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MR Current Transformer
Six standard silicon steel core frames, tape wrapped rather than moulded. The lowest cost way to get a metering core to Class 0.5, widely used across South East Asia, supplied with or without foot and plastic cover.
- Primary current30 A to 5000 A
- Secondary current5 A, 1 A
- Standard approvalIEC 44-1, IEC 185, BS 7626
- Maximum voltage0.72 kV
- Frequency50 to 60 Hz
- Rated load5 VA to 15 VA
- Class3.0, 1.0, 0.5
- Short time thermal currentIth = 60 × Ih
Product Overview
The standard silicon steel core MR current transformer is a measuring current transformer. The accuracy class is designated by the highest permissible percentage current (ratio) error at the rated current prescribed for the class concerned.
The electronic transformer uses standard silicon steel core models with tape wrapping, at low cost. The current transformer for meters can be used with or without foot and plastic cover. It complies with IEC 60044-1 and GB 1208-2006.
Application Scenarios
- Current measurement, monitoring and protection for electrical wiring and equipment
- Current and power measurement for electric motors, lighting, air compressors, heating and ventilation systems, air conditioning equipment and automation control systems
- Current, power and energy monitoring devices
- Relay protection devices
Technical Features
- With or without base mounting
- With or without plastic terminal cover
- Six standard silicon steel core frames
- Low cost construction, widely used in South East Asia
Specifications
Rated power by frame and ratio
| Model | Rated current | Class 0.5 (VA) | Class 1 (VA) |
|---|---|---|---|
| MR-28 | 50/5 | — | 1.5 |
| MR-28 | 60/5 | — | 1.5 |
| MR-28 | 75/5 | — | 1.5 |
| MR-28 | 100/5 | 1.5 | 2.5 |
| MR-42 | 100/5 | 1.5 | 2.5 |
| MR-42 | 150/5 | 1.5 | 2.5 |
| MR-42 | 200/5 | 2.5 | 5 |
| MR-42 | 250/5 | 3.75 | 5 |
| MR-42 | 300/5 | 3.75 | 5 |
| MR-65 | 500/5 | 5 | 5 |
| MR-65 | 600/5 | 5 | 10 |
| MR-65 | 750/5 | 5 | 10 |
| MR-85 | 800/5 | 10 | 10 |
| MR-85 | 1000/5 | 10 | 15 |
| MR-85 | 1500/5 | 10 | 15 |
| MR-85 | 1600/5 | 10 | 15 |
| MR-125 | 2000/5 | 15 | 15 |
| MR-125 | 3000/5 | 15 | 15 |
| MR-125 | 4000/5 | 15 | 15 |
General data
| Parameter | Value |
|---|---|
| Primary current | 30 A to 5000 A |
| Secondary current | 5 A, 1 A |
| Standard approval | IEC 44-1, IEC 185, BS 7626 |
| Maximum voltage | 0.72 kV |
| Frequency | 50 to 60 Hz |
| Rated load | 5 VA to 15 VA |
| Class | 3.0, 1.0, 0.5 |
| Short time thermal current | Ith = 60 × Ih |
| Rated security coefficient | FS < 5 |
Questions Buyers Ask
What is a tape wrapping current transformer?
The toroidal core is wound and then wrapped with insulating tape rather than moulded into a plastic case. It is the cheapest reliable way to build a metering core, and it is why the MR family sells in price sensitive markets.
Can I get MR with a mounting foot and a cover?
Yes. The series is offered with or without base mounting and with or without a plastic terminal cover.
Which standards does MR meet?
IEC 60044-1 and GB 1208-2006, with the ratings quoted against IEC 44-1, IEC 185 and BS 7626.
Compare With These Frames
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Send the ratio, accuracy class, burden and conductor size. An engineer confirms the frame and the price.