Commonly used high-voltage disconnect switches include GN19-10 and GN19-10C, with older, similar products including GN6-10 and GN8-10. Taking GN19-10 as an example, it mainly includes the following parts:
Conductive Part: The stationary contact is formed by a copper plate bent at a right angle. One end with a hole can be connected to the busbar via a screw; the other end is shorter and contacts the moving blade (moving contact) when the switch is closed.
Two copper plates form a contact strip, also called the moving contact, which can rotate around an axis at a certain angle. When the switch is closed, it clamps the stationary contact. A clamping spring between the two copper plates adjusts the contact pressure between the stationary and moving contacts. Simultaneously, when current flows through the two copper plates in the same direction, they generate an attractive electromotive force, which increases the contact pressure and improves operational reliability. Galvanized steel sheets called magnetic locks are installed at both ends of the contact bar. These locks, after being magnetized, attract each other when a short-circuit fault current flows through them, strengthening the contact pressure of the contacts and thus improving the dynamic and thermal stability of the disconnecting switch.
Insulation Parts: The moving and stationary contacts are fixed to two sets of supporting porcelain insulators. For models with "C", the moving contact is fixed to the bushing porcelain insulator. To insulate the moving contact from the metallic, grounded transmission parts, a porcelain-insulated pull rod insulator is used.
Transmission Parts:
These include the main shaft, crank arm, and pull rod insulator.
Base Parts: Composed of a steel frame. The supporting porcelain insulators or bushing porcelain insulators and the transmission main shaft are all fixed to the base. The base should be grounded. In summary, the disconnecting switch has a simple structure, no arc-extinguishing device, and a clear disconnection point when in the open position, making its open/closed state very intuitive.