● ZN85-40.5 indoor MV vacuum circuit breaker (hereinafter referred to as circuit breaker), suitable for three-phase AC 50Hz, rated voltage 40.5kV power system, can be used for industrial and mining enterprises, power plant and substation as opening and closing load current, overload current, fault current use.
Circuit breaker and operating mechanism adapt the upper and lower arrangement of institutions, effectively reducing the circuit breaker depth.
● Three-phase arc extinguishing chamber and associative charged body is isolated by three independent epoxy resin insulating cylinder, composite insulating structure, The circuit breaker meets the air distance and creepage distance requirements under normal operating conditions,and effectively reduces the volume of circuit breaker. The vacuum interrupter of the main current ring and the dynamic and static conductive connections are installed in the insulating cylinder with a distance of only 300mm.The electrical connection of the main circuit is fixed connection, which has high reliabilityhas the very high reliability. Insulating cylinder is arranged on the upper side of the circuit breaker frame.
● The overall layout is reasonable, beautiful appearance, simple. It has the characters of small volume, flexible operation, with reliable electrical performance, long service life, convenient maintenance, maintenance free.
● The circuit breaker is suitable for frequent operation, various occasions and places with harsh operating conditions.
● Standard: IEC 62271-100.

Selection

Operating conditions

1. Ambient temperature -10℃ ~ +40℃
2. Altitude ≤ 1500m;
3. Relative humidity: the daily average is not greater than 95%, the monthly average is not greater than 90%, the daily average of saturated steam is not greater than 2.2* 10- ³Mpa, and the monthly average is not greater than 1.8* 10- ³Mpa;
4. The earthquake intensity does not exceed 8 degrees;
5. Places free of fire, explosion hazards, severe pollution, chemical corrosion and severe vibrations.

Features

1. Adopt the lead screw propulsion mechanism, labor saving, stable, good self-locking performance.
2. Small volume, flexible operation, with characters of reliable electrical performance, long service life, easy maintenance, low maintenance.

Installation

1. The installation form of ZN85 vacuum circuit breaker in switch cabinet can be fixed, can also be drawout style, has good interchangeability.
2. This series handcart type circuit breaker is mainly used for 1400mmKYN61 ground cabinet, fixed type circuit breaker is used for XGN-40.5, GG1A-40. 5 and box type substation etc..

Actuator

1. Vacuum circuit breaker ZN85 using the integral type 3AV3 spring operating mechanism, mechanism is relatively mature, stable and reliable.
2. Mechanism design is simple, the output curve and the performance is more suitable for the characteristics and requirements of 40.5kV vacuum circuit breaker.

Technical data

Overall and mounting dimensions(mm)

External dimensions of insulating cylinder type

Dimensions of solid seal type