Huanghua Group Co., Ltd. 
ZN85-40.5 Indoor AC High-Voltage Vacuum Circuit Breaker
Overview
ZN85-40.5 Indoor AC High-Voltage Vacuum Circuit Breaker (hereinafter referred to as circuit breaker) is suitable for three-phase AC 50Hz, rated voltage 40.5kV power system, and can be used for industrial and mining enterprises, power plants and substations to separate and connect load current, overload current and fault current.
The circuit breaker and the operating mechanism adopt an upper and lower arrangement structure, which effectively reduces the depth of the circuit breaker.
The three-phase arc extinguishing chamber and the connected live body are isolated by three independent epoxy resin insulation cylinders to form a composite insulation structure. The circuit breaker meets the air distance and creepage distance requirements under normal operating conditions and effectively reduces the volume of the circuit breaker.
The vacuum arc extinguishing chamber of the main conductive circuit and the dynamic and static conductive connection are installed in the insulation cylinder, so that the phase spacing is only 300mm. All the main circuit electrical connections are fixed connections with high reliability. The insulation cylinder is installed above the circuit breaker frame.
The spring operating mechanism specially designed for this new type of circuit breaker is installed in the circuit breaker frame. Its structural characteristics are more suitable for the upper and lower layout of the circuit breaker and become an integral part of the overall structure of the circuit breaker. The mechanism design is simple, and the output curve and its performance are more suitable for the characteristics and requirements of the 40.5kV vacuum circuit breaker.
The overall layout is reasonable, beautiful and simple. It is small in size, flexible in operation, has reliable electrical performance, long service life, convenient maintenance, and maintenance-free mechanism.
This circuit breaker is suitable for frequent operation and various occasions and places with harsh operating conditions.
Main Technical Parameters
| Item | Unit | Data |
| Rated voltage | kV | 40.5 |
| Rated frequency | Hz | 50 |
| Rated current | A | 1250、 1600、 2000 |
| 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 | kA | 95 (phase-to-phase, to earth) / 110 (across open contacts) |
| Lightning impulse withstand voltage (peak) | kA | 185 (phase-to-phase, to earth) / 215 (across open contacts) |
| Rated operating sequence | — | O-0.3s-CO-180s-CO |
| Breaking times of rated short-circuit breaking current | times | 30 (for 25kA) / 20 (for 31.5kA) |
| Mechanical endurance (mechanical life) | operations | ≤80 |
| Breaking time | ms | 630 |
| Rated single capacitor bank breaking current | A | 400 |
| Rated back-to-back capacitor bank breaking current | A | DC110/AC110、DC220/AC220 |
| Rated operating voltage | V | DC 110 / AC 110, DC 220 / AC 220 |
Dimension
