JN4-12/31.5 and JN4-12G indoor high-voltage grounding switches are a new type of grounding switch designed and developed with domestic standards. The structural form is assembled, and its performance meets the requirements of GB1985-89 "AC High Voltage Disconnectors and Grounding Switches" and IEC129. It is suitable for indoor 3-12KV three-phase AC 50Hz power systems. It has a certain closing ability to protect other electrical equipment inside the switchgear from damage. Can be used in conjunction with various high-voltage switchgear as grounding protection for high-voltage electrical equipment maintenance.
JN4-12G indoor high-voltage grounding switch is the main component used for 12KV indoor AC metal armored movable metal enclosed switchgear and other high-voltage switchgear, and can also be used separately. Used for grounding protection in AC 50Hz power systems of 12kV and below. Capable of closing short-circuit current. Reasonable structure, small size, and flexible operation. Easy to install and adjust.

2、 Environmental conditions for the use of JN4-12 indoor high-voltage grounding switch
Altitude: not exceeding 1000-3000m
Surrounding air temperature: upper limit+40 ℃; Lower limit -25 ℃
Seismic intensity: not exceeding 8 degrees
There is no danger of fire, explosion, severe dust, chemical corrosion, or severe vibration in the area.

3、 Main technical data
Rated voltage 12KV
Thermal stability current 31.5 KA
Thermal stability current time S 4
Short circuit closing current 65/80 KA
Dynamic stable current 80 KA
Rated insulation level, power frequency withstand voltage, KV pole to ground and pole to pole 42
Lightning impulse withstand voltage 75