As one of the core electrical equipment, disconnectors perform the key functions of power isolation, maintenance safety protection and circuit switching. This article analyzes the classification logic of disconnectors to facilitate accurate understanding of their technical properties and application scenarios.
Classification by Installation Location
● Indoor Disconnectors: Suitable for enclosed spaces such as substations and distribution rooms. Designed for compactness and insulation performance, they resist indoor humidity and dust effectively.
● Outdoor Disconnectors: Developed for open-air environments, featuring wind resistance, rain/snow protection and corrosion resistance. Widely used in transmission lines, with insulation structures certified by strict environmental tests.
Classification by Knife-Switch Movement Mode
● Horizontal Rotary Type: Contacts are separated via horizontal rotation. Simple in structure, applicable to conventional power distribution systems.
● Vertical Rotary Type: Contacts disconnect through vertical rotation, with large fracture clearance and excellent insulation, commonly used in high-voltage systems.
● Plug-in Type: Moving contacts connect with static contacts in linear motion, featuring fast operation and stable contact, widely applied in compact switchgears.
Classification by Operation Characteristics
Single-Pole Type: Operates single-phase circuits independently, with high flexibility for special wiring requirements.
Three-Pole Type: Controls three-phase circuits synchronously to ensure system balance, the preferred standard configuration.
Type with Earthing Blade: Integrated with earthing function. The earthing contacts close automatically after the main circuit disconnects, providing double safety for maintenance personnel.
Classification by Extended Application Scenarios
V-Type Disconnectors: Adopt V-shaped structure for compact layout, suitable for high-density equipment such as GIS (Gas-Insulated Switchgear).
Double-Column Horizontal Telescopic Disconnectors: Combine horizontal motion and telescopic design to enhance operation stability, adapting to frequent switching operations.
Intelligent Disconnectors: Integrated with sensors and remote control modules, supporting condition monitoring and automated operation and maintenance, to support the construction of smart grids.
In summary, disconnectors have diversified classification dimensions, and practical products usually combine multiple classification attributes. For instance, outdoor double-column horizontal rotary disconnectors are the standard configuration for high-voltage substations. Type selection shall be determined comprehensively by voltage level, installation space, mechanical and insulation requirements, earthing demand and automation level. For further information or procurement inquiries, please contact us and leave your messages or questions.
Post time: Jan-31-2026
