Overhead earth-disconnecting switch RUNMp III SA 24/4So 03-088

Air disconnect-earthing switch – a reliable protection for medium voltage networks

The RUNMp III SA 24/4 disconnect-earthing switch is a key element of power infrastructure, designed for the safe disconnection and grounding of medium voltage circuits. This device, manufactured by ALPAR, combines the functions of a disconnector and an earthing switch, providing comprehensive protection of the installation and safety during maintenance work. The modular design and the possibility of vertical mounting on a pole make it a versatile solution for both new and modernized networks.

### Construction and application

The RUNMp III SA 24/4 is characterized by a three-pole design with a common support beam and a drive for all poles. This construction guarantees simultaneous closing and opening of all poles, which is crucial for maintaining the integrity of the system during switching operations. The device is adapted for direct mounting on the pole base, which simplifies the installation process and minimizes the need for additional mounting elements. The modular design allows for flexible positioning of the poles in relation to each other, adapting to specific mounting conditions.

The current path of each pole consists of main contacts and auxiliary (arcing) contacts, ensuring reliable current conduction and rapid extinguishing of the electric arc during disconnection. Thanks to the use of porcelain (or optionally composite or silicone) insulators, the device provides high electrical insulation and resistance to atmospheric conditions. The possibility of using composite or silicone insulators increases resistance to pollution and corrosion, which extends the life of the device and reduces operating costs.

### Advantages and benefits

* **Safety:** Combining the functions of a disconnector and an earthing switch provides comprehensive protection of the installation and safety of personnel during maintenance work.

• Reliability: Solid construction and high-quality materials guarantee long-term and trouble-free operation of the device.

• Versatility: The possibility of vertical mounting on a pole and the modular design allow adaptation to different installation conditions.

• Simple installation: Adaptation for direct mounting on the pole base simplifies the installation process and reduces labor costs.

• Flexibility: The possibility of choosing porcelain, composite or silicone insulators allows for optimization of the device to specific environmental conditions.

• Pole synchronization: The common drive ensures simultaneous closing and opening of all poles, minimizing the risk of damage to the installation during switching operations.

• Spare parts availability: The manufacturer ALPAR ensures the availability of spare parts, which facilitates servicing the device in case of failure.

This device finds wide application in SN transformer stations, overhead medium voltage lines and in branch points of power networks. It is an ideal solution for both professional installers and energy companies looking for a reliable and safe solution to protect their networks.