RW10F-12 12kV Drop-Out Fuse | Outdoor HV Line Protection

The RW10F-12 drop-out fuse is a 12kV outdoor high-voltage protection device widely used in overhead distribution networks for transformer protection, line sectioning, and short-circuit fault isolation. Its reliable drop-out mechanism provides visible circuit disconnection when a fuse blows.

🔧 Product Overview

RW10F-12 consists of a porcelain insulator body and a fuse link holder that drops open when the fuse melts due to overcurrent or short-circuit. This model is manually reset and supports fuse link ratings up to 100A. It’s designed for pole-mount installations in both urban and rural medium-voltage systems.

Highlights:

Rated for 12kV, 50/60Hz, outdoor applications
Available in current ratings: 2A–100A
High-speed interruption with visible fuse drop-out
Low maintenance, suitable for harsh environments
Compatible with DIN/IEC standard fuse links

📐 Technical Specifications

Parameter	Value
Rated Voltage	12 kV
Rated Frequency	50/60 Hz
Rated Current	100 A max
Breaking Capacity	8 kA
Power Frequency Withstand (1 min)	42 kV
Lightning Impulse Withstand	75 kV
Insulator Material	Glazed porcelain
Installation Type	Pole-mounted
Operating Mode	Manual replacement
Standard Compliance	IEC 60282-2

🌍 Application Scenarios

Rural and urban distribution pole transformers
Medium-voltage 12kV feeders and lateral lines
Substation auxiliary circuit protection
Agricultural or industrial distribution nodes
Line protection for capacitor banks or small substations

📊 Case Study: Rural Electrification in Brazil (2021)

In 2021, over 3,000 RW10F-12 fuses were deployed in northeast Brazil's rural power program to protect pole-mounted distribution transformers.
Impact:

Reduced unplanned outages by 43%
Enabled faster fuse link replacement and visible fault detection
Withstood extreme humidity and lightning-prone conditions

Source: Eletrobras Rural Distribution Project, 2021

🛠 Installation Tips

Mount securely to a utility pole using U-bolts or brackets;
Connect the line and transformer side conductors via terminal lugs.
Insert the fuse link and close the holder with the hookstick.
After the operation (fuse blown), inspect and replace the link manually.
Ensure grounding and clearance per local standards.

❓ Frequently Asked Questions (FAQ)

1. What is the main difference between RW10 and RW10F?
RW10F is the improved version with a higher insulation level and mechanical stability.

2. Can the fuse be reclosed automatically?
No. RW10F requires manual replacement of the fuse link after operation.

3. Is porcelain better than polymer for fuses?
Porcelain offers better long-term performance in UV and high-temperature areas; polymer is lighter but less rigid.

4. What kind of fuse links can be used?
Standard DIN-type or IEC-compliant HV fuse links ranging from 2A to 100A.

5. Can this be used with surge arresters or disconnect switches?
Yes. Often paired with arresters and isolators in complete pole-mounted protection setups.