Main Features:
Functional design: The ZN85-40.5 high voltage vacuum circuit breaker is designed to house and operate voltage transformers, which provide precise voltage signals for power systems. Voltage transformers are indispensable in the measurement of voltage and overload protection to guarantee the stability and security of the system during normal operation and maintenance.
Compatibility: ZN85-40.5 High Voltage Vacuum Circuit Breaker is designed with international standards such as IEC 62271, GB/T 11022, ensuring safety and reliability in high voltage electrical systems. Adaptation: switching cabinet width 1200mm can install KYN61-40.5 or the like.
Applications: Widely applied in power plants, substations, and industrial enterprises, especially for voltage measurement, system protection, and high voltage operation during maintenance to ensure normal operation of electrical equipment without influencing the power supply.
Design and safety:
Misoperation, such as drawing out or inserting PT at the wrong time, can be avoided because the ZN85-40.5 trolley has an interlocking mechanism against misoperation, which offers additional safety during maintenance. It ensures smooth and safe operation of the trolley and minimizes risks during maintenance.
Product standard
ZN85-40.5 high voltage vacuum circuit breaker complies with the following standards:
IEC 62271-100 High voltage AC circuit breaker
GB/T 11022-2011 Standard General Specification for High Voltage Switchgear and Controlgear
GB 1984 High voltage AC circuit breaker
GB 311.1 Insulation coordination of high-voltage power transmission and distribution equipment
Working conditions
Rated voltage: 40.5 kV
Power frequency withstand voltage: 95 kV
Lightning impulse withstand voltage: 185 kV
Ambient temperature: -40℃ to +40℃ (temperature below 35℃ within 24 hours)
Relative humidity: ≤95% (daily average) or ≤90% (monthly average)
Altitude: ≤1000 meters
ZN85-40.5 is designed in such a way that it can be more conveniently used and maintained in high-voltage electrical equipment, which will be especially suitable for important protection links in high voltage power systems.
Technical Parameters
1.1 Technical parameters
| Item Unit | Reference value | |
| Rated yoltag | kV | 40.5 |
| Lightning impulse withstand voltage | kV | 185 |
| Rated insulation level 1min power-frequency withstand voltage | kV | 95 |
| Rated frequeng, | Hz | 50/60 |
| Rated current | A | 630/1250/1600/2000/2500/3150 |
| Rated short-circuit breaking current | kA | 20/25/31.5 |
| Rated short-circuic making current (peak value | kA | 506,380 |
| Rated short-time withstand current | kA | 20/25/31.5 |
| Rated withstand current (peak value | kA | 506,380 |
| Required operation sequence | 0-0.3s-CO-180s-CO | |
| Rated short-circuit duratio | 5 | 4 |
| Times of making-breaking with the rated short-circuit curren | Time | 30 |
| Mechanical life | M2 level | |
| Weigh | kg | 350 |
1.2 Mechanical Parameters
| ltem | Unit | Reference value |
| Gap of contacts | mm | 20±2 |
| Contact overtravel | mm | 6±1 |
| Average making speed | m/s | 0.6±0.2 |
| Average breaking speed | m/s | 1.5~2.0 |
| Bounce time in contact making | ms | ≤3 |
| Non-synchronous making/breaking of contact | ms | ≤2 |
| Resistance of the circuit of each phase | μ Q | ≤80 |
| Permissible total wear thickness of the moving/fixed contact | mm | 3 |
Overall And Installation Dimension
Overall dimension of ZN85-40.5(insulating cylinder handcart)indoor high-voltage alternating-current circuit breaker
| Rated current(A) | 630 | 1250 | 1600 | 2000 | 2500 |
| Rated breaking current(kA) | 202,531.5 | 202,531.5 | 2,531.5 | 31.5 | 31.5 |
| Fixed contact size D(mm) | φ35 | φ49 | 中55 | φ79 | φ109 |
| Interphase distance(mm) | 300±1.5 | ||||
| Handcart travel(mm) | 610±2 |
Insulating cylinder type dimensions
Solid seal type dimensions 
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