RW4 Drop-Out High Voltage Fuse (10–15kV)

Overhead Line and Transformer Branch Protection with Visible Isolation

The RW4 drop-out fuse is a 10–15kV class overhead protection device used to disconnect transformers, capacitor banks, or line sections from the power grid during overcurrent or short-circuit events. Designed for rural distribution systems and pole-mounted substations, it combines fault protection with visible mechanical disconnection.

The fuse link melts under fault conditions, allowing the carrier to drop and provide a clear open-circuit indication, making RW4 fuses essential for safe maintenance and fast fault identification.

🔧 Key Features

Rated Voltage: 10kV / 11kV / 15kV
Rated Current: 100A / 200A
Breaking Capacity: Up to 8kA
Fuse Link Types: T, K, S-speed (2A–200A range)
Housing Options: Porcelain or polymer insulator
Installation: Pole-mounted (vertical orientation)
Standards: IEC 60282-2 / GB 15166.3-2007

🌍 Application Scenarios

Protection of pole-mounted distribution transformers
Disconnection of capacitor banks on 10–15kV lines
Backup protection for reclosers and sectionalizers
Rural feeder branch disconnection and fault isolation
Compact substations requiring visible fault indication

RW4 is widely used in rural electrification, municipal distribution grids, and temporary construction supply lines due to its low cost and fast reset capability.

📊 Technical Parameters

Parameter	Specification
Rated Voltage	10 / 11 / 15kV
Rated Current	100A / 200A
Breaking Capacity	8kA (at rated voltage)
Power Frequency Withstand	42kV / 1 min (dry)
Lightning Impulse Withstand	75kV
Fuse Link Range	2A–200A (replaceable)
Insulator Material	Porcelain / Silicone Polymer
Mounting Type	Crossarm or pole clamp
Operating Temperature Range	–40°C to +50°C

RW4 Drop-Out High Voltage Fuse (10–15kV)

🧱 Product Highlights

Drop-out carrier design provides a visible fault indication
Field-replaceable fuse links allow for fast service restoration
Corrosion-resistant fittings for long-term outdoor use
Optional arc-extinguishing tube for enhanced fault handling
Polymer housing option offers UV, salt fog, and vandal resistance
Compatible with standard hot stick operation tools

❓ Frequently Asked Questions

• What is the difference between RW4 and RW9 fuses?
RW4 is typically used for lower voltage classes (10–15kV), while RW9 is for up to 35kV systems.

• Can I replace the fuse link without de-energizing the line?
No. For safety, the line must be isolated before fuse replacement.

• Is a polymer version available?
Yes. RW4 is available with either porcelain or composite (polymer) insulation, depending on environmental needs.

• Can it be used as a switching device?
No. RW4 is not designed for live switching—only for fault protection and visible isolation.

• Does it comply with IEC or ANSI standards?
The RW4 conforms to IEC 60282-2 and GB 15166.3-2007. ANSI-compatible models are also available upon request.