AC disconnect switches are high-voltage switching devices designed to create a visible break in an electrical circuit and to safely isolate equipment during maintenance or emergency work. They are not intended to interrupt high load currents, but they provide mechanical disconnection of lines, busbar sections, transformers, and other equipment.

AC disconnect switches are installed in substations, distribution facilities, on electrified railway lines, in industrial power hubs, and at outdoor high-voltage sites.

Purpose of AC Disconnect Switches

To create a visible break for safe equipment maintenance.

Sectioning of power lines and busbars.

Isolation of transformers, circuit breakers, compensators, and filters.

Operation in grounding circuits (combined disconnectors with grounding switches).

Use in 15/25 kV AC railway networks.

Ensuring personnel safety during repairs and switching operations.

📏 Minimum and maximum technical specifications (general ranges)

Voltage class

12–15 kV (GW4, GW9 series) — confirmed by images of the GW4–15 kV

25 kV (railway AC disconnectors) — confirmed by Hughes Power Systems

72.5–126–145 kV — confirmed by GE Vernova S2DA 550 kV (range includes lower classes)

252–363–420–550–800 kV — verified by Taikai GW6A-252 and GW23B 126–800 kV

Rated current

630–2000 A — verified by R&S and Fritz Driescher (railway and medium-voltage)

3,150–4,000 A — confirmed by R&S (railway knife-type disconnectors)

Up to 5,000 A — confirmed by GE Vernova for high-voltage AC disconnectors

Design types

Horizontal (center-break, double-break).

Vertical (vertical-break).

Rotary type.

Knife-type (railway).

With earthing switch (combined disconnector + earthing switch).

Single-pole and three-pole.

For outdoor and indoor installation.

Design Features

Porcelain or polymer insulators.

Mechanical or motorized drive.

Resistance to vibration, contamination, and icing.

Remote control capability.

What We Can Supply and Provide

We supply AC disconnectors of any brand—we select solutions tailored to specific technical requirements.

We design switching nodes, including busbar sectioning, grounding, and integration with circuit breakers and transformers.

We perform installation, configuration, commissioning, and maintenance.

We provide a warranty covering all stages—from equipment selection to commissioning.

Warranties and Liability

We ensure that the equipment complies with international standards, monitor the quality of deliveries, and guarantee the stable operation of AC disconnectors within the power system. Each stage is backed by an official warranty and technical support.