Product Overview
The BH-0.66 V vertical window-type current transformer is an indoor plastic case low-voltage current transformer designed for current measurement, energy metering, and relay protection in AC systems with rated voltage up to 0.66kV and rated frequency of 50Hz. The product adopts a vertical through-core structure, allowing the primary busbar, round conductor, or cable to pass directly through the rectangular window.
The BH-0.66(V) series is suitable for complete low-voltage switchgear, distribution cabinets, power monitoring panels, metering circuits, and industrial electrical systems. It supports busbar fixing and baseplate fixing installation methods, and the vertical structure is suitable for cabinet layouts where upright busbar installation or compact mounting is required.
Product Type
| Item | Specification |
|---|---|
| Product name | Vertical Window-Type Low Voltage Current Transformer |
| Model series | BH-0.66 V / BH0.66(V) |
| Product structure | Indoor plastic case, vertical through-core / window-type structure |
| Rated voltage class | 0.66kV and below low-voltage AC system |
| Rated frequency | 50Hz |
| Rated secondary current | 5A or 1A |
| Installation location | Indoor |
| Typical applications | Current measurement, energy metering, relay protection, low-voltage switchgear monitoring |
Product Display
Main Applications
- Low-voltage AC distribution systems rated up to 0.66kV
- 380V and 660V indoor distribution cabinets
- Complete switchgear assemblies and control panels
- Energy metering and current measurement circuits
- Relay protection and current monitoring circuits
- Industrial power monitoring, power factor compensation, and intelligent low-voltage distribution systems
- Busbar, round conductor, or cable through-core current sensing applications
Key Technical Features
- Vertical through-core structure: The upright window design is suitable for vertical busbar layouts and compact cabinet installation.
- Indoor plastic case: The enclosed housing provides insulation support, mechanical protection, and convenient assembly inside low-voltage cabinets.
- Flexible installation: Supports busbar fixing and bottom plate fixing, and can be adapted to different cabinet layout requirements.
- Multiple window sizes: Available aperture sizes include 60×30, 80×30, 100×50, 120×50, and 130×50 for different busbar or cable arrangements.
- Measurement and protection use: Suitable for current measurement, energy metering, monitoring, and relay protection circuits.
- Safe terminal connection: The product is commonly equipped with protected secondary terminals for convenient wiring and safer cabinet operation.
Working Principle
The BH-0.66(V) current transformer operates according to electromagnetic induction. When the primary busbar or cable passes through the CT window and carries current, magnetic flux is generated in the magnetic core. The secondary winding outputs a proportional current signal, normally 5A or 1A, for connected meters, relays, or monitoring devices. This allows high primary current to be converted into a standardized low-current signal for measurement, metering, or protection.
Model Designation
The model code can be interpreted as follows:
| Code | Meaning |
|---|---|
| BH | Indoor enclosed current transformer series |
| 0.66 | Rated voltage class: 0.66kV |
| V | Vertical window-type / upright through-core design series |
| 60×30, 80×30, 100×50, 120×50, 130×50 | Window aperture size for busbar, round conductor, or cable installation |
Technical Data
| Item | Specification |
|---|---|
| Rated voltage | 0.66kV / 660V |
| Rated frequency | 50Hz |
| Rated primary current | 600A to 3000A according to catalogue data; other ratios can be confirmed by technical agreement |
| Rated secondary current | 5A or 1A |
| Accuracy class | 0.2, 0.2S, 0.5, 0.5S; subject to selected ratio and order requirements |
| Rated output | 5VA or 10VA according to current ratio and specification |
| Ambient temperature | -5°C to +40°C |
| Installation method | Busbar fixing, bottom plate fixing, or through-core cable installation |
| Applicable standards | GB 1208-2006, IEC 60044-1:2003; project-specific requirements can be confirmed by agreement |
Rated Current, Accuracy and Output Reference
| Rated Primary Current (A) | Rated Secondary Current (A) | Accuracy Class | Rated Output (VA) |
|---|---|---|---|
| 600, 800 | 5 / 1 | 0.2 | 5 |
| 1000, 1500 | 5 / 1 | 0.2S / 0.5 | 5 |
| 2000, 3000 | 5 / 1 | 0.5 / 0.5S | 10 |
Note: Technical parameters beyond the above range can be confirmed through technical agreement between manufacturer and purchaser.
