Overview
The BH-0.66 V vertical window-type current transformer is an indoor, plastic-cased low-voltage current transformer designed for AC systems up to 0.66kV and 50Hz. It features a vertical through-core structure that allows primary conductors—such as busbars, round cables, or rectangular bars—to pass directly through its window without electrical connection. This design enables safe, non-intrusive current sensing for measurement, metering, and protection applications.
Ideal for integration into low-voltage switchgear, distribution cabinets, and power monitoring panels, the BH-0.66(V) series supports both busbar-fixed and baseplate-fixed mounting. Its upright orientation optimizes space in compact or vertically arranged cabinet layouts, while the insulated plastic housing ensures safety and mechanical stability during operation.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| Rated voltage | 0.66kV |
| Rated frequency | 50Hz |
| Secondary current | 5A or 1A |
| Primary conductor type | Busbar, cable, or round conductor |
| Installation environment | Indoor |
| Insulation class | Low-voltage, plastic case |
| Window aperture options | 60×30, 80×30, 100×50, 120×50, 130×50 mm |
| Application category | Measurement, metering, relay protection |
Model Designation
- BH: Indoor enclosed current transformer series
- 0.66: Rated voltage class of 0.66kV
- V: Vertical window-type (upright through-core) design
- 60×30, 80×30, 100×50, 120×50, 130×50: Available window aperture dimensions (mm) for conductor passage
Construction
The BH-0.66 V current transformer features a robust plastic case made from flame-retardant, high-insulation thermoplastic material suitable for indoor use. The core is constructed from high-permeability silicon steel laminations to ensure accurate current transformation with minimal losses. Windings are tightly wound and encapsulated for mechanical stability and thermal performance. The vertical window-type structure provides a clear, unobstructed path for primary conductors, while secondary terminals are recessed or shielded for operator safety during installation and maintenance. The entire assembly is designed for reliable operation in standard low-voltage industrial and commercial environments.
Technical Parameters
Service Conditions
- Installation location: indoor
- System voltage: 0.66kV and below
- Rated frequency: 50Hz
- Ambient temperature: -5°C to +40°C
- Environmental restrictions: The installation environment should be free from severe vibration, conductive dust, corrosive gas, explosive medium, and heavy pollution.
- Special conditions: For special altitude, humidity, pollution level, installation direction, or cabinet layout requirements, technical confirmation is recommended before ordering.
Technical Parameters
The BH-0.66 V vertical window-type current transformer features a plastic case and is designed for indoor use in low-voltage systems up to 0.66kV. Key electrical and mechanical specifications are detailed below.
Technical Data
| 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 |
Installation & Wiring
Outline Dimensions
The outline dimensions correspond to the dimensional parameters listed in the table above (a, b, h, A, B1, B2, H). These dimensions are provided for cabinet layout and mounting reference. Always verify final dimensions against the approved engineering drawing before production or installation.
Wiring Diagram
The secondary terminals are clearly marked with polarity indicators (typically S1 and S2). Connect S1 toward the power source side and S2 toward the load side, following the project wiring diagram. Ensure correct polarity alignment to maintain measurement accuracy and protection coordination. The secondary circuit must never be left open when the primary conductor is energized.
Selection & FAQs
Selection Guide
- Select the 600A–3000A ratio from maximum operating current and required metering range.
- Choose a 60×30mm to 130×50mm vertical window with adequate conductor and insulation clearance.
- Specify a 1A or 5A secondary and the available 0.2, 0.2S, 0.5, or 0.5S class.
- Calculate total secondary burden and confirm whether the selected model provides 5VA or 10VA.
- Choose busbar or baseplate mounting and verify orientation, polarity, grounding, and terminal access.
Frequently Asked Questions
Q1: Can this 0.66kV current transformer be installed outdoors?
No, it is strictly designed for indoor installation. The plastic case requires environments free from conductive dust, corrosive gas, and heavy pollution. For outdoor applications, alternative models are subject to technical confirmation.
Q2: Which accuracy class is suitable for energy metering?
The 0.2S or 0.5S accuracy classes are ideal for precise energy metering. These classes ensure high accuracy across varying load conditions up to 3000A primary current. Confirm your specific metering requirements with our engineers.
Q3: What is the rated output for 2000A primary current?
For 2000A and 3000A rated primary currents, the standard rated output is 10 VA. Lower primary currents like 600A to 1500A feature a 5 VA rated output. Custom burden requirements are subject to factory confirmation.
Q4: Can we customize the installation direction for tight cabinet layouts?
Yes, custom installation directions and specific cabinet layout requirements are available. Standard models are designed for vertical window-type mounting. Please provide your exact dimensional constraints for technical confirmation before ordering.
Q5: Are specific factory test reports provided with the shipment?
Test documentation and specific certifications are subject to project confirmation. We do not include unverified test reports by default. Please specify your required factory tests when placing your inquiry.
Q6: What applications is this vertical window-type CT designed for?
It is designed for current monitoring and measurement in low-voltage systems up to 0.66kV at 50Hz. Common applications include indoor switchgear and power distribution panels. Confirm your specific application voltage with our technical team.
Q7: Which secondary current options are available for this manufacturer’s CT?
This transformer offers both 5A and 1A rated secondary current options. The choice depends on your connected relay or meter burden and cable distance. Specify your preferred secondary current during the ordering process.