Zhuhai Comking Electric Co.,Ltd.
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1. CKVB-24/GB is the withdrawable circuit breaker.
2. Technical Data
| Description | Unit | Parameter | ||||
| Rated voltage | kA | 24 | ||||
| Rated short-time withstand voltage | phase-to-phase phase-to-earth | kA | 65 | |||
| open contact | kA | 79 | ||||
| Rated lighting impulse withstand voltage | phase-to-phase phase-to-earth | kA | 125 | |||
| open contact | kA | 145 | ||||
| Rated frequency | Hz | 50 | ||||
| Pole centre distance | mm | 210, 230 | ||||
| Rated current | A | 630 | 1250 | |||
| Rated short-time withstand current(4s) | kA | 25 | 31.5 | 25 | 31.5 | |
| Rated peak withstand current | kA | 63 | 80 | 63 | 80 | |
| Rated short-circuit breaking current | kA | 25 | 31.5 | 25 | 31.5 | |
| Rated short-circuit making current | kA | 63 | 80 | 63 | 80 | |
| Rated breaking cable charging current | A | 25 | ||||
| Rated capacitor bank inrush making current | kA | 12.5 | ||||
| Rated single capacitor bank breaking current | A | 630 | ||||
| Rated back to back capacitor bank breaking current | A | 400 | ||||
| Operating sequence | / | Opening-0.3s-Closing/Opening-180s-Closing/Opening | ||||
| Mechanism life | times | 20000 | ||||
| Opening times for rated current | times | 20000 | ||||
| Opening times for rated short-circuit current | times | 50 | ||||
| Clearance between open contacts | mm | 13±1 | ||||
| Overtravel | mm | 4±1 | ||||
| Average closing speed | m/s | 0.8～1.2 | ||||
| Average opening speed | m/s | 1.1～1.7 | ||||
| Closing time | ms | 35～70 | ||||
| Opening time | ms | 20～50 | ||||
| Bounce time for contact’s closing | ms | ≤2 | ||||
| Asynchronous time for three-phase contacts closing / opening | ms | ≤1 | ||||
| Allowable accumulated wearing thickness of moving/fixing contact | mm | 3 | ||||
3. Standard
---- GB1984-2003
---- IEC60056-2001
---- GB/T16927-1997
----GB/T 4473-2008
---- DL/T403-2000
---- JB/T3855-2008
4. Working Condition
4.1 Ambient air temperature: -25℃～+40℃
4.2 Ambient humidity:
---- relative average daily humidity: ≤95%
---- relative average daily water vapor pressure: ≤2.2kPa
---- relative average monthly humidity: ≤90%
---- relative average monthly water vapor pressure: ≤1.8kPa
4.3 Altitude: ≤1000m
4.4 Earthquake intensity: ≤magnitude 8
4.5 Ambient air doesn’t obviously pollute by dust, smoke, corrosive or combustible gas, vapors or salt spray.
(Exceeding above working condition is available as customized product)