Overhead earth disconnect switch RUNMp III SA 24/4Ko 03-084

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

The RUNMp III SA 24/4Ko disconnect-earthing switch is a device designed for the safe disconnection and grounding of circuits in overhead medium voltage distribution networks. Its modular design, combined with the possibility of vertical mounting, makes it a versatile solution for both installers and end-users. The device is manufactured by ALPAR, a renowned manufacturer of electrical equipment.

### Construction and application

The RUNMp III SA 24/4Ko consists of three independent poles mounted on a common structure. Each pole is built on supporting insulators – ensuring stability and safety – and equipped with main and auxiliary (knife) contacts. This construction guarantees simultaneous switching of all poles, simplifying operation and minimizing the risk of errors. The possibility of vertical mounting directly on the pole or on a supporting structure increases installation flexibility. The device is used in 24kV overhead lines, where it serves to disconnect sections of the network for maintenance or repair work, and to safely ground disconnected sections.

### Key features and benefits

* **Modular design:** Allows easy adaptation to different network configurations and simplifies any repairs and component replacements.

* **Vertical mounting:** Allows for optimal use of space on the pole and minimizes the load on the supporting structure.

* **Composite insulators:** Provide high mechanical and electrical strength, as well as resistance to weather conditions. Composite insulators reduce the weight of the device compared to traditional porcelain insulators.

* **Durable materials:** The use of hot-dip galvanized steel guarantees long-term protection against corrosion, even in harsh environmental conditions.

* **Safety of use:** The design ensures effective quenching of the electric arc during circuit disconnection, minimizing the risk of damage and hazards to personnel.

* **Compliance with standards:** The device meets the requirements of PN-EN 62271-103:2011, which confirms its high quality and safety.

* **Continuous rated current 400A:** Allows safe operation in standard operating conditions of medium voltage networks.

* **Withstand short-time rated current 16kA:** Provides resistance to short circuits and overvoltages occurring in the power grid.

* **Rated voltage 24kV:** Adapted to the typical parameters of medium voltage networks.

Thanks to these features, the RUNMp III SA 24/4Ko disconnect-earthing switch is a reliable and effective solution for professionals involved in the construction, modernization and operation of power networks. Its solid construction and compliance with applicable standards guarantee long-term and safe operation of the device.