Indoor high-voltage vacuum circuit breakerDetailed product description：

ZN57-12 indoor high-voltage vacuum circuit breaker is used in XGN15-12 (Z) box type fixed AC metal enclosed switchgear, which can replace the load switch as the incoming switch of the distribution substation and provide backup protection for the outgoing cabinet; At the same time, it can also be used as an outgoing line protection switch and a distribution transformer with a control capacity greater than 1250kVA. It can also be used as a connecting circuit breaker for dual power supply incoming lines. This product is suitable for 3.6-12kV three-phase AC single busbar and single busbar segmented distribution systems.

Structural characteristics of ZN57-12 circuit breaker:

·The circuit breaker adopts a three column structure, with three vacuum arc extinguishing chambers fixed in insulation cylinders cast with epoxy resin. The phases are solid insulated, with small external dimensions and a phase distance of 210mm (similar to SF6 load switches), making it easy to install in XGN15-12 high-voltage switchgear and share the main busbar with SF6 load switchgear;
·The operating mechanism and circuit breaker are arranged in an integrated manner, with the mechanism installed on the side and the three-phase arc extinguishing chamber arranged in the rear, middle, and front. The operating mechanism can be installed outside the switch cabinet door for easy maintenance of the operating mechanism and its auxiliary switches. Its transmission system structure is simple, with few adjustment steps, fully ensuring the mechanical characteristic parameters of the arc extinguishing chamber, and the mechanical life can reach 20000 times. Circuit breakers have high reliability and require minimal maintenance.
·Oil free and pollution-free environment.
·The vacuum arc extinguishing chamber adopts copper chromium contact material and longitudinal magnetic field contact structure, which has the advantages of strong breaking ability, high insulation strength, low current cutoff value, light burning loss, long electrical life, and maintenance free operation throughout the entire working period.

ZN57-12 indoor high-voltage vacuum circuit breaker operating environment:

The ambient air temperature is+40 ℃, -15 ℃;
Altitude not exceeding 1000 meters;
Environmental temperature: Daily average relative humidity not exceeding 95%, monthly average relative humidity not exceeding 90%; Water vapor pressure: daily average not exceeding 2.2kPa, monthly average not exceeding 1.8kPa;
A place without fire, explosion, severe pollution, chemical corrosion, and severe vibration.