Overhead earth disconnect switch RUN III SA 24/4 03-004

Air disconnect switch – a reliable protection for medium voltage lines

The RUN III SA 24/4 air disconnect switch is a key element of power infrastructure, designed for the safe disconnection and grounding of medium voltage circuits. The construction of this device, based on solid materials and well-thought-out solutions, guarantees long-term and trouble-free operation in demanding weather conditions. It is an essential device for both professional installers and network operators, ensuring safety and work efficiency.

Construction and application

The RUN III SA 24/4 disconnect switch is a three-pole device integrated with a grounding function. Its construction is based on a common steel frame, hot-dip galvanized to ensure high corrosion resistance. Each pole of the disconnect switch is mounted on two support insulators – one attached to the frame and the other to a bearing movable beam. This solution ensures simultaneous closing and opening of all poles, which simplifies operation and increases safety. The device is adapted for vertical mounting directly on a pole or horizontal mounting on a supporting structure.

The current path of each pole consists of main and auxiliary (arcing) contacts, mounted on support cassettes. The main contacts are made of tinned copper flat bars, which ensures excellent conductivity and protection against corrosion. Flexible joints in the movable contacts minimize the risk of damage to the conductors during switching on and off. Additionally, the use of silicone insulators (in the S version) increases resistance to weather conditions and provides long-lasting insulation.

Advantages and benefits

• High reliability: Solid construction using high-quality materials guarantees long-term and trouble-free operation of the device.

• Safety: The grounding function provides effective protection against electric shock during maintenance and repair work.

• Versatility: The possibility of vertical or horizontal mounting adapts the device to various configurations of power networks.

• Ease of operation: The common drive for all poles simplifies the process of switching on and off the circuit.

• Corrosion resistance: Hot-dip galvanizing of steel elements ensures high resistance to weathering.

• Flexibility of connections: Joints in the movable contacts prevent damage to the working conductors of the line during operation of the disconnect switch.

• Compliance with standards: The device meets the requirements of PN-EN 62271-103:2011 and PN-EN 61140:2005/A1, which confirms its safety and quality.

• Remote control capability: Cooperation with motor drives enables remote control via radio (optional).

The device is intended for operation in overhead medium voltage lines of 15 and 24kV, and its continuous rated current is 400A, while the withstand short-circuit current is 16kA. This disconnect switch is used in disconnection points of medium voltage lines, allowing safe performance of maintenance and repair work in the power grid.