CTHW9 Outdoor waterproof current transformer is designed for reliable current acquisition in low-voltage power distribution systems, especially where outdoor exposure, retrofit limitations, and continuous operation are major concerns. As a professional China manufacturer and supplier, Junray Electrical develops the CTHW9 series with a split-core structure, symmetrical dual-screw locking mechanism, high-permeability silicon steel core, and IP65 protection to support accurate monitoring without requiring cable disassembly or system shutdown.
The growing demand for intelligent electricity management has made reliable current measurement essential in industrial facilities, commercial buildings, outdoor distribution boxes, and smart power networks. Traditional current transformers can be difficult to install when existing cables cannot be disconnected or when equipment operates continuously.
The CTHW9 Outdoor waterproof current transformer addresses these challenges through a clamp-on installation structure and weather-resistant construction. Its multiple aperture options support low-voltage cables of different diameters, while the high-permeability grain-oriented silicon steel core helps provide stable current acquisition. Depending on the configuration, the transformer can support metering applications with Class 0.5 or Class 1 accuracy or be customized for zero-sequence residual-current detection.
A current transformer, commonly called a CT, converts the current flowing through a primary conductor into a measurable secondary signal that can be used by meters, monitoring systems, protection equipment, and intelligent power-management platforms.
The CTHW9 Outdoor waterproof current transformer is specifically developed for low-voltage cable monitoring and retrofit applications. Unlike conventional through-hole CTs that may require cable disconnection or substantial modification, its split-core construction allows the device to be opened, positioned around an existing cable, and securely closed.
This makes it particularly valuable when electrical infrastructure must remain operational. Industrial production lines, commercial facilities, logistics centers, and outdoor distribution systems can therefore introduce additional current-monitoring points with substantially less disruption.
According to Junray Electrical's product information, the CTHW9 series is designed for applications including low-voltage power distribution metering, energy consumption monitoring, residual-current protection, fire-safety power monitoring, and intelligent power-distribution systems.
The CTHW9 uses a symmetrical dual-screw locking mechanism. During installation, the two sides can be tightened alternately, helping distribute mechanical force evenly across the transformer housing.
This design promotes close contact at the core interface and reduces potential alignment problems. Locking pins also help prevent the transformer from slipping or rotating around the cable, which is particularly useful in environments subject to vibration from motors, fans, and other equipment.
Different electrical systems use different cable diameters, so a one-size-fits-all CT is rarely practical. The CTHW9 series provides different internal aperture sizes for matching different low-voltage cables.
The transformer uses a grain-oriented silicon steel core with high magnetic permeability and low magnetic loss. This supports a broad linear operating range and helps maintain stable measurement performance in environments where electromagnetic interference may be present.
For measurement applications, the CTHW9 can be configured for Class 0.5 or Class 1 current acquisition. For protection-oriented projects, it can also be customized as a zero-sequence current transformer for residual-current detection.
Outdoor electrical equipment must withstand moisture, dust, temperature changes, and long-term environmental exposure. The CTHW9 uses high-strength flame-retardant engineering plastic for its housing and vacuum epoxy resin potting internally.
The resulting IP65-rated structure provides protection against dust ingress and water jets, helping the transformer operate reliably in outdoor distribution boxes, industrial plants, underground utility tunnels, and humid electrical shafts.
The CTHW9 also incorporates several installation-oriented details:
When purchasing a current transformer, electrical engineers should evaluate more than the nominal current. Aperture size, accuracy, intended function, installation environment, and secondary configuration all affect whether a CT is appropriate for a specific project.
| Item | CTHW9 Characteristics | Typical Application Value |
|---|---|---|
| Product Type | Outdoor waterproof split-core current transformer | Low-voltage cable monitoring |
| Current Range | Approx. 5A–4000A, depending on model | Small to high-current circuits |
| Accuracy | Class 0.5 or Class 1 for metering configurations | Energy monitoring and measurement |
| Core Material | Grain-oriented silicon steel | Stable magnetic performance |
| Protection Rating | IP65 | Outdoor and humid environments |
| Installation | Split-core clamp-on design | Existing-system retrofit |
| Customization | Ratio, aperture, output and zero-sequence parameters | Project-specific requirements |
Because exact electrical parameters depend on the selected model and application, buyers should confirm the required current ratio, cable outside diameter, secondary output, accuracy class, and protection requirements before placing an order.
The combination of split-core installation and environmental protection makes the CTHW9 suitable for a broad range of power-monitoring scenarios.
Older factories and commercial buildings may have functioning distribution systems without sufficient sub-metering. Installing additional CTs can provide circuit-level current data without extensive modification to existing cables.