Service Conditions
- Installation location: indoor
- System voltage: 0.66kV and below
- Rated frequency: 50Hz
- Ambient temperature: -5°C to +40°C
- The installation environment should be free from severe vibration, conductive dust, corrosive gas, explosive medium, and heavy pollution.
- For special altitude, humidity, pollution level, installation direction, or cabinet layout requirements, technical confirmation is recommended before ordering.
Standards and Compliance
The BH-0.66(V) vertical low-voltage current transformer is designed for indoor current transformer applications and can be supplied according to GB 1208-2006, IEC 60044-1:2003, and customer-specific technical requirements. For projects requiring updated IEC or GB references, the applicable standard and testing items should be confirmed during technical review.
Installation and Dimensions
The BH-0.66(V) series provides multiple vertical window sizes for different busbar, round conductor, or cable layouts. The following dimensions are for product selection and cabinet design reference. Final dimensions should be confirmed according to the approved drawing before production or batch ordering.
Available Window Sizes and Overall Dimensions
| Model | a | b | h | A | B1 | B2 | H |
|---|---|---|---|---|---|---|---|
| BH0.66(V) 60×30 | 33 | 62 | 125 | 100 | 56 | 73 | 141 |
| BH0.66(V) 80×30 | 33 | 83 | 149.5 | 100 | 56 | 73 | 165.5 |
| BH0.66(V) 100×50 | 54 | 103 | 175 | 124 | 56 | 73 | 191 |
| BH0.66(V) 120×50 | 54 | 122 | 198 | 124 | 56 | 73 | 214 |
| BH0.66(V) 130×50 | 55 | 132 | 204 | 130 | 56 | 73 | 220 |
Unit: mm. Final dimensions are subject to confirmed drawing and selected specification.
Installation and Safety Notes
- Confirm the CT model, current ratio, accuracy class, rated output, and aperture size before installation.
- Check that the busbar, round conductor, or cable size matches the selected CT window dimension.
- Install the CT using busbar fixing or bottom plate fixing according to the cabinet layout.
- Confirm the installation direction and secondary terminal position before wiring.
- Connect the secondary terminals according to the polarity marks and project wiring diagram.
- The secondary circuit of a current transformer must not be open-circuited when the primary circuit is energized.
- Secondary wiring, grounding, and terminal protection should comply with the project specification and local electrical regulations.
- Installation and maintenance should be performed by qualified electrical personnel.
Ordering Information
Please provide the following information when ordering or requesting a quotation:
- Product model: BH-0.66 V / BH0.66(V)
- Window size: 60×30, 80×30, 100×50, 120×50, or 130×50
- Rated primary current and rated secondary current
- Required accuracy class
- Rated output / burden in VA
- System frequency and installation environment
- Installation method: busbar fixing, bottom plate fixing, or through-core cable installation
- Quantity and cabinet application
- Special requirements for terminal layout, labels, drawings, inspection documents, certificates, or packaging
Selection Guidelines
- Confirm system voltage: Select this CT for low-voltage AC systems rated up to 0.66kV.
- Confirm application: Determine whether the CT is used for current measurement, energy metering, monitoring, or relay protection.
- Confirm current ratio: Select the primary current according to the normal operating current and expected load range of the circuit.
- Confirm aperture size: Match the CT window size with the busbar, round conductor, or cable layout inside the cabinet.
- Select accuracy class: Use higher accuracy classes for metering applications and suitable classes for general monitoring or protection circuits.
- Confirm rated burden: The total burden of meters, relays, instruments, and secondary wiring should not exceed the rated output of the CT.
- Confirm installation space: Check overall dimensions, terminal direction, and cabinet clearance before batch installation.