Overview
The ZN85-40.5/T2000-31.5 indoor high voltage vacuum circuit breaker is suitable for three-phase AC 50Hz, rated voltage 40.5kV power systems, and can be used in industrial and mining enterprises, power plants, and substations for switching load current, overload current, and fault current. The circuit breaker adopts a vertically arranged structure with the operating mechanism, effectively reducing the depth of the circuit breaker.
The spring operating mechanism specially designed for this new type of circuit breaker is installed inside the circuit breaker frame. Its structural characteristics are more suitable for the vertical arrangement of the circuit breaker and become an inseparable part of the overall structure of the circuit breaker. The mechanism design is simple, and its output curve and performance are more suitable for the characteristics and requirements of 40.5kV vacuum circuit breakers.
This circuit breaker is suitable for frequent operation and various occasions and harsh operating conditions.
Main Technical Parameters
| Item | Unit | Data |
| Rated voltage | kV | 40.5 |
| Rated current | A | 1250 1600 2000 |
| Rated frequency | Hz | 50 |
| Rated short-circuit breaking current | kA | 25 31.5 |
| Rated short-circuit making current (peak) | kA | 63 80 |
| 4S rated short-time withstand current | kA | 25 31.5 |
| Rated peak withstand current | kA | 63 80 |
| 1min power frequency withstand voltage | kV | 95 |
| Lightning impulse withstand voltage (peak) | kV | 185 |
| Rated operating sequence | 0-0.3s-CO-180s-CO | |
| Breaking current of single capacitor bank | A | 630 |
| Breaking current of back-to-back capacitor bank | A | 400 |
| Rated operating voltage | V | -110/~110,-220/~220 |
