Internal fuse Capacitor

Internal fuse capacitors are specialized devices manufactured by Eaton’s Cooper, used for reactive power compensation, helping to improve the power factor and reduce energy losses for the electrical system. With an integrated internal fuse design, stable operation, and high safety, the product effectively meets technical requirements in various industrial and residential applications.

Impressive technical specifications of internal fuse capacitors

Key Features:

• Capacitor type WITH internal fuses Bushings: 1 or 2 Internal discharge resistors to reduce terminal voltage to 50V within 5 minutes or 75V within 10 minutes Low losses (≤ 0.15 W/kVAr) Terminals are hermetically sealed with high mechanical strength Insulating dielectric: Edisol oil, Non-PCB
• The capacitors support a voltage range from 2.4 to 22.8kV, along with flexible power ratings of 50-500kVAr, suitable for various types of capacitor banks—from small individual systems to large-capacity bank assemblies. This design facilitates easy expansion or replacement without affecting the overall structure of the existing electrical system.
• EX-7Li internal fuse capacitors are equipped with various Basic Insulation Levels (BIL) such as 75kV, 95kV, and 125kV, helping the device operate safely in power grids with high instability or frequent exposure to lightning impulses and overvoltage. Selecting the correct BIL rating for each application not only protects the capacitor but also extends the lifespan of the entire system.
• EX-7Li capacitors use stainless steel enclosures and hermetically sealed terminals, providing waterproofing, corrosion resistance, and the ability to withstand harsh environmental conditions such as high humidity, dust, significant temperature fluctuations, or coastal areas.
• The capacitors are manufactured according to the IEC 60871-1 standard—an international standard applied to power capacitors, ensuring insulation quality, dielectric strength, and operational safety. Additionally, the product has undergone type testing at ASTA lab—a member of STL, verifying its reliability and actual quality under the most stringent testing conditions.

Practical Applications

EX-7Li internal fuse capacitors are used in various electrical systems requiring reactive power compensation to increase operational efficiency:

• Substations (capacitor banks with internal or external fuses)
• Power distribution systems in industrial zones and manufacturing plants
• High-rise buildings and commercial centers with large load systems
• Solar and wind farms (reactive power compensation for inverters and transformers)
• Regional power grids and distribution networks of utility companies
• Electrical systems in environments with high risks of lightning or high surge impulses

Reasons to choose EX-7Li internal fuse capacitors

EX-7Li internal fuse capacitors combine stable performance, safe design, high durability, and compatibility with various systems. With internal fuse technology, the product enhances self-protection, thereby extending lifespan and minimizing operational failures. This is an ideal solution for both new electrical projects and upgrades to existing capacitor systems, especially in industrial projects, renewable energy, and key electrical substations.

EX-7Li internal fuse capacitors are the optimal choice for electrical systems requiring safe, efficient, and long-term stable reactive power compensation. With proven quality and a high-performance design, the EX-7Li not only helps improve cosφ but also provides peace of mind during operation.

Contact us now for technical consultancy and to receive the most suitable power compensation solution for your project!