FN71-12DR type AC high voltage load switch

Type AC high-voltage load switch - main uses and scope of application
Model and meaning
Two normal working environment conditions
The surrounding air is not higher than ℃ and not lower than ℃.
The altitude is not higher than 1 meter.
The daily average relative humidity is not greater than that, and the monthly average is not greater than that.
The surrounding air should not be significantly contaminated by corrosive or flammable gases and water vapor.
No frequent violent vibrations.
Three main specifications and technical parameters
The main specifications are detailed in the table.
See the table for details of rated parameters.
See the table for detailed fuse rating parameters.
Four Structure Overview
The load switch is composed of base insulator, dynamic and static contacts, arc contacts, arc contacts and arc extinguishing chamber, transmission mechanism and spring energy storage mechanism, fuse and operating mechanism, etc. It can be combined with the grounding switch One piece with interlocking device.
Five functions
When the closing operation is manual closing, the operating mechanism stores energy in the closing spring through the transmission mechanism. When the energy storage is terminated, the spring releases energy to achieve high-speed closing of the contact knife.
Opening Operation and Arc Extinguishing Principle When manually opening the gate, the opening spring releases energy, causing the main contact knife to disconnect first, and then
the arc contacts the knife to break the circuit instantly.
At the moment when the arc contact knife is disconnected, an arc is generated. The wall of the arc extinguishing chamber plays a role in cooling the arc, and generates gas under the action of the arc to extinguish the arc.
The load switch equipped with a current-limiting fuse with an impactor has an automatic tripping device. When the fuse is not blown in all phases, the load switch will automatically open and must be re-opened before it can be re-closed.
The load switch equipped with a grounding switch is interlocked through an interlocking mechanism to avoid mis-opening and mis-closing.
When the fuse and the integral load switch are not properly matched, the split load switch can be used first.
The load switch with automatic tripping device can be equipped with an electric opening device to realize electric opening.