ZN39-40.5/1250A Indoor Draw-out Type High-Voltage Vacuum Circuit Breaker

ZN39-40.5(35)KV series indoor high-voltage vacuum circuit breaker (alias: 35KV indoor vacuum switch), suitable for three-phase AC 50Hz, rated voltage 40.5kV power systems, and complies with the GB1984 "AC High-Voltage Circuit Breaker" standard. This product can be matched with JYN1-35, GBC-35 switchgear, and the matching includes components such as isolation carts and PT carts.

The circuit breaker adopts a cart-type structural design, and the arc extinguishing chamber is supported by two insulators and an insulating plate, which is suitable for installation in cart-type switchgear. Its operating mechanism can be equipped with electromagnetic mechanical CD10-III or spring mechanical CT19N, and is equipped with an interlock device to realize forced mechanical locking, meeting the "five preventions" function requirements of the switchgear. The product has multiple specifications such as model ZN39-40.5/630-25 to ZN39-40.5/2500A-31.5KA.

The ZN39-40.5 series indoor high-voltage vacuum circuit breaker is an indoor device for three-phase AC 50Hz with a rated voltage of 40.5kV. The overall design is a cart-type structure, and each arc extinguishing chamber is supported by two insulators and an insulating plate, which is convenient for installation in a cart-type switchgear. The circuit breaker can be equipped with electromagnetic and spring operating mechanisms. The cart is equipped with grounding contacts to ensure reliable grounding when the cart is in the working position or test position.

The ZN39-40.5 series indoor high-voltage vacuum circuit breaker is a 40.5kV rated voltage three-phase AC 50Hz high-voltage distribution device, widely used in power systems of power plants, substations, and industrial and mining enterprises, for power acceptance, control, and protection.

The circuit breaker adopts a cart-type structural design, which is convenient for matching with switchgear models such as JYN1-35 and GBC-35, and can include components such as isolation carts and PT carts. Its arc extinguishing chamber is supported by two insulators and an insulating plate, with a stable overall structure, reasonable layout, and convenient installation and commissioning. The circuit breaker adopts air insulation, meeting the air insulation distance and creepage distance requirements under normal operating conditions.

The following are the main technical specifications of the ZN39-40.5 series circuit breakers:

Rated voltage: 40.5 kV.

Rated current: covers multiple grades such as 630A, 1000A, 1250A, 1600A, 2000A, and 2500A.

Rated short-circuit breaking current: 25 kA or 31.5 kA.

Rated short-circuit closing current: 63 kA or 80 kA.

Rated peak withstand current: 63 kA or 80 kA.

Rated short-time withstand current: 25 kA or 31.5 kA, with a duration of 4 seconds.

Rated operation sequence: open-0.3s-close-open-180s-close-open.

Mechanical life: 10,000 times.

Number of rated short-circuit breaking current operations: 30 times.

Rated insulation level:

1-minute power frequency withstand voltage: 95 kV (pole-to-ground, pole-to-pole, and between contacts).

Lightning impulse withstand voltage: 185 kV (pole-to-ground, pole-to-pole, and between contacts).

This circuit breaker can be equipped with an electromagnetic operating mechanism (CD10-II or CD10-III type) or a spring operating mechanism (CT19N type), supporting AC, DC, or manual operation. The product is equipped with a set of mechanical interlock devices. When matched with switchgear, it can realize the "five preventions" function requirements of the switchgear through forced mechanical locking, ensuring operational safety.

To ensure the normal operation of the equipment, its working environment must meet the following basic conditions:

Ambient temperature: -25℃ to +40℃ (allowable temperature for storage and transportation is -30℃).

Altitude: not exceeding 1000 meters.

Air humidity: daily average relative humidity not exceeding 95%, monthly average relative humidity not exceeding 90%.

Other requirements: The installation site shall be free of fire and explosion hazards, free of severe pollution, chemical corrosion, and violent vibration, and the seismic intensity shall not exceed 8 degrees.

Product application and compatibility

The ZN39-40.5 series circuit breakers are suitable for places requiring frequent operations. In addition to serving as protection and control units for new projects, they are also commonly used in the oil-free transformation of oil-immersed circuit breakers in original switchgear models such as JYN1-40.5 and GBC-40.5.