Air vent valve ONp III SA 24/4S 03-041

Air disconnect switch – reliable protection for power lines

The ONp III SA 24/4S air disconnect switch is a device designed for safely disconnecting electrical circuits in overhead lines. The three-pole design with a common frame and drive ensures simultaneous operation of all poles, simplifying operation and increasing safety. It is a key element of energy infrastructure, providing the ability to disconnect a section of the network for maintenance or repair work.

Construction and application

This disconnect switch is characterized by a solid construction adapted for direct mounting on a pole. It is made of steel profiles protected by a galvanized coating using the immersion method, which guarantees long-term operation even in harsh weather conditions. The use of silicone insulators (in the "S" version) provides high resistance to moisture, dirt and UV radiation, which translates into stable electrical parameters and minimizes the risk of failure. The main contacts are made of copper protected against corrosion by tinning, and can optionally be additionally silver-plated to increase conductivity.

• Mounting: Designed for direct mounting on the pole footing.
• Application: Safe disconnection of circuits in overhead lines during maintenance and repair work.
• Construction: Three-pole with a common frame and drive for all poles.
• Insulators: Available versions with porcelain, composite or silicone insulators (version "S").
• Connection cross-section: Current clamps allow connection of a cable or conductor with a cross-section of up to 95 mm², and on request up to 120 mm².

Advantages and design features

This disconnect switch is distinguished not only by its solid workmanship, but also by well-thought-out design solutions that facilitate assembly and operation:

• Pole synchronization: A common drive ensures simultaneous closing and opening of all poles, minimizing the risk of incorrect operation.
• Flexible connections: Copper flexible connections connecting the current clamps to the main contacts ensure an optimal current flow path and reduce energy losses.
• Movable joints: Equipped with movable joints with current clamps to prevent breakage of the cable or power supply cable during operation of the device.
• Control options: Manual control (NRA(u) drive) or motor control (NEA drive) is possible.
• Availability of "o" version: Version "o" adapted for mounting a surge arrester is available.

Choosing the ONp III SA 24/4S disconnect switch is an investment in a reliable and durable solution that will ensure safe and efficient operation of your energy infrastructure. Thanks to its solid construction and well-thought-out technical solutions, this product will meet the expectations of both professional installers and end users.