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Drop-out Fuse

The outdoor drop-out fuse is specifically designed for 10kV power distribution systems, providing overload and short-circuit protection while functioning as an isolation switch with visible breaking points to ensure maintenance safety. It covers rated voltages from 3.6kV to 40.5kV and rated currents from 1A to 100A, suitable for 50Hz AC power lines and distribution transformer protection. Compliant with European standards and GB/T 15166, the product uses eco-friendly materials (PCB-free), withstands lightning impulse voltages up to 125kV, and operates reliably in harsh outdoor environments (wind speed ≤35m/s, seismic resistance up to level 7). It is widely used in branch power lines, substations, and industrial power systems.

Outdoor Use: Suitable for high voltage distribution systems.
High Breaking Capacity: Ensures safety by interrupting high fault currents.
Robust Construction: Built to withstand harsh environmental conditions.

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Outdoor drop-out fuse High-voltage fuse Fast-acting fuse RW11 fuse Distribution line protection

Product Advantages

Technical Parameters

Applications

Operation Guide

FAQ

Product Advantages

1. Ultra-High Voltage Resistance & Reliability

Power Frequency Withstand Voltage: 98kV for 1 minute, ensuring exceptional durability under high-voltage conditions.
Lightning Impulse Withstand Voltage: 125kV, capable of enduring severe lightning strikes.
Bending Strength: ≥1000N, providing reliable performance even in extreme weather conditions such as heavy storms or high winds.
Durability: Built for long-term stability, these insulators can withstand high mechanical stresses and environmental factors.

2. Fast-Acting Protection & Safe Isolation

Breaking Speed: F-type fuse provides fast interruption, ensuring quick fault isolation.
Short-Circuit Interruption Time: ≤10ms, minimizing potential damage and enhancing system safety.
Automatic Fault Isolation: Fuse tube drops automatically upon fault detection, reducing the risk of further damage and minimizing the scope of power outages.
Enhanced Safety: Fast response time minimizes risks to both the equipment and personnel.

3. Eco-Friendly & Long Lifespan

Housing Material: Flame-retardant PA66 with UV resistance ensures high performance in harsh environments.
Fuse Element: Silver alloy, featuring low melting point and high conductivity, offering superior reliability.
Lifespan: Fuse elements designed to last for ≥15 years, ensuring cost-efficiency and reducing maintenance needs over time.
Sustainability: Environmentally conscious design for long-term use with minimal environmental impact.

4. Flexible Configuration

Compatibility: Works seamlessly with RW7, RW11, and RW12 series, offering wide application flexibility.
Customizable Fuse Bases: Choose from lead-type, plate-type, or horn-shaped configurations to suit various installation needs.
Versatile Installation: Adaptable to a variety of environments, from industrial applications to renewable energy systems, providing flexibility in installation.
Ease of Use: Simple configuration and quick installation process reduce downtime and enhance efficiency.

Drop-out Fuse

Parameter

Value

Rated Current (In)

1A-100A (customizable)

Power Frequency Withstand

25kV-100kV (1min)

Rated Voltage (Un)

3.6kV

7.2kV

12kV

24kV

40.5kV

Lightning Impulse Withstand

40kV-185kV

Breaking Speed

F-type (fast-acting)

Protection Rating

IP65 (dust/waterproof)

Compliance Standards

IEC 60282-1

GB/T 15166

Applications

1. Branch Circuit Protection

Installation: Mounted on 10kV branch lines to detect faults early and isolate damaged sections, ensuring minimal disruption to the rest of the system.
Reduced Outage Impact: Quickly isolates faults, reducing the overall duration of power outages and enhancing system reliability.
Efficiency: Fast-acting mechanism ensures that only the affected section is isolated, preserving power to other connected circuits.

2. Transformer Protection

Overload & Short-Circuit Defense: Acts as the first line of defense in preventing damage to transformer windings caused by overloads or short circuits.
Enhanced Safety: Automatically isolates transformers under fault conditions, protecting vital components from long-term damage.
Cost Efficiency: By preventing transformer damage, it reduces repair costs and downtime, ensuring continuous operation.

3. Outdoor Power Systems

Ideal for Renewable Energy: Perfect for protecting wind and solar farm collector lines, offering superior reliability in outdoor, harsh environments.
Environmental Resistance: Engineered to withstand challenging outdoor conditions such as salt spray and sandstorms, ensuring long-lasting performance in coastal and desert regions.
Rugged Design: Built with robust materials, making it suitable for extreme weather conditions, ensuring continued functionality in diverse climates.

4. Industrial Emergency Shutdown

Rapid High-Voltage Cutoff: Used in mining and chemical plants to quickly cut off power in the event of an emergency, enhancing safety.
Quick Fuse Tube Replacement: Designed for quick and easy fuse tube replacement, minimizing downtime during critical situations.
Enhanced Industrial Safety: Protects high-voltage equipment from potential damage, reducing risks and supporting operational continuity.

Operation Guide

1. Opening Sequence

Phase Disconnect Order: Start by disconnecting the middle phase, followed by the leeward phase, and finally the windward phase to minimize the risk of interphase arcing.
Prevention of Interphase Arcing: Ensures that arcing does not occur between phases during the opening process, improving operational safety and equipment longevity.
System Protection: The order is designed to safely and effectively isolate each phase without causing damage to the system.

2. Closing Sequence

Phase Connection Order: Begin with the windward phase, followed by the leeward phase, and lastly, connect the middle phase to ensure a proper and stable reconnection sequence.
Contact Engagement: Ensure that the contacts are securely engaged, with the clamping tongue extending at least 2/3 of the contact length for reliable operation and secure closure.
Smooth Operation: Guarantees a consistent and safe reconnection, reducing the risk of faults or damage due to improper contact.

3. Safety Checks

Post-Opening Check: After opening, use an insulated rod to confirm that the fuse tube has fully dropped and that all connections are completely isolated.
Post-Closing Test: After closing, press the duckbill tongue three times to ensure the stability and reliability of the contact, confirming a secure and proper connection.
Safety Assurance: These checks help ensure that the system is both safe and operational, reducing the risk of malfunction or failure.