Выбор трансформатора тока: 8 полезных советов, которые следует учитывать

Making the right current transformer selection is key to ensuring accurate electrical measurements, system safety, and long-term efficiency.

TOSUNlux provides a diverse range of CE-certified CT models, including low-voltage, panel-mounted, and high-current types, designed for everything from commercial monitoring to industrial protection.

Let’s break down 8 tips to help you select the right CT with confidence.

8 Tips for Selecting the Best Current Transformer That Fits Your Electrical Needs

1. Define the Application Scenario

Start with identifying where and how your CT will operate.

Is it for panel-mounted energy monitoring or heavy-duty industrial protection?

For compact switchboards and distribution panels, MSQ-type low-voltage CTs from TOSUNlux are ideal.

With a rated voltage under 660V and frequency of 50/60Hz, they deliver precise monitoring in small spaces.

For medium-voltage applications, TOSUNlux’s CA-type CTs with a rated voltage of 720V and a capacity range of 5 to 50 VA are reliable for standard measurement tasks.

2. Choose the Correct Current Transformer Class

The current transformer class determines how accurate your readings will be.

Depending on whether you need general monitoring or billing-grade precision:

• Class 0.2–0.5: Suitable for energy metering
• Class 1–3: Best for protection and control systems

TOSUNlux offers all these classes across various CT models—including the CA and MSQ types—ensuring you get the right fit for your use case.

3. Get the Sizing Right

Current transformer sizing should match the expected load current. Undersizing causes saturation; oversizing leads to reduced accuracy.

For high-load industrial applications, TOSUNlux offers the DP-type CTs, with models like:

• DP-23: 100–400A
• DP-58/88: Up to 1000A
• DP-812: Up to 1500A
• DP-816: Up to 5000A

These are perfect for protection circuits in substations and factories.

Meanwhile, MSQ-type CTs provide lower current ratings tailored for control panels and metering cabinets in commercial or light industrial setups.

4. Know the Burden Rating

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The burden (measured in VA) refers to the load on the secondary side of the CT. Exceeding the rated burden can degrade accuracy.

TOSUNlux labels burden ratings clearly.

For example, the CA-type CTs are available in 5 to 50 VA, making them well-suited for consistent readings in light to medium loads.

5. Identify the Measurement vs. Protection Role

Is your CT for current transformer measurement or for protection?

• Use CA and MSQ types for accurate real-time monitoring.
• Use DP-type CTs for high-current protection scenarios where performance under fault conditions matters more than high precision.

Selecting the correct function ensures you don’t compromise on either safety or metering accuracy.

6. Match the Current Transformer Model to the Device

Ensure your current transformer model is compatible with the connected devices—meters, relays, or PLCs.

TOSUNlux CTs typically offer 5A or 1A secondary outputs, with universal connection terminals and mounting configurations.

The DP and CA series allow flexible busbar mounting, while MSQ types support compact DIN-rail installations.

7. Always Verify International Certifications

Global compliance is non-negotiable.

All TOSUNlux current transformers, including MSQ, CA, and DP types, are CE-certified, offering peace of mind for installers working across markets.

This guarantees quality manufacturing, consistent insulation, and safe operation under rated conditions.

8. Leverage Technical Support and After-Sales Services

One of the most overlooked aspects of current transformer selection is support.

With TOSUNlux, buyers receive full technical consultation, model recommendations, and ongoing after-sales services.

Whether you’re sizing a DP-816 for a large plant or selecting an MSQ for a commercial board, their engineers help simplify the process and reduce errors during configuration.

Conclusion: Why TOSUNlux Is the Smart Choice

TOSUNlux offers a complete lineup of current transformers for every application:

• MSQ-type for compact, low-voltage setups
• CA-type for medium-voltage accuracy
• DP-series for high-current industrial use

Backed by CE certification and expert support, TOSUNlux simplifies your current transformer selection from planning to maintenance.

TOSUNlux doesn’t just sell components; it provides smart, complete electrical measurement tools ready for today’s infrastructure demands.

With decades of experience and a global footprint, they help simplify every stage—from product selection to system integration. Контакт TOSUNlux today!