Product Overview

Wilmall Split Core Series for Fast, Non-Invasive Installation

Wilmall’s Split Core Current Transformer range is engineered for quick, non-invasive installation in existing electrical systems. These hinged split core CTs enable installers to clamp directly around live conductors or busbars without disconnecting cables, minimizing downtime during retrofit projects.

Core Value Proposition: Hinged Design for Easy Snap-On Installation

The split core design features a robust hinge allowing the transformer to snap securely around conductors. This clamp-on current transformer mechanism is ideal for tight panel spaces and live-line installations, eliminating complex wiring changes and enhancing safety.

Versatile Outputs for Broad Applications

Wilmall split core CTs offer multiple secondary output configurations, including 5A and 1A current outputs as well as voltage outputs at 0–333mV and 1V for precise energy management and power monitoring. This versatility supports a wide range of uses—from revenue-grade metering to sub-metering and industrial automation—with accuracy and reliability.

Key Features & Benefits of Wilmall Split Core Current Transformer

Our Wilmall split core current transformers are built for easy, non-invasive installation and reliable performance, meeting diverse energy monitoring needs worldwide.

Non-Invasive Retrofit Design

• Clamp-on mechanism: Hinged, snap-on design lets you install the CT without disconnecting cables—perfect for live-line setups and tight panel spaces.
• Enables quick retrofit applications without shutting down the system.

Precision Metering

• Accuracy Class: Available in Class 0.5 and 1.0 for revenue-grade energy metering.
• Low phase angle error: Ensures precise current measurement and better power factor calculations.

Safety & Protection

• Built-in over-voltage protection: Zener diodes safeguard the CT against open-circuit voltages, keeping both the device and users safe.
• Minimizes risk during installation and maintenance.

Durability & Build Quality

This durable construction supports secure performance in demanding settings, securing your investment over time.

For advanced sensor options, check our circular residual current transformer for electronic instrument designed for precise current sensing in compact applications.

Technical Specifications of Wilmall Split Core Current Transformer

Our Wilmall split core current transformers cover a wide primary current range to suit various industrial and commercial needs. Here’s a quick look at the key specs:

These hinged split core CTs provide reliable, non-invasive current measurement with consistent accuracy suitable for both revenue-grade metering and energy monitoring. The variety of secondary outputs including 5A, 1A, or low voltage (333mV/1V) options make them compatible across most electrical monitoring setups.

For ensuring safe and durable installation, the units maintain strong dielectric strength and a broad temperature tolerance, perfect for different environments worldwide. This specification package makes Wilmall clamp-on current transformers a solid choice for retrofit and live-line installations.

Dimensions & Window Aperture Selection

Choosing the right split core current transformer starts with matching the CT window size to your cable or busbar diameter. Wilmall offers a range of hinged split-core CT models with apertures designed to fit various conductor sizes easily without disconnecting cables.

• Sizing Guide: Small cables: 10mm aperture for tighter fits
  Medium cables: 24mm or 36mm apertures for common wiring
  Larger busbars or bundles: 50mm aperture to accommodate bigger diameters Model Variants: Each Wilmall split core CT model is tailored with specific amperage ratings that align with its window size. This ensures accurate, non-invasive current measurement across a broad spectrum—from small loads to heavy industrial currents up to 5000A.

By selecting the correct aperture, you make installation smoother and ensure reliable accuracy, especially in retrofit setups where panel space is limited. This clamp-on current transformer approach helps maintain operational efficiency and safety without interrupting your system.

For a related solution that complements the split core design, you might find our rectangular residual current transformer models useful for specialized power quality applications.

Applications & Use Cases for Split Core Current Transformers

Wilmall’s split core current transformers are built to serve a wide range of practical applications across industries, thanks to their non-invasive design and versatile output options.

