Product features

◆ Adopting fixed sealing pole technology.
◆ The product adopts a modular design: a framework structure, integrating isolation switches, sealed vacuum circuit breakers, grounding switches, sensors, interlocking mechanisms, and operating mechanisms into a high-performance compact design
High voltage electrical products.
◆ Adapted cabinet size is (450 x 1000 x 1800) mm
Rotating isolation switch with visible break after opening.
There is a forced mechanical interlocking between the isolation switch, circuit breaker, and grounding switch to prevent accidental operation.
The circuit breaker adopts a modular operating mechanism, which can be independently replaced or repaired, and has good interchangeability. It can be operated manually, or AC and DC energy storage operations can be selected to achieve remote control.
The cabinet door and grounding switch are designed with a reliable interlocking structure to ensure the safety of operators.

normal condition

◆ Surrounding air temperature: -25 ℃ to+40 ℃;
◆ Relative humidity: daily average ≤ 95%, monthly average ≤ 90%;
◆ Altitude: not exceeding 1000 meters;
Earthquake intensity: not exceeding 8 degrees;
◆ Place of use: No explosion hazard, chemical and violent vibration.

Applicable cabinet type

Applicable cabinet types can be assembled in small fixed cabinets, ring main cabinets, or box transformers. The main circuit of the FSZ-12GD series indoor high-voltage three station vacuum circuit breaker is longitudinally arranged, with the upper part being the isolation switch and the middle part being the
The vacuum circuit breaker is equipped with a grounding switch at the bottom, and the operating mechanism, circuit breaker mechanism, and interlocking mechanism are located at the front of the switch. This switch can be installed upside down.

Main parameters and technical performance

Rated voltage: 12kV
(1min) Rated short-time power frequency withstand voltage: Phase to phase: 42/48kV
Rated lightning impulse withstand voltage (peak): Phase to phase: 75/85kV
Secondary circuit power frequency withstand voltage (1min): 2000V
Rated frequency: 50Hz
Rated current: 630/1250A
Rated short-circuit breaking current: 20/25/31.5kA
Rated peak withstand current: 50/63/80kA
Rated short-circuit making current: 50/63/80kA
Rated short-term withstand current for 4 seconds: 20/25/31.5kA
Rated short-term withstand current duration: 4 seconds
Rated single/back-to-back capacitor bank breaking current: 630/400A
Rated capacitor bank making inrush current: 12.5 (frequency not exceeding 1000Hz) kA
Rated short-circuit current breaking frequency: 30 times
Mechanical lifespan (isolation switch/circuit breaker/grounding) 3000/10000/3000
Accumulated thickness of allowable wear for dynamic and static contacts: 3mm
Rated closing operating voltage: AC24/48/110/220V
Rated opening operating voltage: DC24/48/110/220V
Rated voltage of energy storage motor: AC24/48/110/220V
Rated power of energy storage motor: 70W
Energy storage time:<15s
Contact opening distance: 9 ± 1mm
Overtravel: 2.5 ± 0.5mm
Contact closing bounce time: ≤ 2ms
Three phase opening and closing asynchrony: ≤ 2ms
Opening time (rated voltage): ≤ 40ms
Closing time (rated voltage): ≤ 60ms
Average opening speed (contact opening -6mm): 0.9-1.3m/s
Average closing speed (6mm - contact just closed): 0.5-1.1m/s
Contact opening rebound amplitude: ≤ 2mm
Contact closing pressure: 2400 ± 200 (20-25kA) 3100+200N
Rated operating sequence: 0-0.3s-CO-180s-CO