Air vent ON III SA 24/4S 03-009

Air disconnect switch – reliable network protection

The ON III SA 24/4S air disconnect switch is a three-pole device used for safely switching on and off circuits in overhead lines. The construction of this disconnect switch, based on a common base and drive for all poles, ensures synchronization of switching operations, which is crucial for the proper functioning of the network. It is an essential element in both newly built and modernized installations.

Construction and application

The disconnect switch is built on two support insulators per pole – one attached to the base, the other to the bearing movable beam. This construction guarantees simultaneous closing and opening of all poles, minimizing the risk of damage and ensuring safety. This makes the connection and disconnection process smooth and reliable. The device is designed for direct mounting on the power pole, which facilitates installation and maintenance. Made of closed profiles and cold-formed sections, with a zinc coating protecting against corrosion, it guarantees long-term operation even in harsh weather conditions.

Key features and benefits

• Pole synchronization: Common drive ensures simultaneous operation of all poles, increasing the safety and reliability of switching operations.
• Durable construction: The use of closed profiles and cold-formed sections and a zinc coating ensures corrosion resistance and long device life.
• Insulators: Available versions with porcelain, composite or silicone insulators allow you to adapt the disconnect switch to specific working conditions and user preferences. The "S" version indicates the use of silicone insulators – characterized by high resistance to weather conditions and pollution.
• Easy installation: Designed for direct mounting on the pole base, which simplifies the installation process and reduces costs associated with assembly.
• Current clamps: Equipped with current clamps allowing connection of a cable or wire with a cross-section up to 95 mm² (or 120 mm² on request), providing flexibility in the selection of power cables.
• Manual or motor drive: Possibility of control with a manual drive type NRA(u) or motor NEA, adapting the method of operation to the user's needs.
• Connection safety: Main contacts made of copper flat bar protected against corrosion by tinning (optional silver plating) ensure a stable electrical connection.
• Protection against cable damage: The movable joint with the current clamp prevents the cable or power cord from breaking during operation of the disconnect switch.

Thanks to these features, the ON III SA 24/4S disconnect switch is a solid and reliable solution for professionals involved in the construction and maintenance of power networks and for end-users looking for safe and effective protection of their installations.