• Energy Management Systems: Perfect for sub-metering in commercial buildings, these clamp-on current transformers enable easy monitoring of energy usage without interrupting service. This helps facility managers track and optimize power consumption.
• Power Quality Monitoring: By detecting load imbalances and current fluctuations, our hinged split core CTs provide critical data to maintain system stability and prevent downtime in electrical networks.
• Renewable Energy: Designed for solar PV systems and battery storage metering, the split core CT with 333mV or 5A secondary output ensures accurate current sensing for inverters and energy storage applications, supporting efficient green energy management.
• 産業オートメーション： Ideal for motor load monitoring and preventative maintenance, these retrofit current transformers help facilities avoid costly failures by delivering precise, real-time current measurements.

Whether it’s for revenue-grade metering or energy monitoring, our Wilmall split core CTs offer reliability combined with ease of installation — a must-have for modern power monitoring sensors. For detailed specifications and applicable model sizes, you can explore options like our single-phase indoor current transformer that complements these applications perfectly.

Installation & Wiring Configuration

Proper installation and wiring are essential for accurate measurements with Wilmall’s split core current transformers. Pay attention to the P1/P2 orientation—installing the CT with correct directionality ensures reliable power factor readings and consistent phase angle accuracy.

The CTs come with standard lead lengths, typically color-coded to simplify wiring: red and black for polarity, which helps avoid connection errors. This makes integration straightforward in retrofit setups or tight panel spaces.

Safety is key: For 5A secondary CTs, never leave the secondary circuit open when energized, as this can cause dangerous high voltages. In contrast, models with 0–333mV or 1V outputs offer safer open-circuit handling, making them ideal for applications where safety during wiring changes is critical.

For more on installation accessories and wiring connectors, check our detailed guide on industrial remote control transmitters and receivers, which complements energy monitoring setups using these clamp-on current transformers.

Certifications & Compliance

Our Wilmall split core current transformers meet strict global standards to ensure safety, reliability, and environmental responsibility. They are CE certified そして UL Listed/Recognized (UR), giving you confidence in their quality and compliance for international markets. Additionally, the devices adhere to RoHS standards, guaranteeing they are free from hazardous materials and eco-friendly.

These certifications make our hinged split core CTs suitable for non-invasive current measurement in commercial, industrial, and renewable energy applications worldwide. The combination of safety approvals and precise accuracy class ratings supports your use in revenue-grade metering and power monitoring systems.

For similar solutions focusing on high-accuracy split core sensors, check out our high-accuracy mini split core current transformer for energy electricity meter designed specifically for precise energy monitoring installations.

FAQ: Common Questions About Split Core Current Transformers

Here are quick answers to frequently asked questions about Wilmall split core current transformers, covering secondary lead extensions, output types, and ratio selection.

Does extending the secondary lead affect CT performance?

• Yes, it can. Longer secondary leads increase the burden (load) on the CT, which may reduce accuracy.
• To avoid this, keep extension leads as short as possible.
• Use a burden resistor rated correctly to maintain the specified accuracy class.
• Always follow manufacturer guidelines on maximum lead length and burden values.

What’s the difference between 333mV and 5A output CTs?

How to select the right CT ratio?

• Always pick a primary rating higher than your maximum expected load to avoid saturation or damage.
• For instance, if your max current is 350A, choose a CT rated for 400A or 500A.
• This ensures precise metering and safety under load spikes.

For more details on selecting the proper split core CT model, see our open type 250A 1A split core current transformer options.

This quick guide should help you optimize your installation and get the most accurate readings from your Wilmall split core current transformers.

Request a Quote / Download Datasheet

Looking for detailed specs or custom options for your split core current transformer needs? Contact Wilmall’s engineering support team to get tailored volume pricing or custom ratio solutions that fit your project perfectly. Whether you require a hinged split core CT with 5A/1A secondary output or a non-invasive retrofit current transformer with 0–333mV voltage output, our experts are ready to assist.

For quick access to all technical details and model variants, you can download the complete datasheet. This ensures you have the full specifications, including accuracy class ratings, secondary output options, and installation guidelines, right at your fingertips. Reach out today to streamline your selection process and secure the best energy monitor sensor or clamp-on current transformer for your application.