What Is LMK4(BH)-0.66 Type Current Transformer？
The LMK4(BH)-0.66 is a plastic-cased, indoor current transformer designed for rated voltages up to 0.66 kV and a rated frequency of 50 Hz. It is primarily used for electric current and energy measurement, as well as relay protection in low-voltage circuits. This transformer is suitable for installation in complete switchgear cabinets and can be mounted either on a busbar or on a base plate. It complies with the IEC61869 standard.
Working Conditions of the LMK4(BH)-0.66 type low voltage current transformer
- Installation site: Indoor
- Ambient temperature: –5°C to +40°C
- Ambient humidity: ≤ 80%
- Altitude: ≤ 1000 m
- Atmospheric conditions: No serious impurities
Main Technical Data of the LMK4(BH)-0.66 Series Low Voltage Current Transformer
Note: Other special specification models are supplied according to user requirements
| Product chart | Current ratio (A) | Secondary load(VA) | Cross-core turn number | ||
| 10P5 | 10P10 | 10P15 | |||
| LMK4(BH)-0.66 50 | 200/5 | 5 | / | / | 1 |
| 300/5 | 5 | 2.5 | / | 1 | |
| 400/5 | 10 | 5 | 2.5 | 1 | |
| 500/5 | 10 | 5 | 2.5 | 1 | |
| 600/5 | 15 | 10 | 5 | 1 | |
| 750/5 | 15 | 10 | 5 | 1 | |
| 800/5 | 15 | 10 | 5 | 1 | |
| LMK4(BH)-0.66 60 | 400/5 | 10 | 5 | 2.5 | 1 |
| 500/5 | 10 | 5 | 2.5 | 1 | |
| 600/5 | 10 | 5 | 2.5 | 1 | |
| 750/5 | 10 | 5 | 2.5 | 1 | |
| 800/5 | 10 | 5 | 2.5 | 1 | |
| 1000/5 | 10 | 10 | 5 | 1 | |
| 1200/5 | 10 | 10 | 5 | 1 | |
| 1500/5 | 10 | 10 | 5 | 1 | |
| LMK4(BH)-0.66 80 | 600/5 | 10 | 5 | 2.5 | 1 |
| 750/5 | 10 | 5 | 2.5 | 1 | |
| 800/5 | 10 | 5 | 2.5 | 1 | |
| 1000/5 | 10 | 10 | 5 | 1 | |
| 1200/5 | 10 | 10 | 5 | 1 | |
| 1500/5 | 10 | 10 | 5 | 1 | |
| 2000/5 | 10 | 10 | 5 | 1 | |
| LMK4(BH)-0.66 100 | 800/5 | 10 | 5 | 2.5 | 1 |
| 1000/5 | 10 | 10 | 5 | 1 | |
| 1200/5 | 10 | 10 | 5 | 1 | |
| 1500/5 | 10 | 10 | 5 | 1 | |
| 2000/5 | 10 | 10 | 5 | 1 | |
| 2500/5 | 10 | 10 | 5 | 1 | |
| LMK4(BH)-0.66 130 | 1000/5 | 10 | 10 | 5 | 1 |
| 1200/5 | 10 | 10 | 5 | 1 | |
| 1500/5 | 10 | 10 | 5 | 1 | |
| 2000/5 | 10 | 10 | 5 | 1 | |
| 2500/5 | 10 | 10 | 5 | 1 | |
| 3000/5 | 10 | 10 | 5 | 1 | |
| 3500/5 | 10 | 10 | 5 | 1 | |
Why Choose ZHIMING's LMK4(BH)-0.66 type low voltage current transformer?
High Accuracy & Protection Levels
Available in accuracy classes 10P5, 10P10, and 10P15 to meet various metering and relay protection needs. These classes define the composite error under rated accuracy limit factors (5, 10, or 15 times the rated primary current), ensuring reliable operation during short-circuit faults. For general energy metering, 10P5 provides tight error control; for heavy industrial feeders where higher overloads are expected, 10P10 or 10P15 offer greater margin.
Flexible Mounting Options
Supports both busbar fixed and base plate fixed installation, making it ideal for complete switchgear cabinets. The busbar fixing method allows direct mounting onto the primary busbar without additional brackets, saving space and hardware. The base plate fixing method uses standard screw holes on the transformer casing, enabling secure attachment to any flat surface inside the panel.
Wide Current Ratio Range
From 200/5A up to 3500/5A, with multiple window sizes (Φ50 to Φ130) to accommodate different primary conductors. The Φ50 window suits smaller busbars or single cables, while Φ130 can handle large busbars or multiple bundled conductors. Higher ratios such as 3000/5A and 3500/5A are specifically designed for main incoming feeders in industrial plants or commercial buildings.
Standard Compliance
Manufactured in accordance with IEC61869, ensuring international quality and safety standards. This compliance guarantees that the transformer meets globally recognized requirements for insulation performance, temperature rise limits, short-circuit thermal withstand, and accuracy verification.
Customizable
Special requirements can be accommodated through manufacturer consultation. If your project needs non-standard current ratios (e.g., 2500/1A), higher secondary loads beyond standard VA ratings, different window dimensions, or unusual accuracy classes, our technical team can provide tailored solutions. Customization also extends to special markings, terminal types, or packaging upon request.
FAQ
What is the maximum primary current available for this low voltage current transformer?
The LMK4(BH)-0.66 series supports primary currents up to 3500/5A (with the Φ130 window model). Other models cover 200/5A to 2500/5A.
Can I use this low voltage current transformer outdoors?
No, it is strictly designed for indoor use. Outdoor installation would require additional protection and is not recommended per the specified working conditions.
What do 10P5, 10P10, and 10P15 mean?
These are protection accuracy classes per IEC61869. For example, 10P10 means the transformer has a composite error of ≤10% at 10 times the rated primary current (accuracy limit factor). Higher numbers indicate higher allowable overloads.
How do I specify the correct model when ordering?
You must provide: (1) Model and window width (e.g., LMK4(BH)-0.66 Φ50), (2) Rated current ratio (e.g., 500/5A), (3) Rated output (e.g., 5VA), (4) Accuracy class (e.g., 10P10).
What if my required current ratio or output is not listed in the standard table?
ZHIMING offers customization. Please contact the manufacturer with your special requirements (e.g., non-standard ratio, higher output, or special accuracy) for a tailored solution.
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