Air vent ON III SA 24/4 03-001

Air disconnector – reliable power grid protection

The ON III SA 24/4 air disconnector is a key element of energy infrastructure, designed for the safe switching on and off of transmission lines with voltages of 15, 20 and 30 kV. The device, manufactured by ALPAR, is widely used in transmission networks, as well as in branch lines supplying transformer stations. The three-pole design with a common frame and drive ensures synchronization of operations on all poles, which translates into efficiency and safety of operation.

Construction and application

The disconnector is built on a common frame, allowing for horizontal or vertical mounting. Each pole consists of two supporting insulators – fixed and movable – on which current paths are installed. This construction allows for simultaneous closing and opening of all poles, simplifying the operation process and minimizing the risk of errors. The possibility of using porcelain, composite or silicone insulators allows the disconnector to be adapted to specific environmental conditions and installation requirements. The version with grounding (OUN) additionally protects the disconnected line by grounding it.

Advantages and benefits

• Versatility: The possibility of horizontal and vertical mounting makes the disconnector compatible with various power grid configurations.
• Synchronization: A common drive for all poles ensures simultaneous operations, increasing safety and efficiency.
• Durability: Made of closed profiles and cold-formed sections and a zinc coating, it provides corrosion resistance and long-term reliability.
• Flexibility: The ability to choose insulators (porcelain, composite or silicone) allows you to adapt the device to specific working conditions.
• Safety: The version with grounding (OUN) provides additional protection for the disconnected line against accidental re-engagement.
• Easy installation: The design adapted for direct mounting on the pole leg simplifies the installation process.
• Use of different conductor cross-sections: The movable joint with a current clamp allows connection of a cable or conductor with a cross-section of up to 95 mm² (optionally 120 mm²), ensuring compatibility with various types of installations.

The ON III SA 24/4 disconnector is a solid and reliable solution for professionals involved in the construction and maintenance of power grids, as well as for end customers looking for safe and effective protection of their installations.