ZN85 indoor high-voltage alternating-current vacuum circuit breaker has a frequency of 50Hz and a rated voltage of 40.5kV.It applies to theelectrical equipment control and protection in industrial and mining enterprises,power plants and substations,particularly to the places needingfrequent operation.It can be fixed in a switch cabinet or installed on a handcart.
With stable performance and convenient installation,it is the best choice for the control and protection of high-voltage power transmission
and distribution systems.
ZN85 indoor high-voltage alternating-current vacuum circuit breaker is produced in line with the following standards and codes.
● IEC 62271-100 High-voltage alternating-current circuit-breakers
● GB/T 11022-2011 Common specifications for high-voltage switchgear and controlgear standards
●GB 1984 High-voltage alternating-current circuit-breakers
●GB 311.1 Insulation co-ordination for high voltage transmission and distribution equipment
Normal operating conditions
● Ambient temperature:-40℃~+40℃(below 35℃ within 24 hours)
● Relative humidity:≤95%(daily average)or ≤90%(monthly average)
● Altitude:≤1000m
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 |
| 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 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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