YFGZS2-12D Vacuum Circuit Breaker

Product Overview

The YFGZS2 series indoor high-voltage AC vacuum circuit breaker is a product successfully developed independently by our company. It meets the performance requirements specified in the national standard GB 1984-2014 "High-Voltage AC Circuit Breakers" as well as the international IEC 62271 standard. Featuring outstanding electrical and mechanical properties, this high-voltage vacuum circuit breaker boasts a reliable and stable mechanism, safe and dependable arc interruption, extended electrical life, and the ability to handle frequent operations. It can reliably interrupt large short-circuit currents while requiring minimal maintenance. Additionally, it provides a clearly visible isolation gap for enhanced safety.

The product’s excellent insulation and mechanical properties ensure reliable operation even in heavily contaminated environments. Equipped with advanced mechanical and electrical interlocking mechanisms, it delivers exceptional operational stability and dependability, safeguarding both personnel and equipment—and ensuring safe electricity usage.

● Miniaturization: Cabinet width as low as 500mm, with a depth of 900mm.
● Integrated Design: Featuring a compact, frame-based structure, this high-performance, miniaturized high-voltage electrical product integrates an isolating switch, vacuum circuit breaker, and grounding switch into a single unit.
● Modular Design: Equipped with the self-developed CTE6-type spring operating mechanism, which requires minimal operating power and features a modular design for easy inspection and maintenance when needed.
● When the isolating switch is in the open position, the clearance between the isolating blade and the cabinet body exceeds 125 mm (for cabinets with a width of 500 mm).
● Metal partitions (compliant with China Southern Power Grid standards) can be installed to separate the busbar room and switchgear room.
● The circuit breaker and load switch have identical external dimensions, making them easy to integrate into cabinets.
● A comprehensive "five-protection" interlocking system ensures simple and reliable cabinet-based "five-protection" interlocks.
● (Upper and Lower Double Isolation) When the isolating switch is in the open position, the isolation blade maintains a ground clearance of more than 125 mm (for cabinets with a width of 500 mm).
● Both the isolating switch and circuit breaker can be equipped with electric operating mechanisms, offering dual functionality—electric and manual operation—and enabling remote control.

Model Description

Environmental operating conditions

a. Altitude not exceeding 1000m;
b. Ambient temperature range: -25°C to +40°C;
c. The daily average relative humidity does not exceed 95%, and the monthly average remains below 90%;
d. The surrounding air should be free from obvious contamination by corrosive or flammable gases, water vapor, and the like;
e. Areas free from fire and explosion hazards;
f. Locations with seismic intensity not exceeding 8 degrees and slope angles no greater than 5 degrees.

Main technical specifications

Structural Features

The YFGZS2-12 indoor high-voltage AC vacuum circuit breaker features a compact design, with each phase’s energized components supported by a single insulating bushing. It integrates the functions of an isolator switch, vacuum circuit breaker, and grounding switch into one unit. The upper outgoing line of the isolator switch connects directly to the busbar, while the rotating end of the isolator blade serves as the upper stationary contact of the vacuum arc-extinguishing chamber. Meanwhile, the lower outgoing terminal of the vacuum arc-extinguishing chamber acts as the stationary contact for the grounding switch—effectively maximizing space utilization within the switchgear. The busbar compartment and cable compartment of the switchgear are separated by a metal partition installed in the center of the insulating bushing. The operating mechanism is integrated with the main unit, forming a side-mounted structure that supports both manual and electric operation modes. Additionally, the "five-protection" interlocking system is built directly into the operating mechanism housing.

Operating Instructions and Interlock Requirements

Optimization of On/Off Indication
● Refer to the circuit breaker operation indicator plate shown on the right. The open/close indications for each switch are integrated with a primary simulation diagram. The illustrated state represents the maintenance mode: the circuit breaker is in the open position, the isolating switch is also open, and the grounding switch is closed—all indicated in green. When the system is energized, all open/close indicators turn red. In practical use, you can quickly determine the status of each switch simply by checking the color of the corresponding indicator.

Interlocking methods for circuit breakers, disconnect switches, and grounding switches
● The isolating switch can only be opened after the circuit breaker has been tripped; and the earthing switch can only be closed after the isolating switch has been opened.
● The isolating switch can only be closed after the grounding switch is open; the circuit breaker can only be closed after the isolating switch is closed; and once the circuit breaker is closed, it cannot be closed again.
● The cabinet door can only be opened after the grounding switch is closed.
● The grounding switch can only be opened after the cabinet door is closed.

Circuit breaker operation (installed upright on the switch side, with left-hand operation)
● The energy required to close the circuit breaker is provided by the closing spring. Energy can be stored either by driving a motor with an external power source or by manually operating the storage handle. To manually store energy, insert the storage handle into the storage operation shaft and turn it counterclockwise until you hear a distinct "click," indicating that the energy storage process is complete.
● Turning the on/off knob clockwise closes the circuit; once fully closed, the circuit breaker’s on/off indicator changes from green to red.
● Turning the on/off knob counterclockwise will trip the circuit breaker; once tripped and fully engaged, the circuit breaker’s status indicator will change from red to green.
● The electrically operated switch is controlled by on and off buttons for motorized operation.

Operation of the isolating switch (installed upright on the side of the switch, with left-hand operation)
● Turning the operating key counterclockwise closes the circuit; once fully closed, the disconnector’s open/close indicator changes from green to red.
● Turning the operating key clockwise will open the circuit; once the switch is fully opened, the disconnection indicator changes from red to green.

Operation of the grounding switch (installed upright on the side of the switch, with left-hand operation)
● Turning the operating key clockwise will open the circuit breaker; once fully opened, the grounding switch’s opening/closing indicator will change from green to red.
● Turning the operating key counterclockwise closes the circuit; once fully closed, the grounding switch’s open/closed indicator changes from red to green.

The operation of locking the cabinet door
● Closing the cabinet door automatically releases the interlock between the door and the grounding switch.
● Once the earthing switch is closed and the cabinet door is opened, the cabinet door and the earthing switch automatically interlock.

Vacuum Circuit Breaker Outline Diagram

YFGZS2-12D/T1250-31.5 Indoor High-Voltage AC Vacuum Circuit Breaker
Side-mounted, forward-facing left-hand operation switch (dimensions match those of circuit breakers without pre-charged closing mechanisms).

YFGZS2-12D/T630-25 (Electrically Isolated) Indoor High-Voltage AC Vacuum Circuit Breaker
Side-mounted, forward-facing left-hand operation switch (dimensions match those of circuit breakers without pre-charged closing mechanisms).

YFGZS2(2G)-12/T630-25 (Double Isolation, Up and Down) Indoor High-Voltage AC Vacuum Circuit Breaker
Side-mounted, forward-facing left-hand operation switch (dimensions match those of circuit breakers without pre-charged closing mechanisms).

Schematic Diagram of Vacuum Circuit Breaker Cabinet

YFGZS2-12D/T630-25
Indoor High-Voltage AC Vacuum Circuit Breaker Indoor AC High-Voltage Vacuum Circuit Breaker
Side-mounted, standard installation with left-hand operation (cabinet width 500 × cabinet depth 900 × cabinet height 2000) – Installation diagram included