1 Overview
The ZW32-40.5 outdoor high-voltage vacuum circuit breaker adopts a uniquely designed integrated solid sealed pole and a highly reliable operating mechanism. This device is mainly used in medium voltage overhead power grids for the purpose of dividing and combining load currents, overload currents, and short-circuit currents.
U has extremely high reliability
U is completely maintenance free throughout its entire lifespan
U has high mechanical and electrical lifespan
The whole machine has a small volume, light weight, and is easy to install
1.1 Usage conditions

Surrounding air temperature: -30 ℃ to+60 ℃;
Altitude: not exceeding 3000 meters;
Wind speed not exceeding 34m/s;
External vibrations or ground movements from switchgear and control equipment can be ignored;
Pollution level: Level IV;
Storage temperature: -40 ℃ to+85 ℃.
1.2 Technical Parameters

Main technical parameters of circuit breaker
serial number
project
unit
Numerical value
1
rated voltage
kV
40.5
2
rated current
A
1250/1600
3
rated frequency
Hz
50 or 60
4
Power frequency withstand voltage for 1 minute (wet) (dry)
Interphase, ground/fracture
kV
80 㻟/95
5
Lightning impulse withstand current (peak value)
Interphase, ground/fracture
kV
185
6
Rated short-circuit breaking current
kA
25/31.5
7
Rated short-circuit closing current (peak)
kA
63/80
8
Rated peak withstand current
kA
63/80
9
4S short-time withstand current
kA
25/31.5
10
Rated operating cycle
Split -0.1s - Split -3s - Split -6s - Split -60s Recovery
11
Rated short-circuit current breaking times
time
30
12
mechanical life
time
10000
13
Institutional control voltage
V
AC/DC220
14
Secondary circuit 1-minute power frequency withstand voltage
KV
2
Main mechanical parameters of circuit breakers
Number,
parameter name
unit
data
1
Contact opening distance
mm
16±1
2
Contact overtravel
mm
4±0.5
3
Opening speed
m/s
1.4-1.8
4
Closing speed
m/s
0.4-0.8
5
Contact closing bounce time
ms
≤5
6
Center distance between phases
mm
600±2
7
Three phase opening and closing asynchrony
ms
≤2
8
Resistance of each phase conductive circuit
μ Omega
＜80
9
Closing time
ms
25~45
10
Opening time
ms
20~45
11
weight
Kg
About 450
2. Structure and working principle of circuit breakers

ZW32-40.5 outdoor high-voltage vacuum circuit breaker is mainly composed of integrated solid sealed pole, current transformer, operating mechanism, and box body. This model of circuit breaker is designed for miniaturization, with a high-quality stainless steel casing. Current transformers can be selected according to user needs.


ZW32-40.5/Circuit Breaker Outline Drawing
ZW32-40.5 outdoor high-voltage vacuum circuit breaker and its matching intelligent control combination. The switch can be opened and closed locally, or remotely controlled through a communication interface. Other information of the circuit breaker can also be transmitted to the control center, and communication channels can be selected from cables, optical fibers, GPRS/CDMA, GSM, etc.
Working principle of 3 circuit breakers

