Overhead earth-disconnecting terminal RUNMp III SA 24/4o 03-080

Air disconnect-grounding switch – a reliable network protection

The RUNMp III SA 24/4o disconnect-grounding switch is a key element of power infrastructure, designed for the safe disconnection and grounding of overhead lines. This device, manufactured by ALPAR, combines the functions of a disconnector and a grounding 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 various applications in medium voltage networks.

Construction and application

The RUNMp III SA 24/4o is characterized by a common base and a single drive for all three poles, which simplifies operation and synchronizes switching operations. Each pole is based on two insulators – a supporting one attached to the base and a bearing movable beam. This construction ensures stability and smooth operation. The current path of each pole consists of main and auxiliary (mig) contacts, mounted on supporting cassettes directly on the insulators.

The device is primarily used in:

• Disconnecting circuits during maintenance and repair work.
• Safely grounding overhead lines before starting work.
• Protecting the installation against overloads and short circuits.
• Construction of new medium voltage lines.
• Modernization of existing power networks.

Key features and benefits

• Modular design: Allows flexible adaptation to specific mounting conditions and network configurations.
• Common drive: Synchronizes switching operations of all poles, increasing safety and work efficiency.
• Vertical mounting: Designed for mounting on poles, saving space and easy integration with existing infrastructure.
• Durable construction: The use of high-quality materials guarantees long-lasting and reliable operation in harsh weather conditions.
• Porcelain insulation: Standardly equipped with porcelain insulators, providing high dielectric strength. Versions with composite or silicone insulation are also available (on request).
• Compliance with standards: The device meets the requirements of applicable safety standards, confirming its reliability and safety of use.
• Simple service: The construction allows easy access to elements requiring maintenance or replacement, minimizing downtime in network operation.

The device is characterized by a rated voltage of 24 kV and a rated current of 400 A, and its type is a modular vertical air disconnect-grounding switch. The device is adapted to work in a wide range of ambient temperatures (-40°C to +40°C) and air humidity (up to 100%). Installation is possible at altitudes up to 1000 m above sea level. Thanks to this, RUNMp III SA 24/4o is a solid and reliable solution for demanding applications in power networks.