Description
ZN85 is a high voltage vacuum circuit breaker with frequency of 50Hz and rated voltage of 40.5kV. It is very suitable for use in industrial and mining enterprises, power plants and substations where frequent operation is required. Its stable performance and easy installation make it an ideal choice for control and protection in high-voltage transmission and distribution systems.
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
Normal operating conditions:
Ambient temperature: -40℃ to +40℃ (temperature below 35℃ within 24 hours)
Relative humidity: ≤95% (daily average) or ≤90% (monthly average)
Altitude: ≤1000 meters
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 | ||||
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