message
Products Categories
Featured Products
SFM118 Series Single Phase Multifunction Meter

SFM118 Series Single Phase Multifunct...
SFM472 Series Three Phase Multifunction Meter

SFM472 Series Three Phase Multifuncti...
Three Phase Digital Combined Meter

Three Phase Digital Combined Meter
Multifunctional watch LED

Multifunctional watch LED
Three Phase Digital Voltmeter, Ammeter

Three Phase Digital Voltmeter, Ammeter
SFN-9K6-3UI Digital Combined Meter

SFN-9K6-3UI Digital Combined Meter
Single Phase Multifunctional Power Instrument

Single Phase Multifunctional Power In...
Single Phase Digital Combined Meter

Single Phase Digital Combined Meter
Power factor meter

Power factor meter
Single-phase meter

Single-phase meter
0102030405
CTF2-1 transformer wholesaler .jpg

China CT2 Series Current Transformer - Leading Suppliers & Factory for Electrical Monitoring Solutions

,

A current transformer (CT) is an essential electrical component used for controlling, monitoring, and protecting power supply systems. It accurately measures small, manageable quantities of large alternating current (AC), making it a crucial device in various applications such as power generation, transmission, distribution, and industrial operations. Typically, CTs are integrated with safety relays or sensitive measuring instruments to ensure optimal performance in high-current circuits. As a leading supplier in China, our factory specializes in high-quality current transformers that meet international standards, providing reliable solutions for your electrical needs.

,
    Contact us
    Product Details

    Product Overview

    ⚡ High Precision Metering
    🔒 High Voltage Insulation
    📐 Transformation Ratio Control
    🛡️ Personnel & Equipment Safety

    A CT uses electromagnetic induction and is made up of two windings: a secondary winding with several turns connected to safety or measurement devices, and a primary winding with a few turns connected in series to a high-current circuit. The primary winding receives a lot of current, whereas the secondary winding, which is typically tuned to 5A or 1A for the majority of industrial applications, receives very little. This proportionality, sometimes referred to as the transformation ratio, permits precise current monitoring while shielding personnel and equipment from dangerous voltages.


    CTs require high precision for energy metering, linearity to reduce measurement errors, and enough insulation to maintain a high voltage between windings. Finally, since they allow for more exact current monitoring and issue detection, current transformers are critical to the dependability, efficiency, and safety of contemporary electrical systems.

    ⚠️

    Important: When using a CT, never leave the secondary winding open circuit. An open circuit has the ability to generate extremely high voltages, which can seriously harm electrical equipment and endanger personnel.

    Technical Parameters

    Type Specification (mm) Outline Size
    A B C D E F M
    CTF2-1025 100A/5A 162 71 28 155 100 25 c5*7
    CTF2-1435 250A/5A 202 81 28 195 140 35 c5*7
    CTF2-1835 400A/5A 242 82 28 235 180 35 c5*7
    CTF2-2245 630A/5A 282 92 28 275 220 45 c5*7
    CTF2-3045 1250A/5A 363 92 28 355 300 45 c5*7
    ✅ Accuracy Grade: 1.0 ⚡ Overload Current: ≥1.2% ln

    Frequently Asked Questions

    ❓ What is the working principle of a current transformer (CT)?
    A current transformer operates on the principle of electromagnetic induction. It consists of a primary winding connected in series with a high-current circuit and a secondary winding connected to measuring or protection devices. The current in the secondary winding is proportional to the primary current, defined by the transformation ratio, allowing safe and accurate current measurement.
    ❓ Why should the secondary winding of a CT never be left open circuit?
    Leaving the secondary winding open circuit is extremely dangerous. Without a closed circuit load, all the magnetic flux generated by the primary current passes through the core unimpeded, inducing an extremely high voltage in the secondary winding. This can damage insulation, destroy connected equipment, and pose a serious safety risk to personnel.
    ❓ What accuracy grade do these CT models support?
    The CTF2 series current transformers support an accuracy grade of 1.0, making them suitable for energy metering and industrial measurement applications where precision and linearity are critical for minimizing measurement errors.
    ❓ What is the standard secondary output current for industrial CT applications?
    For the majority of industrial applications, the secondary winding of a CT is standardized to output either 5A or 1A. The CTF2 series models listed here all use a 5A secondary output, making them compatible with standard protection relays, energy meters, and monitoring instruments.
    ❓ What overload current capacity do CTF2 series transformers support?
    The CTF2 series current transformers are designed to handle an overload current of ≥1.2% ln (1.2 times the rated current), ensuring stable performance and protection reliability even under temporary overload conditions in industrial electrical systems.
    ❓ How do I select the right CTF2 model for my application?
    Selecting the correct CTF2 model depends on the rated primary current of your circuit. For example, choose CTF2-1025 for up to 100A, CTF2-1435 for 250A, CTF2-1835 for 400A, CTF2-2245 for 630A, and CTF2-3045 for up to 1250A. Also consider the physical outline dimensions (A–M) to ensure proper installation fit within your electrical panel or enclosure.