The ZN85-40.5 series indoor high-voltage vacuum circuit breaker (hereinafter referred to as the circuit breaker) is suitable for three-phase AC 50Hz power systems with a rated voltage of 33kV/40.5kV. It can be used in industrial and mining enterprises, power plants, and substations for switching load currents, overload currents, and fault currents. The circuit breaker and operating mechanism adopt a vertical arrangement structure, effectively reducing the depth of the circuit breaker.
The three-phase arc-extinguishing chambers and associated live parts are isolated by three independent epoxy resin insulation cylinders, forming a composite insulation structure. The circuit breaker meets air gap and creepage distance requirements under normal operating conditions while significantly reducing its overall size. The main conductive circuit components (vacuum arc-extinguishing chambers and moving/stationary conductive connections) are installed within the insulation cylinders, achieving a phase-to-phase spacing of only 300mm. All electrical connections in the main circuit adopt fixed connections, ensuring high reliability. The insulation cylinders are mounted above the circuit breaker frame.
A specially designed spring operating mechanism is installed within the circuit breaker frame. Its structural characteristics are particularly suited to the vertical arrangement of the circuit breaker, forming an integral part of the overall structure. The mechanism features simple design principles, with output curves and performance optimized for the characteristics and requirements of 33kV/40.5kV vacuum circuit breakers.
The overall layout is rational, aesthetically pleasing, and concise. The compact size, flexible operation, reliable electrical performance, long service life, convenient maintenance, and maintenance-free mechanism make it ideal for frequent operations and demanding application scenarios or operating conditions.
| Type | ZN85-40.5 |
| Rated Voltage | 33kV/40.5kV |
| Power Frequency Withstand Voltage(RMS) | 95kV |
| Lightning Impulse Withstand Voltage(Peak) | 185kV |
| Rated Frequency | 50Hz |
| Rated Current | 1250A,1600A,2000A |
| Rated Short-Time Withstand Current | 25kA,31.5kA |
| Rated Peak Withstand Current | 63kA,80kA |
| Rated Short-Circuit Duration | 4s |
| Rated Short-Circuit Breaking Current | 25kA,31.5kA |
| Rated Short-Circuit Making Current | 63kA,80kA |
| Rated Operating Sequence | O-0.3s-CO-180s-CO |
| Breaking Time | ＜80ms |
| Rated Short-Circuit Breaking Current Interrupting Times | 20Times |
| Single Capacitor Bank Breaking Current | 630A |
| Back-to-Back Capacitor Bank Breaking Current | 400A |
| Rated Operating Voltage | AC110,220V；DC110,220V |
| Mechanical Life | 10000Times |
◆ Ambient Air Temperature: Not exceeding 40℃; daily average temperature not exceeding 35℃; minimum ambient air temperature: -15℃;
◆ Relative Humidity: Daily average ≤95%; monthly average ≤90%;
Daily average water vapor pressure ≤2.2kPa; monthly average ≤1.8kPa;
◆ Altitude: Not exceeding 1000m;
◆ No significant contamination from dust, smoke, corrosive or flammable gases, vapors, or salt spray in the surrounding environment;
◆ External vibrations or ground motions affecting the switchgear and control equipment are negligible;
◆ Electromagnetic interference induced in secondary systems shall not exceed 1.6kV in amplitude;
◆ Special Service Conditions: For installations at altitudes exceeding 1000m, ambient air temperatures beyond normal service condition limits, or locations prone to condensation due to high humidity, please consult us for customization.
