40.5kV Indoor Vacuum Circuit Breaker, ZN85

40.5kV indoor vacuum circuit breaker is suitable for three-phase AC 50Hz power systems, applicable to industrial and mining enterprises, power plants and substations for breaking and closing load current, overload current and short-circuit current. The composite insulation structure is adopted to meet the insulation requirements under normal operating conditions, effectively reducing the volume of the circuit breaker.

Environmental Conditions Altitude: lower than 2000 m; Ambient temperature: up to 40°C, greater than -15°C; Relative humidity: daily average ≤ 95%, monthly average ≤ 90%; Earthquake intensity: ≤ magnitude 8; Areas without risks of fire, explosion, pollution, chemical corrosion and severe vibration; Structure features The arc-extinguishing chamber is arranged at upper part while the operating mechanism is at lower part for easy maintenance; Air and organic material composite insulation structure design is featured by compact structure and light weight; Simple spring mechanism ensures 10,000 maintenance-free operating cycles; Technical Parameters

Item	Unit	Parameter
Rated voltage	kV	40.5
Rated current	A	1250	1600	2000, 2500
Rated short-circuit breaking current	kA	25/31.5	25	31.5
Rated dynamic current (peak)	kA	63/80	63	80
Thermal current(4s)	kA	25/31.5	25	31.5
Rated short-circuit making current(peak)	kA	63/80	63	80
Rated operating sequence		〇—0.3s—CO— 180s—00
Power frequency withstand voltage(1min)	kV	95
Rated lightning impulse withstand voltage(peak)		185
Mechanical endurance	Times	10000