5A~200A Drop Out Fuse Cutout High Voltage 24KV 100A Critical Protection Device

The RW12 Series Outdoor Drop-Out Fuse Cutout is a critical protection device for medium-voltage overhead distribution systems. Engineered to protect distribution transformers and feeder lines from overloads and short-circuit faults, this fuse cutout provides a visible air-gap isolation point, which is essential for line maintenance and safety.

When a fault occurs, the fuse link melts and the fuse tube drops down under its own weight, providing an immediate visual indication of a tripped circuit. Designed to withstand extreme outdoor conditions—including high UV exposure, salt spray, and heavy ice—the RW12 is the primary choice for rural and urban utility grids worldwide.

• Superior Arc Quenching: The fuse tube is constructed from an epoxy fiberglass filament-wound outer shell with a vulcanized fiber inner liner. This combination generates de-ionizing gases during a fault, rapidly extinguishing the arc.

• Corrosion-Resistant Hardware: All conductive parts are made from high-purity electrolytic copper or brass with heavy silver plating to ensure low contact resistance and prevent oxidation.

• Rugged Insulator Design: Available in High-Strength Porcelain or Silicone Rubber (Composite). The bird-proof design and long leakage paths (creepage distance) prevent flashovers in polluted or humid environments.

• Stable Drop-Out Mechanism: The toggle-joint mechanism is spring-loaded to ensure a smooth, reliable drop-out action even after years of being in the "closed" position.

• Universal Mounting: Features a heavy-duty NEMA Type B mounting bracket, making it compatible with standard crossarms and pole-top configurations.

1. Transformer Protection: Acting as the primary high-side protection for overhead pole-mounted distribution transformers.

2. Feeder Branch Protection: Isolating lateral branches from the main distribution line to prevent localized faults from causing widespread blackouts.

3. Capacitor Bank Protection: Providing reliable overcurrent protection for overhead power factor correction equipment.

4. Sectionalizing Points: Creating a manual disconnect point for line crews to perform safe maintenance on downstream sections.

• Load-Break Capability: Optional load-break "hooks" are available, allowing the use of a portable load-break tool (like a Loadbuster) to disconnect the circuit under load safely.

• Bird-Proof Architecture: The structural design minimizes the risk of phase-to-ground shorts caused by wildlife, a common cause of nuisance tripping in rural areas.

• Tested Reliability: Every batch undergoes mechanical operation tests, contact resistance checks, and dielectric withstand tests to ensure field performance exceeds IEC standards.

• Easy Re-fusing: The fuse holder is designed for quick, tool-free fuse link replacement, minimizing the "time-to-restore" for utility field crews.

Q: Should I choose Porcelain or Silicone Polymer insulators?

A: Porcelain is the traditional choice for long-term stability and UV resistance. Silicone Polymer (Composite) is lighter, shatterproof, and performs better in highly polluted or coastal areas due to its hydrophobic properties.

Q: What fuse links are compatible with this cutout?

A: The RW12 series is compatible with standard Type K and Type T universal button-head fuse links.

Q: Can this unit be used for 33kV systems?

A: This specific model is rated up to 24kV. For 33kV/36kV systems, please refer to our RW11 series, which features a longer insulator body and higher BIL ratings.