Air vent ONM III SA 24/4o 03-065

Air disconnector ONM III SA 24/4

This three-pole air disconnector, designated ONM III SA 24/4, is designed for safely disconnecting circuits in medium voltage networks. It is a modular component, allowing for flexible adaptation to various configurations and mounting conditions. The disconnector's design allows for independent adjustment of the poles relative to each other, while maintaining minimum insulation distances.

Construction and application

The ONM III SA 24/4 disconnector is characterized by its modular construction, which facilitates its integration with various electrical systems. It is intended for mounting on spun poles, and its design allows for direct mounting on the pole foot. It is used both as a disconnector (ON) and as a disconnector-earthing switch (OUN), providing comprehensive installation protection. Thanks to the possibility of using different types of insulators – porcelain, composite or silicone – it can be adapted to specific environmental and operational requirements.

Advantages and characteristic features

• Modular construction: Enables flexible adaptation to different configurations and mounting conditions.
• Three-pole design: Ensures reliable disconnection of all phases of the circuit simultaneously.
• Choice of insulators: Availability of porcelain, composite and silicone insulators allows for optimization in terms of environmental conditions and costs.
• Adaptation for pole mounting: The design allows for direct mounting on the foot of a spun pole, simplifying installation.
• Common drive: Enables simultaneous control of all disconnector poles, increasing safety and operational efficiency.
• Wide voltage and current range: The disconnector is adapted to operate in 24 kV networks at a current of 400 A.
• Availability of earthed versions: The possibility of using a disconnector-earthing switch version (OUN) provides additional safety by effectively discharging fault currents to earth.

It is worth remembering that when choosing a modular disconnector intended for mounting on a spun pole, the top diameter of the pole must be specified. The disconnector is operated using a manual NRA(u) or motor NEA drive, which are connected to the drive mechanism using M10 screws.