Air vent valve ONM III SA 24/4So 03-073

Air disconnect switch ONM III SA 24/4So – a reliable solution for medium voltage networks

The ONM III SA 24/4So air disconnect switch is a device used to safely disconnect electrical circuits in medium voltage networks. It is a three-pole device designed to operate in harsh atmospheric conditions and provide effective insulation. The modular design allows for flexible adaptation to specific installation needs.

### Construction and application

This model, designated as ONM III SA 24/4So, is characterized by the use of silicone insulators (_S_), which increases its resistance to contamination and environmental conditions. This is particularly important in areas with high humidity or exposed to sea salt. The disconnect switch is designed for modular mounting, which facilitates its integration with existing infrastructure. It can be used as a disconnect switch or a disconnect-grounding switch, providing additional safety in the event of a failure.

• Modular construction: Allows for flexible positioning of the poles relative to each other, adapting to the specifics of the installation.
• Silicone insulators: Provide high resistance to atmospheric conditions and contamination, minimizing the risk of insulation breakdown.
• Three-pole construction: Provides comprehensive protection of the electrical circuit.
• Possibility of use as a disconnect switch or disconnect-grounding switch: Expands the functionality of the device and increases installation safety.
• Designed for modular mounting: Facilitates integration with existing network infrastructure.

### Characteristics and benefits

Air disconnect switches of the ONM III SA series are characterized by a solid construction and high reliability. The use of high-quality materials and precise workmanship guarantee long-term and trouble-free operation of the device. This allows installers to be confident that they are offering their customers a safe and effective solution. The use of silicone insulators (_So_) translates into lower maintenance costs and a longer service life, which is important for both network operators and end users. In addition, the modular construction facilitates assembly and disassembly of the device, reducing downtime during service or modernization work.

The device is designed to operate at a rated voltage of 24 kV and a rated current of 400 A. It uses silicone insulators in its modular construction.

It is important to provide the top diameter of the spun pole when mounting the modular disconnect switch intended for mounting to the pole leg. This will ensure proper seating and structural stability.