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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.

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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

1. Ultra-High Voltage Resistance & Reliability

- Power frequency withstand voltage: 98kV/1min; lightning impulse withstand voltage: 125kV. Insulators feature bending strength ≥1000N, ensuring stable operation in extreme weather.

2. Fast-Acting Protection & Safe Isolation

- F-type (fast-acting) breaking speed; short-circuit interruption time ≤10ms. The fuse tube automatically drops to isolate faults, minimizing power outage scope.

3. Eco-Friendly & Long Lifespan

- Flame-retardant PA66 housing with UV resistance. Silver alloy fuse element (low melting point, high conductivity) ensures a lifespan ≥15 years.

4. Flexible Configuration

- Compatible with RW7, RW11, and RW12 series. Customizable lead-type, plate-type, or horn-shaped fuse bases for diverse installation needs.

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

- Branch Circuit Protection: Installed on 10kV branch lines to isolate faulty sections and reduce outage impact.

- Transformer Protection: Primary defense against overload/short-circuit in distribution transformers, preventing winding damage.

- Outdoor Power Systems: Ideal for wind/solar farm collector lines, resistant to salt spray and sandstorms.

- Industrial Emergency Shutdown: Used in mining/chemical plants for rapid high-voltage equipment cutoff; supports quick fuse tube replacement.

1. Opening Sequence

- Disconnect the middle phase → Leeward phase → Windward phase to avoid interphase arcing.

2. Closing Sequence

- Connect windward phase → Leeward phase → Middle phase. Ensure contacts are tightly engaged (clamping tongue ≥2/3 length).

3. Safety Checks

- After opening, verify full tube drop using an insulated rod. Post-closing, press the duckbill tongue 3 times to test stability.

Q1: How to select the rated current?

A: Choose 1.5× the load current (e.g., 75A fuse for a 50A transformer). Consider motor startup currents.

Q2: Fuse tube drops but circuit remains live?

A: Check for loose/aged fuse elements. Replace with same-spec fuses and clean contacts (alcohol wipe).

Q3: Support above 40.5kV?

A: Yes! Custom 72.5kV models available (withstand 185kV/1min, 450kV lightning impulse).

Q4: Maintenance interval?

A: Inspect contact oxidation every 2 years; clean insulators annually in high-pollution areas.

Q5: Can a blown fuse be reused?

A: Replace fuse elements only! Never reset the fuse tube directly—risk of explosion.

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