Production lines, air compressors, utility equipment, and other large electrical loads can be monitored individually. Current data can then support energy statistics, load analysis, and energy-efficiency improvements.
When configured as a zero-sequence current transformer, the device can detect residual current and work with leakage protection equipment. This makes it useful for electrical safety monitoring.
Fire-safety power circuits require reliable operating-condition monitoring. CTHW9 can be incorporated into monitoring architectures that track current and residual current in relevant distribution circuits.
Current transformers are fundamental sensing components for digital power systems. CTHW9 measurement signals can be integrated with power monitoring platforms and IoT terminals to support remote data collection, trend analysis, and early fault detection.
The split-core structure is intended to simplify field installation, but electrical work must always be performed by appropriately qualified personnel following applicable safety procedures.
One important safety requirement is that the secondary circuit of a current transformer must not be left open-circuited while the primary circuit is energized. An induced high voltage can create serious safety hazards. Appropriate CT shorting and testing procedures should therefore be followed during installation and maintenance.
For engineers and procurement teams comparing current transformer suppliers, the following factors should be checked before selecting a model:
A professional China current transformer manufacturer should also be able to provide technical selection assistance rather than simply supplying a standard component.
A smart logistics park retrofit project in Xiaoshan, Hangzhou, demonstrates the value of split-core current-sensing technology in an operating facility. The site contained 172 low-voltage distribution circuits and had annual electricity costs exceeding RMB 3.2 million. Because cold-chain operations and automated sorting could not tolerate prolonged outages, traditional cable-disconnection retrofit methods were impractical.
The project used split-core current transformers to establish circuit-level monitoring without interrupting power. The resulting system supported zonal electricity accounting, abnormal-load alerts, and energy-consumption analysis.
| Project Factor | Reported Result |
|---|---|
| Monitoring Points | 172 low-voltage circuits |
| Average Installation Time | About 8 minutes per unit |
| Retrofit Cost Reduction | Approximately 35% |
| Monthly Energy Savings | Approximately 18,000 kWh |
| Projected Annual Electricity Cost Savings | More than RMB 200,000 |
| Post-Retrofit CT Integrity | 100% as of July 2026 |
The project illustrates an important principle: for an operating facility, the value of a current transformer is not limited to measurement accuracy. Installation efficiency, system continuity, space adaptability, environmental protection, and compatibility with intelligent monitoring platforms can all influence the total project value.
For electrical monitoring equipment, consistent manufacturing quality is essential because measurement errors or insulation problems can affect downstream monitoring and protection functions.
Junray Electrical states that its CTHW9 series undergoes testing before shipment, including accuracy calibration, power-frequency withstand-voltage testing, and insulation-performance checks. The company also provides customization for current ratios, aperture dimensions, output configurations, and zero-sequence parameters.
The product is supported by a professional technical team for model selection and after-sales technical assistance, and the stated product warranty is one year. These factors can be particularly valuable for engineering contractors and distributors purchasing current transformers for multiple project configurations.
The CTHW9 combines a flame-retardant engineering-plastic housing with vacuum epoxy resin potting and an IP65 protection rating. Its sealed construction helps protect internal components from dust, moisture, and corrosion in suitable outdoor installations.
No. Its split-core structure is designed to clamp around an existing low-voltage cable, which can significantly simplify retrofit projects where cable cutting or prolonged power interruption is undesirable.
Depending on the selected model and configuration, the series is designed for current acquisition applications ranging from approximately 5A to 4000A. The correct ratio should be selected according to the actual circuit requirements.
Yes. The product can be customized as a zero-sequence current transformer for residual-current detection and can be paired with appropriate leakage-protection or fire-safety monitoring equipment.
Measure the actual outside diameter of the cable and select an aperture that allows the cable to sit properly within the CT without excessive clearance or mechanical interference. For project-specific selection, consult the manufacturer with the cable dimensions and current requirements.
Yes. Junray Electrical states that current ratios, aperture sizes, output configurations, and zero-sequence parameters can be customized according to project requirements.
The CTHW9 Outdoor waterproof current transformer combines split-core installation, symmetrical dual-screw locking, high-permeability magnetic-core technology, IP65 protection, and flexible configuration options to address the practical challenges of modern low-voltage power monitoring. Its ability to support retrofit projects without cable disassembly makes it especially relevant for industrial facilities, commercial buildings, outdoor distribution systems, energy-management projects, and smart power applications.
For buyers looking for a reliable China supplier, manufacturer, or factory for customized current transformer solutions, Junray Electrical can provide product selection guidance and project-oriented customization. If you are planning a new power monitoring system or upgrading an existing distribution network, contact us with your current ratio, cable diameter, accuracy requirements, installation environment, and application scenario to receive a suitable CTHW9 solution and professional technical support.