3.1 Arc extinguishing principle: ZW32-40.5 outdoor high-voltage vacuum circuit breaker adopts a vacuum arc extinguishing chamber, using vacuum as the arc extinguishing and insulation medium, with extremely high vacuum degree. When the moving and stationary contacts are charged and disconnected under the action of the operating mechanism, a vacuum arc will be generated between the contacts. At the same time, due to the special structure of the contacts, an appropriate longitudinal magnetic field will also be generated in the gap between the contacts, which promotes the vacuum arc to maintain a diffusion type and evenly distributes the arc on the surface of the contacts to burn, maintaining a low arc voltage. At the natural zero crossing of the current, residual ions, electrons, and metal vapor can recombine or condense on the surface of the contacts and the shielding cover in microseconds. The dielectric insulation strength of the arc extinguishing chamber fracture is quickly restored, and the arc is extinguished to achieve the purpose of disconnection. Due to the use of longitudinal magnetic field control for vacuum arc, vacuum circuit breakers have strong and stable breaking current capability.
3.2 Electric energy storage: The electric motor applies the output torque to the small gear of the mechanism, which is transmitted to the large sprocket on the main shaft, thereby driving the crank arm to rotate and storing energy in the closing spring. When the screw on the crank arm presses down the travel switch, the power supply to the motor is cut off and the spring energy storage is completed.
3.3 Manual energy storage: Rotate the output shaft of the rotating mechanism, and transmit the rotational torque to the fully meshed large gear through the small gear on the output shaft, thereby driving the crank arm to rotate and storing energy in the closing spring.
3.4 Closing Electromagnetic Operation: After the mechanism receives the closing signal, the moving iron core of the closing electromagnetic moves upward, pushing the closing release rod to move upward, causing the closing half shaft to rotate counterclockwise. Release the constraint on the closing stopper, and at the same time, the closing stopper rotates counterclockwise under the pressure of the roller, releasing the energy storage maintenance. The cam located on the main shaft generates an impact force due to the contraction force of the closing spring, which collides with the rocker arm on the manual energy storage shaft (i.e. output shaft), and is transmitted to the switch through the connecting rod to complete the closing operation.
3.5 Manual operation: When the fork installed on the closing half shaft rotates counterclockwise, it drives the closing half shaft to rotate counterclockwise. Thus producing the same effect as the operation of the closing electromagnet.
3.6 Reclosing operation: After releasing the energy of the energy storage spring, the mechanism completes the closing operation. In the closed state, the mechanism performs energy storage operation again. After completing the energy storage operation, the mechanism is in the closed and stored state. Once the correct signal is received in this state, the mechanism can achieve an automatic reclosing operation.
3.7 Opening Electromagnetic Operation: After the mechanism receives the opening signal, the moving iron core of the opening electromagnetic moves upward, pushing the opening release rod to move upward, causing the opening half shaft to rotate counterclockwise. Release the constraint on the switch breaker. At the same time, the opening stopper rotates counterclockwise under the pressure of the roller, and the rocker arm rotates counterclockwise due to the pushing force of the opening spring inside the switch, thus completing the opening operation.
3.8 Manual operation: When the fork installed on the opening half shaft rotates counterclockwise, it drives the opening half shaft to rotate counterclockwise, thereby producing the same effect as operating the opening electromagnet.
3.9 Overcurrent release operation: When the overcurrent coil in the overcurrent release passes through the specified release current, the electromagnet will act and the push rod will push the release rod. Rotate the half shaft of the circuit breaker counterclockwise to release the constraint on the circuit breaker and produce the same effect as the operation of the opening electromagnet, completing the overcurrent tripping operation of the circuit breaker.
Ordering Notice:
When placing an order, the user should provide the model, name, quantity, current ratio, specifications, quantity, and accuracy level of the current transformer for the breaking current of the product, as well as whether a transition frame is installed and the height dimension of the transition frame. When ordering for the renovation of old stations, users should specify the original installation dimensions of the old station.
After-sales service
Our company adheres to the spirit of quality, efficiency, and development, with the concept of high-quality products and thoughtful services. We solemnly promise to you publicly and responsibly as follows:
1. The minimum warranty period for all products sold by our factory is one year, and some products have a three-year warranty. During the warranty period, free on-site repairs are provided, except for malfunctions or damages caused by human factors or uncontrollable natural phenomena.
2. Upon receiving the repair notice, arrive at the scene within seven working days and resolve the issue.
3. Users can consult technical issues through after-sales telephone and obtain clear solutions.
When users experience performance failures during normal use, our company promises the above warranty services. In addition, if there are clear provisions in the applicable laws and regulations of the country, our company will comply with the relevant laws and regulations.
During the warranty period, paid repair services will be provided for the following situations:
Damage caused by human or uncontrollable natural phenomena.
Malfunctions or damages caused by improper operation.
Malfunctions or damages that occur due to modifications, disassembly, or assembly of the product