Product Overview
High-Accuracy Wound Current Transformer from Subian Electric’s Xuzhou Factory
The LMZK type of current transformer is being used in the electrical supply equipment where accurate current conversion is required for regulating, measuring and protection purposes. Model LMZK 300/5A is a common specification that is used in distribution panels and switch-gear systems and is offered from the Subian production plant to distributors and project buyers across the globe.
Applications & circuit protection
The LMZK 300/5A CT is suitable for AC distribution circuits that require reliable current measurements for safety instrumentations and relays. Its particular design ensures constant accuracy within its operational range.
- Measuring panels: provides a current signal to kilowatt-hour meters and digital devices.
- Protection systems: provided with the current measurements to operate overcurrent and short circuit relays in distribution boards.
- Switchgear devices: installed in low voltage and medium voltage switchboards and equipment of makers.
- Industries: Provides measurement for motor, transformer, and feeder loading.
Construction & operating reliability
The LMZK is made with a wound primary winding on a highly permeable core, allowing for reliable ratio accuracy and minimal phase error. The clearly labelled terminals and compact design simplify wiring in the panel.
- Wound primary ensures an accurate turns ratio and a consistent output of 300/5A.
- The use of a highly permeable core minimizes errors in accordance with the rated burden.
- The labeled primary and secondary terminals allow for fast installation.
- The compact design is useful for space-efficient installation.
- Meets the standards set forth in standards IEC 60044-1 / IEC 61869.
Technical Parameter
| Parameter | Value |
| Rated primary current | 300 A |
| Rated secondary current | 5 A |
| Transformation ratio | 300/5 (60:1) |
| Accuracy class | 0.5, 0.2S (metering); 5P, 10P (protection) |
| Rated burden | 10 VA / 15 VA / 20 VA |
| Rated frequency | 50/60 Hz |
| Insulation level | Indoor, LV/MV distribution |
| Application | Measurement, metering, protection and control circuits |
Current Transformer Price & Factory Quote
The cost of CT is determined by factors like ratio, accuracy class, burden, insulation, and quantity. The factory price list for our Wound Current Transformers takes into account the volume based prices for the panel manufacturers as well as distributors.
- Standard ratios including from the price list
- Multi-ratio and custom accuracy prices depending on the order
- Container prices available
CT Wiring & Secondary Connection
The Wound Current Transformer has standard primary terminal and secondary terminal designations. The secondary circuit must be connected to the relay or instrument in proper polarity, and must never be open-circuited while in service.
- P1/P2 and S1/S2 notations according to industry standards
- Polarity indications for proper connection
- Secondary circuit provision available upon request
Compare CT Options
Choose the instrument transformer that fits your scheme:
| Feature | This CT | Alternative |
| Ratio | As specified | Other ratios available |
| Accuracy | Per class | 0.2 / 0.5 / protection class |
| Insulation | Epoxy cast / oil | Indoor or outdoor design |
| Application | Metering / protection | Multi-ratio or special duty |
Export Markets & Country Compatibility
Transformer instruments are distributed internationally among manufacturers and retailers of switchgear, and they are prepared according to the needed ratio, precision and necessity of the exporting market.
CT Dimensions, Weight & Packing
Size and weight are determined by the ratio, the type of insulation, and installation type. Units have compact size suitable for mounting on the panel or by cables with terminals protected during transport. Dimension drawings come together with the technical papers of the product.
- The compact size for panel installations
- The terminals are secured in transport
- The dimension drawing is provided according to the model
Standards & certifications
The LMZK wound current transformer was created following the requirements of IEC 60044-1 and IEC 61869. Type-tests and routine-tests documents can be provided per the requirements of the project and target market.
- Standard of performance: IEC 60044-1/IEC 61869 series.
- Accuracy verification according to accuracy class 0.5/5P.
- Manufactured according to standard markings for the terminals and polarity.
- Applicable for installation in switchgear equipment.
OEM & B2B supply support
As an expert in manufacturing power equipment, Subian Electric aids all types of distributors, OEMs and electrical contractors with CT selection, samples, technical documents and commercial quotations.
If LMZK 300/5A configuration is not suitable for your project, please let us know the ratio, accuracy class, burden and the number of transformers you need and we will suggest a proper current transformer configuration.
- Samples provided for product evaluation.
- We can meet flexible project quantities for B2B buying.
- We provide OEM and ODM assistance to properly suit your project needs.
- We provide custom marking, branding and packaging services.
- We provide technical documents and applicable certifications.
Frequently Asked Questions
What is a 300/5A wound current transformer used for?
It converts a primary input of 300A to a reduced valued output of 5A to measure the readings of electrical parameters accurately and safely in a distribution network connection.
What accuracy classes are available?
The standard accuracy classes are 0.5 and 0.2S for metering operations and 5P and 10P for protection applications. Depending on the working requirements of the downstream devices, the apparatus’s appropriate accuracy class will be decided.
How is the LMZK current transformer installed?
It is fitted in distribution switchboards and connected where the bus and protected measuring devices connect.
Can I request samples or OEM service?
Indeed. You can order the samples and OEM/ODM service in accordance with a good B2B project from the manufacturer. Please inform about the parameters, accuracy class, load, quantity, and market of your order.
