What is the LMK5(BH)-0.66 Series Low Voltage Current Transformer
The LMK5(BH)-0.66 series low voltage current transformer is a plastic-encased current transformer manufactured by ZHIMING. It is primarily used for current and energy measurement or monitoring in AC circuits with a rated voltage of 0.66 kV or below and a frequency of 50 Hz. This current transformer is designed for installation within electrical inductive systems and supports both horizontal and vertical mounting via busbar fixing or base plate fixing methods. It is available in Type I and Type II phase ratio configurations, offering high accuracy, large capacity, compact size, and cost-effectiveness.
Working Conditions of the LMK5(BH)-0.66 Series Low Voltage Current Transformer
- Rated voltage: ≤ 0.66 kV
- Rated frequency: 50 Hz
- Installation environment: Indoor, electrical inductive systems
- Mounting orientation: Horizontal or vertical
- Mounting methods: Busbar fixing or base plate fixing
- Phase ratio configurations: Type I and Type II
Main Technical Data of the LMK5(BH)-0.66 Series Low Voltage Current Transformer
Note: Other special specification models are supplied according to user requirements
| Current ratio (A) | VA Secondary load(VA) | ||||
| 1class | 0.5class | 0.5Sclass | 0.2class | 0.2Sclass | |
| 150/5 | 5 | 1 | |||
| 200/5 | 5 | 1 | |||
| 250/5 | 5 | 1 | |||
| 300/5 | 5 | 5 | 5 | 5 | 1 |
| 400/5 | 5 | 5 | 5 | 5 | 1 |
| 500/5 | 5 | 5 | 5 | 5 | 1 |
| 600/5 | 5 | 5 | 5 | 5 | 1 |
| 750/5 | 10 | 10 | 10 | 5 | 1 |
| 600/5 | 10 | 10 | 10 | 5 | 1 |
| 1000/5 | 10 | 10 | 10 | 5 | 1 |
Why choose LMK5(BH)-0.66 Series Low Voltage Current Transformer
High Accuracy for Reliable Measurement
This current transformer supports multiple accuracy classes including 1 class, 0.5 class, 0.5S class, 0.2 class, and 0.2S class. The 0.2S and 0.5S classes offer superior performance at low currents, making them ideal for precision energy metering and billing applications. Whether you need standard industrial monitoring or high-end revenue-grade measurement, ZHIMING's current transformer delivers consistent accuracy.
Large Secondary Load Capacity
Depending on the current ratio, the current transformer provides secondary loads of 5 VA or 10 VA. For example, the 750/5A and 1000/5A models offer 10 VA for 1 class, 0.5 class, and 0.5S class, and 5 VA for 0.2 class. This high burden capacity allows longer cable runs between the current transformer and measuring instruments without sacrificing accuracy, simplifying panel layout and field wiring.
Compact Size and Cost-Effectiveness
The plastic-encased design is compact, saving valuable space inside switchgear cabinets. Combined with cost-effective manufacturing, this current transformer offers an excellent price-performance ratio for low-voltage distribution projects, retrofits, and OEM applications.
Flexible Installation Options
The current transformer supports both horizontal and vertical mounting as well as busbar fixing and base plate fixing. Additionally, it is available in Type I and Type II phase ratio configurations, giving engineers the flexibility to adapt the current transformer to different primary conductor arrangements and cabinet layouts.
FAQ
What is the difference between Type I and Type II phase ratio configurations for this low voltage current transformer?
Type I and Type II refer to different primary conductor routing or busbar positioning methods. Type I typically has the primary busbar passing through the center window, while Type II may have offset or multi-tap arrangements. For specific dimensional and wiring differences, please refer to the product outline drawing or contact ZHIMING technical support.
Can this low voltage current transformer be used with a primary current of 1000/5A at 0.2S accuracy?
Yes. According to the technical table, the LMK5(BH)-0.66 current transformer with a 1000/5A ratio supports 0.2S class at a secondary load of 5 VA (the table shows 5 VA for 0.2级 and likely also for 0.2S级; please verify with the manufacturer). The 0.2S class ensures high accuracy even at 1% of rated current, suitable for precision metering.
Is this low voltage current transformer suitable for outdoor installation?
The maximum secondary load depends on the current ratio and accuracy class. For example:
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For 300/5A to 600/5A: max 5 VA for all classes.
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For 750/5A and 1000/5A: max 10 VA for 1 class, 0.5 class, and 0.5S class; 5 VA for 0.2 class.
Exceeding the rated VA may increase measurement error.
Is this low voltage current transformer suitable for outdoor use or harsh environments?
The source text indicates it is a plastic-encased current transformer designed for installation within electrical inductive systems, typically indoors. For outdoor use, additional protection (e.g., weatherproof enclosure) would be required. Please consult ZHIMING for outdoor-rated alternatives.
