1. Ambient temperature: -40 C ~ +50 C.

2. Daily average ambient air relative humidity ≤ 95%, on average ≤ 90%;

3. Wind pressure: less than 700pa.

4. Altitude: less than 3000m.

5. Earthquake intensity: not more than 9 degrees.

6. Air Contamination: Ⅲ grade.

LW Series self-interrupter chamber of sulfur hexafluoride circuit breaker uses advanced self-interrupter principle, when the fault current, the arc own energy use within the pressure cylinder gas pressure increases, when the current zero crossing of the formation of a strong bidirectional blowing gas to the upstream region of the discharge port to extinguish the arc, the circuit breaker breaking successful, thus reducing operating power mechanism.

Way of the current flowing through the system :

Static contact with a wiring board seat → Static finger →Main contacts→ Pressure cylinder → Moving finger → With moving contacts seat wiring board. (Closing position) Opening operation: When the circuit breaker closed, issue of gate signal shunt opening release releases, opening spring through the shaft and crank arm, thereby pulling the insulation and the overall pressure cylinder rod assembly downward, when the static finger and main contacts separate and static and dynamic arc contact arcing contact is no separation, current is still moving along a stationary arcing contact arcing contacts and mobility. When the dynamic and static arc arcing when the contacts separate, the energy produced by arc burning the gas pressure inside the cylinder pressure increases, the nozzle throat from stationary arcing contacts and current zero after pressure from the high pressure gas cylinders nozzle throat and larynx bidirectional moving arcing contact spray, extinguishing the arc.

Closing operation: When the circuit breaker is in the open state, issued a closing signal closing release tripping spring actuator shaft and the crank arm, so as to promote the entire voltage insulated rod and cylinder assembly upward movement to close brake status, while giving opening spring energy storage, the motor starts to make the closing spring, ready for the next opening operation or reclosing operation.

Sealing system uses dynamic sealing and static sealing in two forms. Single dual static seal with O-ring seals for the use of rotating seals and use "X"-ring, during exercise reduces wear and leakage probability.