Drop out fuse is the most commonly used short-circuit protection switch for branch lines of distribution lines and distribution transformers. It has the characteristics of economy, easy operation, and strong adaptability to outdoor environments. It is widely used in 11kV distribution lines and the primary side of distribution transformers for protection and equipment switching operations. It is installed on the branch line of a 11kV distribution line, which can reduce the range of power outages. Due to its obvious disconnection point, it has the function of an isolation switch, creating a safe working environment for the maintenance section lines and equipment, and increasing the sense of security of maintenance personnel. Installed on distribution transformers, it can serve as the main protection for distribution transformers, so it has become popular in distribution lines and distribution transformers.
Product Detail
The drop out fuse 11kv (also known as fused cutout switch) is an essential protective device in outdoor high-voltage distribution systems. It delivers:
• Short-circuit and overload protection for transformers and branch lines
• Load current switching, enabling safe maintenance and isolation
• Visible disconnection, as the fuse switches to an open position when blown, signaling a clear fault
Generally, fuse cut-out contains following parts:
(1) Insulator;
(2) Metal parts;
(3) Fuse tube;
(4) Fuse element (link).
Connected with incoming feeder of distribution transformer or distribution lines, high-voltage drop-out fuse cut-out mainly protect transformer or lines form short circuit and overhead, and on/off loading current.
Cut out fuse is composed of insulators and fuse tube/carrier.
Static contacts are fixed on two sides of insulator support while moving contacts are installed on two ends of fuse tube/carrier. Fuse tube/carrier is composed of inner arc-extinguishing tube, outer phenolic compound paper tube or epoxy glass tube.
Pole-mounted distribution transformers in 11 kV networks
Overhead distribution feeders (branch lines)
Rural or utility grid systems where reliable isolation is required
Supports 100 A and 200 A fuse links for different load requirements
High breaking capacity (kA) ensures effective short-circuit interruption
Designed to meet IEC 60282‑2 (or region-specific standards like IS 9385)
High impulse withstand voltage (e.g., up to ~110 kV) for lightning protection
Available with polymeric insulator (silicone / fiberglass composite) for lightweight, UV and pollution resistance
Also offered with porcelain insulator for traditional robustness
All conductive parts use high-quality copper/brass; contact surfaces are silver-plated for reliable conductivity
Mechanical life typically ≥ 10,000 operations in many designs
Visible drop-out of the fuse tube offers safe and instant indication of fault — supports maintenance and fault diagnostics
Large ring-pull design simplifies installation and removal for field technicians
Ensure the fuse tube is properly seated in the jaws and the motion indicator (if any) is correctly mounted.
Maintain recommended installation angle (per spec sheet) for reliable drop action.
Use the correct rated fuse link (100A or 200A) based on coordination studies with downstream devices.
Periodically inspect and replace fuse links and tubes — particularly in polluted or corrosive environments.
11 kv Drop Out Fuse Parameters
| Model | Rated voltage | Rated current | Current interruption | Impulse voltage | Power frequency withstand voltage |
| HRW12-11/100 | 11kV | 100A | 6.3kA | 110kV | 42kV |
| HRW12-11/200 | 11kV | 200A | 8kA | 110kV | 42kV |
Advantages of 11 kV Drop‑Out Fuse
High Reliability: Proven track record in outdoor distribution networks
Safety: Visible dropout for immediate fault indication and safe isolation
Flexibility: Options in insulator material (polymer or porcelain), rated current (100 A / 200 A)
Cost Efficiency: Fuse links and tubes are replaceable; no need to replace whole unit often
Compliance: Built to IEC / IS standard for global and regional projects
Durability: Resistant to UV, pollution, acid / alkali environments (for polymer type)
FAQ
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Can we print our trademark or company name on your product or package?
OEM and ODM orders are warmly welcomed, we have rich successful experience in OEM projects. In addition, our R&D team will provide you with professional suggestions.
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How does your company do in terms of quality control?
1) We choose all raw materials to be of high quality.
2) Professional and skilled workers pay attention to every detail in handling the production process.
3) The quality control department is specialized in quality inspection for each process.
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How can I get samples to test your quality?
We can provide free samples for you to test and check, just bear the freight cost.
Contact us to know more about our products, our professional team will serve you and customize it according to your requirements.
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