Overhead earth disconnect switch RUNM III SA 24/4Ko 03-072

Aerial disconnect-ground switch – a reliable protection for power lines

The RUNM III SA 24/4Ko aerial disconnect-ground switch is a device designed for the safe connection and disconnection of electrical circuits in overhead lines. The design allows for effective isolation of a section of the network, enabling maintenance or repair work without the need to disconnect the entire line. This is a key solution for both installers and end-users, ensuring continuity of supply and work safety.

Construction and application

RUN/RNo type devices are characterized by a high switching current of up to 100A, allowing switching operations without the need to disconnect the entire line. They are equipped with current clamps allowing the connection of aluminum conductors with a cross-section from 16 to 150 mm², and in special versions even up to 185 mm². Variants with an earthing switch have a flexible contact that compensates for conductor movements, minimizing the risk of damage. The possibility of equipping with current transformers and combined sensors expands the functionality of the device, allowing the detection of short circuits and the direction of current flow.

Advantages and benefits

• Safe insulating break: Visible insulating break ensures a high level of safety when working with the device.

• High switching current: 100A allows switching operations without the need to disconnect the entire circuit – saving time and minimizing downtime.

• Flexible grounding contact: Provides reliable grounding and compensates for conductor movements, protecting against mechanical damage.

• Expandability: Option to mount current transformers and combined sensors increases the functionality of the device, enabling network status monitoring.

• Compliance with standards: Meets the requirements of PN-EN 62271-103, PN-EN 62271-1, PN-EN 62271-102 and PN-EN ISO 1461 standards, guaranteeing safety and reliability.

• Universal mounting: Suitable for manual and remote control using NSP-7/SO-2 and NSP-8/SO2 series drives.

Construction and mounting

The RUNM III SA 24/4Ko disconnect-ground switch is available in various design versions (modular, with a support insulator or a surge arrester structure). The rated voltage is 24 kV, and the device is three-pole (III). For correct mounting, it is necessary to select the appropriate mounting structure – detailed information can be found in the manufacturer's technical documentation. It is worth paying attention to the possibility of mounting in a horizontal (H) or vertical (V) version, as well as with the installation of surge arresters.