Current Transformers for Measuring, Protecting Circuitry

Current transformers are used to measure current in circuitry and ensure it is scaled down to a safe low level. In China, these passive components are available in various specifications to suit requirements in sensors, meters, energy monitoring devices, power supplies and other applications.

In mainstream supply are current transformers with a rated primary current of 0 to 5,000A, primary and secondary ratio of up to 1:2,500, operating frequency of 20 to 400Hz and operating temperature range of -25 to 85 C. They comply with industry safety standards such as UL, CE, IEC and RoHS.

Chinese manufacturers can customize current transformers and, to meet changing requirements, they continue to enhance their capability to make miniaturized types with high sensitivity and stability. These low-profile designs match the latest upgrades in the automotive, smart grid and smart metering sectors.

The main materials used in the production of current transformers are cores, resins, wires and plastic cases. Chinese companies obtain them from domestic providers unless customers require other sources.

In the past 12 months, the cost of these inputs did not fluctuate much, enabling manufacturers to keep the prices of current transformers unchanged. Some lowered their quotes to win more orders. This stability is expected to persist through 2024, according to suppliers interviewed by Global Sources.

Current transformer in 30 to 1,000A versions

Company: Anhui Shirui Electronic Technology Co. Ltd

The SRE-29XXX from Anhui Shirui is a low-profile, compact current transformer with a wide linearity range for output current and a low phase shift error. Based on current rating, there are 30, 50, 100, 200, 300, 500 and 1,000A variants, all RoHS-compliant.

MOQ: 100 units

Lead time: 7 days

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Low-profile, compact current transformer

Company: Anhui Shirui Electronic Technology Co. Ltd

Anhui Shirui’s SRE-31XXX current transformer is available in current ratings of 30, 50, 100, 200, 300, 500 and 1,000A. This RoHS-compliant passive component, in a low-profile and compact configuration, has a wide linearity range for output current and a low phase shift error.

MOQ: 100 units

Lead time: 7 days

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Current transformer, 20 to 400Hz operating frequency

Company: Shaanxi Shinhom Enterprise Co. Ltd

An RoHS-compliant current transformer from Shaanxi Shinhom, the Shinhom-190571322-5371 has an operating frequency range of 20 to 400Hz, insulation resistance of more than 100Mohms at 500VDC and operating temperature of -25 to 85 C. It undergoes a hipot test at 4,000V, 1mA for 60sec and has IEC 60044-1 certification based on 0.1, 0.2 and 0.5 accuracy classes.

MOQ: Negotiable

Lead time: 15 days

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Current transformer, >100Mohm insulation resistance at 500VDC

Company: Shaanxi Shinhom Enterprise Co. Ltd

The Shinhom-19059081300 from Shaanxi Shinhom is a current transformer with 20 to 400Hz operating frequency range, more than 100Mohm insulation resistance at 500VDC and -25 to 85 C operating temperature. The hipot test performed is at 4,000V, 1mA for 60sec. This RoHS-compliant component has IEC 60044-1 certification based on 0.1, 0.2 and 0.5 accuracy classes.

MOQ: Negotiable

Lead time: 15 days

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Current transformer, 30ohm load resistance

Company: Shenzhen Belta Technology Co. Ltd

Shenzhen Belta’s CTF16T-5k-100-019 current transformer has 100A input and 40mA output signal, 50/60Hz frequency, 30ohm load resistance, 0.2 percent accuracy and -20 to 50 C operating temperature. Its hipot testing is done at 3,000VAC, 50Hz, 1mA for 10sec.

MOQ: 500 units

Lead time: 15 days

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Current transformer, 400A input, 80mA output signal

Company: Shenzhen Belta Technology Co. Ltd

The SCT30L-5K-400 400A/80mA-18 from Shenzhen Belta is a current transformer with 400A input and 80mA output signal, 50 to 60Hz nominal operating frequency and -40 to 50 C operating temperature.

MOQ: 500 units

Lead time: 15 days

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