Disconnect switches and earthing switches are important components for electrical isolation, grounding and maintenance safety in distribution systems. They are available in different voltage levels and installation configurations, including indoor disconnect switches, outdoor high voltage AC disconnect switches, high altitude models and low voltage disconnect switches.
The product configuration can be selected according to system voltage, rated current, installation environment and operating requirements. Common applications include switchgear, substations and distribution equipment where clear electrical isolation and grounding are required.
Indoor disconnect switches cover 12kV, 24kV and 40.5kV levels, mainly with a rated current of 630A. Some models integrate an earthing switch, allowing isolation and earthing functions to be completed through a coordinated operating sequence. These products are commonly used in indoor switchgear and distribution equipment where reliable circuit isolation is required during inspection and maintenance.
Outdoor high voltage AC disconnect switches cover 12kV, 15kV and 40.5kV applications, with attention to corrosion resistance, insulation performance and operating flexibility. High voltage disconnect switches can be selected according to the voltage level and installation conditions of the distribution system.
High altitude disconnect switches are adjusted in terms of insulation distance and material selection to accommodate lower air pressure and larger temperature differences. They are suitable for electrical installations located at higher elevations where environmental conditions can affect insulation performance.
Earthing switches provide a grounding connection after a circuit has been isolated, supporting safer maintenance and inspection operations. Indoor 12kV earthing switches are available in 31.5kA and 630A specifications, while 40.5kV indoor earthing switches can withstand a 31.5kA short-circuit current.
Key selection considerations include:
Reliable switching performance depends on both electrical design and mechanical component accuracy. During manufacturing, contact coating thickness, transmission part fit accuracy and operating torque are included in inspection. Contact surfaces are checked to support stable electrical connection, while transmission components are inspected for proper fit and smooth mechanical movement.
Operating torque is also considered during inspection to help ensure consistent switching operation after repeated use. These checks are particularly important for high voltage electrical equipment used in distribution systems.
By controlling these key manufacturing details, disconnect switches and earthing switches can provide stable isolation, grounding and switching functions across different distribution system applications.
