RW11-12KV/200A Drop-out Fuse Outdoor High-Voltage Protection Device

Product Overview

The RW11-12 drop-out fuse is a critical outdoor high-voltage protection device in power transmission and distribution systems, widely used on the high-voltage side of distribution transformers or on branch trunk lines. This high-voltage ceramic drop-out fuse is mainly used for short-circuit and overload protection of transformers and lines, and can reliably make and break load currents. Its structure mainly consists of a ceramic insulating support and a fuse tube. The fixed contacts are installed at both ends of the insulating support, while the moving contacts are installed at both ends of the fuse tube. The fuse tube is ingeniously designed, composed of an inner arc-extinguishing tube and an outer phenolic paper tube or epoxy fiberglass tube, ensuring reliable arc-extinguishing performance. For scenarios requiring load-break operations, the load-break drop-out fuse is specially enhanced with resilient auxiliary contacts and an arc chute to safely make and break load currents.

The RW series 12kV drop-out fuses produced and sold by FAURE/Gaosuo Electric are held in the closed position by the tension of the fuse element during normal operation. When a fault occurs in the system, the fault current causes the fuse element to melt rapidly, creating an arc. At this time, the arc-extinguishing tube, subjected to the heat of the arc, decomposes a large amount of gas, creating high pressure inside the tube, which is blown longitudinally, rapidly elongating and extinguishing the arc. After the fuse element melts, the lower moving contact loses tension and flips downward, triggering the locking mechanism to release the fuse tube, which then drops automatically, forming a clear and safe disconnection isolation position. When it is necessary to break the load, an operator can use an insulating pole to pull the moving contact. At this point, the main moving and fixed contacts are still in contact. As the insulating pole continues to pull the contact, the auxiliary contacts also separate, creating an arc between them. This arc is elongated in the narrow slot of the arc chute, and the arc chute generates gas, extinguishing the arc at current zero.

Product Features

• After installing a high-voltage fuse element in the drop-out fuse, it effectively protects the circuit and interrupts fault currents, serving as an important protection barrier in the power system.
• Uses high-voltage ceramic material as the insulator, providing excellent insulation performance and strong weather resistance, ensuring stability for long-term outdoor operation.
• After the fuse element melts, the fuse tube drops automatically, forming a clear isolation distance, offering high safety and facilitating fault identification and maintenance.

Installation Position Diagram

Main Technical Parameters

The main technical parameters of the RW11-12KV/200A drop-out fuse are listed in the table below, covering key indicators such as rated voltage, rated current, breaking capacity, and insulation performance.

Appearance Dimensions