HRW10F-12 Drop-Out High Voltage Fuse

12kV Outdoor Fuse Cutout for Distribution Line and Transformer Protection

The HRW10F-12 drop-out fuse is a 12kV-rated protective device designed for medium voltage overhead distribution systems. Built for outdoor pole-mount installations, it provides fast and visible circuit isolation in the event of faults such as transformer short-circuits, surge failures, or line overcurrents.

With its drop-out design, linemen can easily identify blown fuses from the ground, reducing downtime and improving grid reliability. The ceramic or polymer insulator structure ensures robust insulation even under harsh outdoor conditions.

🔧 Key Features

Model: HRW10F-12
Rated Voltage: 12kV
Rated Current: 100A / 200A
Breaking Capacity: Up to 12kA
Drop-Out Function: Visible fuse link separation on operation
Housing Options: Porcelain or polymer (UV and aging resistant)
Standards: IEC 60282-2, GB/T 15166.3

⚙️ Technical Specifications

Parameter	Value
System Voltage	12kV
Rated Current	100A / 200A (replaceable link)
Breaking Capacity	8kA–12kA
Power Frequency Withstand	42kV (1 min)
Lightning Impulse Withstand	75kV
Fuse Link Type	T- or K-type, per IEC
Mounting	Horizontal or inclined pole
Installation Height	≤3000m
Ambient Temp	–40°C to +55°C

🏭 Real-World Applications

The HRW10F-12 is widely used in the following scenarios:

✅ Distribution Transformer Inlet Protection

Mounted at the input of 11kV or 12kV transformers to isolate them under overloads or internal faults.

✅ Overhead Line Section Isolation

Acts as a protective point for feeders, reducing the impact of downstream faults and improving restoration time.

✅ Renewable Energy Systems (e.g., PV, wind)

Used on the MV side of inverter transformers or collector circuits to provide primary disconnection protection.

🧱 Product Construction

Drop-Out Arm: High-strength copper alloy with arcing horns
Fuse Holder Tube: Arc-quenching inner liner and weather-resistant shell
Insulator: Optional porcelain or silicone polymer, with anti-contamination creepage
Mounting Brackets: Hot-dip galvanized for rust resistance
Fuse Links: Industry standard compatible, fast replacement

❓ Frequently Asked Questions

• What’s the advantage of drop-out design?
It provides a visible break when operated, allowing easier fault identification and replacement from the ground.

• Can it be used in high-humidity areas?
Yes, the polymer-housed version is suitable for tropical or coastal climates.

• Is this suitable for switch-fuse combination panels?
No, this product is designed for outdoor pole-mount use, not indoor cabinets.

• Are spare fuse links provided?
Yes, optional packs of fuse links can be shipped with each order.

• Can I install this near photovoltaic equipment?
Absolutely. It’s commonly used at the 10kV/11kV level in PV substations or collector systems.