Indoor High Voltage Vacuum Circuit Breaker
Introduction - High Voltage Vacuum Circuit Breaker [Electrical Switch] ZN28-12 Series Indoor High Voltage Vacuum Circuit Breaker applies to three-phase 50Hz, 12KV rated voltage power system. It meets GB1984-89 standards. Its overall structure can adopt integration installation of switch and operation mechanism or separation installation of the switch and the operation mechanism. The former one is ZN28-12 basic type. The latter one is ZN28A-12 type which applies to various fixed Switchgear e.g.: GG-1A(Z), XGZ2A10(Z), etc. it can configure CD17, CD10A DC electromagnetic actuator and CT17, CT19 spring energy storage actuator.Working & Environmental Conditions - Indoor High Voltage Vacuum Circuit Breaker
1. Environmental temperature: Maximum +40 °C, minimum -15 °C
2. Altitude: ≤1000m
3. Humidity: Daily average relative humidity <95%, Daily steam pressure < 2.2kPa, monthly average relative humidity < 90%, monthly
4. Earthquake intensity < 8°
5. No flammable, explosive, dangerous chemical corrosion or dramatic shake.
6. Steam pressure <1.8kPa
Model Meaning
Main Parameters - Indoor High Voltage Vacuum Circuit Breaker
| Name | Unit | Data | ||||
| 20KA | 25KA | 31.5KA | 40KA | |||
| Rated voltage | KV | 12 | ||||
| Rated frequency | HZ | 5 | ||||
| Rated current | A | 630, 1000, 1250 | 1250, 1600 | 1250, 1600, 2000, 2500 | 1600, 2000, 2500, 3150 | |
| Short circuit breaking current (peak value) | KA | 20 | 25 | 31.5 | 40 | |
| Rated short circuit closing current (peak value) | KA | 50 | 63 | 80 | 100 | |
| Rated peak value dynamic stable current | KA | 50 | 63 | 80 | 100 | |
| 4S rated thermal stable current | KA | 20 | 25 | 31.5 | 40 | |
| Rated insulation level | 1 min work frequency voltage tolerance (RMS) | KV | 42 | |||
| Lightening impact current tolerance (peak value) | 75 | |||||
| Rated operation sequence | O-T-CO-T″-CO | |||||
| Mechanical life span | Times | 10000 | ||||
| Rated breaking times of short circuit current | Times | 30 | 20 | |||
| Actuator rated Switch closing current (DC) | V | 110, 200 | 220 | |||
| Actuator rated Switch opening current (DC) | V | 110, 200 | ||||
| Name | Unit | Data | ||
| Contact openness size | Mm | 11±1 | ||
| Contact excess travel (contact spring compressed length) | Mm | 4±1 | ||
| Time differences of three-phase closing switch in the same period | Ms | ≤2 | ||
| Closing switch and bouncing time | Ms | ≤2 | ||
| Average Switch opening time (contact opens 6mm height) | M/s | 1.1±0.2 | ||
| Average Switch closing time | M/s | 0.6±0.2 | ||
| Switch opening time | Maximum operation voltage | S | ≤0.06 | |
| Minimum operation voltage | ≤0.08 | |||
| Switch closing time | S | ≤0.2 | ||
| Main circuit resistance of each phase | μΩ | ≤40 | ≤30 | |
| Dynamic, static allowed accumulated attrition contact thickness | Mm | 3 | ||
| Code data model | 20KA 25KA 31.5KA | 40KA |
| A | 230 | 275±1 |
| B | 600 | 690 |
| C | 707 | 842 |
| D | 560 | 652 |
| E | 2930-2 | 3420-2 |
| F | 227±1 | 227±1 |
| Rated current | 20KA 25KA 31.5KA | 40KA | ||
| Code | A | B | A | B |
| Data | 250 | 610 | 275 | 690 |
Picture I Contour Dimensions Diagram of ZN28A-12 Vacuum Circuit Breaker
Picture II Contour Dimensions Diagram of ZN28-12/T Vacuum Circuit Breaker
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Complete set switchgear-Power Control System
