RESOURCES
Introducing the New Toroidal Current Transformer (CTs) 6.5" and 7.5" for Precise Electrical Monitoring and Control
Foster City, CA November 2024 – In a groundbreaking move for the electrical industry, a new range of Toroidal CTs – the 6.5" and 7.5" models – is set to elevate the accuracy and efficiency of current measurement, circuit control, and power monitoring. These precision-crafted transformers are designed to offer reliable, gap-free performance with low-noise operation, making them ideal for safeguarding and regulating electrical systems.
With a broad operational range, the Toroidal CTs can handle primary currents from 50 amps to 6,000 amps and rated voltages up to 600 volts, offering excellent versatility. These transformers support frequencies between 50 Hz and 400 Hz, with secondary currents set at 5.0 amps, making them suitable for a wide variety of applications. The units feature a high insulation level of 0.6kV, with a Basic Impulse Level (BIL) of 10kV Full Wave, ensuring resilience in demanding electrical environments.
Key features of the new Toroidal Current Transformers include:
- Primary Current Range: 50 Amps to 6,000 Amps
- Rated Voltage: 600 Volts
- Frequency Range: 50 Hz to 400 Hz
- Secondary Current: 5.0 Amps
- Insulation Level: 0.6kV, BIL 10kV Full Wave
- Secondary Terminals: 10-32 screw with flat washer, lock washer, and nut
- Thermal Current Ratings: 50:5 to 4000:5, 2.0 @ 30°C, 1.5 @ 55°C; 5000:5 to 6000:5, 1.33 @ 30°C, 1.0 @ 55°C
- Compliance: Manufactured to meet IEC 61869-1 & -2 standards and IEEE C57.13
Notably, the Toroidal CTs offer robust construction and are adaptable to various shapes and mounting options, including both single-phase and three-phase systems. They combine power CT and signal CT functions in a single model, further enhancing their versatility. Molded and waterproof, these transformers are designed for reliable operation in even the harshest environments.
Applications of the Toroidal Current Transformers include: 
- Energy Management Systems
- Over/Under Current Sensing
- Switchgear, Control Gears, and Switchboards
- Circuit Breakers
- Power Transducers
- Protecting Instruments and Power Grid
- Control and Relay Metering Panels
- Motor and Heat Controllers
These new Toroidal CTs are engineered to provide superior performance, offering precise current measurement while reducing the risk of high-voltage currents. Whether used in industrial settings, commercial systems, or complex energy management solutions, these transformers are set to redefine the standard for electrical monitoring and control.
Toroidal CTs are durably built, adaptable to various shapes and mounts, and suitable for single or three-phase systems. They combine power and signal CT functions, are molded, waterproof, and handle primary currents from 50 to 6,000 amps and voltages up to 600 volts. They support frequencies from 50 to 400 Hz with secondary currents at 5.0 amps. The units have a high insulation level of 0.6kV and a BIL of 10kV Full Wave, ensuring durability in tough conditions.
About Astrodyne TDI
Astrodyne TDI designs and manufactures innovative power solutions for demanding applications worldwide. The company’s products include power supplies and EMI filters for industrial, semiconductor manufacturing, medical, consumer appliance, military, and aerospace markets. With over 60 years of power supply design experience, Astrodyne TDI is headquartered in Hackettstown, NJ, and has engineering and manufacturing centers in the USA and China. For more information, visit www.AstrodyneTDI.com.