The Surge Arrester & Cutout combines two electrical protection devices into a single integrated unit for high and low voltage distribution systems. The surge arrester protects equipment from transient overvoltages caused by lightning strikes or switching operations, while the fuse cutout disconnects circuits during short circuits or overloads. This combined package provides comprehensive over-voltage and overcurrent protection for electrical networks.
The unit features a zinc oxide resistor disc within a mold-on polymer housing that provides non-linear voltage limiting characteristics. The fuse cutout section includes an insulating body (porcelain or polymer), a fuse holder containing replaceable fuse links that drop to indicate disconnection, and the fuse link itself which melts under overcurrent conditions. Both components maintain insulation protection and durability in outdoor environments.
During normal operation, the surge arrester remains inactive with minimal current flow. When overvoltage events occur, it rapidly conducts high voltage impulses to ground, limiting amplitude before restoring to its original state. Simultaneously, the fuse cutout provides overcurrent protection by melting its fuse element when excessive current generates heat, with some models incorporating arc extinction chambers for load current switching.
Applications include installation on distribution transformer high-voltage sides, 10kV power distribution network branch and trunk lines, and electrical equipment control systems. Rated voltages range from 3kV to 38kV, with continuous currents of 100A to 300A and interrupting ratings up to 16kA. The compact design, corrosion resistance, and hydrophobic properties reduce maintenance requirements while ensuring reliable performance across diverse environmental conditions.
Your Trusted Supplier for Surge Arrester & Cutout Solutions
RaxPower is a professional lightning arrester manufacturer committed to designing, developing, and manufacturing high-quality lightning arrester products. With over 21 years of experience in the electric utility industry, our products have a global presence, serving various countries worldwide.
The Surge Arrester & Cutout provides over-voltage and over-current protection in a single package, combining these units for easier installation, handling, and procurement to lower total installed costs. Utilizing advanced zinc oxide technology and our state-of-the-art hot forging processes, the arrester ensures superior protection performance with stable and reliable operation, featuring light weight and pollution resistance.
Each product is crafted with precision and undergoes rigorous quality control, including load testing and galvanization checks, to meet international standards. Our commitment to high-quality products is supported by a team of professional technicians and engineers, driving innovation and efficiency. We offer customized lightning arrester solutions and comprehensive after-sales service and technical support, ensuring optimal performance for your specific needs.
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Frequently Asked Questions (FAQS)
What is a surge arrester and fuse cutout combo unit, and how does it function?
A surge arrester and fuse cutout combo unit is an integrated electrical device that provides both overvoltage and overcurrent protection. The surge arrester component protects equipment from high transient overvoltages during lightning strikes or switching events by directing impulse currents to earth and limiting voltage amplitude. The fuse cutout component (also called a dropout fuse) disconnects circuits when current exceeds specified values, with fuse elements that melt to protect against short circuits and overcurrent. Under normal voltage, the arrester remains inactive, but during overvoltage events it acts immediately then restores to normal operation once the event passes. The cutout consists of an insulating body (porcelain or polymer), a fuse holder tube that drops when disconnected, and replaceable fuse link elements.
What are the advantages of using an integrated combo unit versus separate components?
The integrated design provides comprehensive protection in a compact package, offering easier installation, handling, and procurement. This lowers total installed costs by reducing labor and simplifying the process for utilities and installers. It also streamlines maintenance by consolidating two critical protection functions into a single unit.
What are the typical electrical ratings available?
For the cutout, typical ratings include voltages of 15 kV, 27 kV, or 38 kV, with BIL (Basic Insulation Level) of 110-150 kV, continuous current of 100-300 A, and interrupting capacity (asymmetrical) of 8000-16000 A. The arrester is available in Heavy Duty, Pole Riser, and Normal Duty types, with voltage ratings of 9 kV, 10 kV, 12 kV, 18 kV, or 21 kV.
What features enhance installation and durability?
The combo features fast, inexpensive installation with arresters utilizing mold-on polymer housing for an ultimate seal against moisture ingress. This ensures reliability in various environmental conditions. The unit inherits benefits of polymer or porcelain cutouts, including impact resistance and stable performance for outdoor use, reducing long-term maintenance needs.
What customization options are available?
Options include XS Polymer or porcelain cutouts, conductor connectors (Parallel Groove or Eye-bolt designs), and blade designs for switching applications. These allow flexibility in installation and compatibility with different system requirements. We also provide comprehensive OEM and ODM solutions, offering one-stop customized services from product design and prototype testing to mass production, tailoring products to exact specifications for performance, dimensions, or application-specific features.
How do you ensure reliability, compliance, and on-time delivery for large projects?
With 21 years of electrical manufacturing experience, we implement strict quality control and multi-stage testing to ensure international standards compliance. Products undergo rigorous checks including load and gauge tests, and have passed SGS tests and authoritative certifications. We utilize advanced production lines and optimized supply chain management with automation processes for efficient manufacturing, enabling us to handle bulk orders reliably and meet urgent timelines without compromising quality.
How do you maintain competitive pricing across your product range?
We offer a broad catalog supported by efficient manufacturing processes and automation that reduce costs. By optimizing production and supply chain management, we lower total installed costs and ensure competitive wholesale pricing while maintaining product quality and variety across different types and ratings.
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