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What is Vacuum Circuit Breaker

Vacuum circuit breakers (VCBs) are widely used in medium-voltage power distribution systems to control and protect electrical circuits. By using vacuum interrupters to extinguish the arc during current interruption, VCBs provide reliable switching and fault protection for transformers, cables, motors and other electrical equipment.

Kechang Electric provides vacuum circuit breakers for substations, industrial plants, commercial buildings and medium-voltage distribution networks. Different rated voltages, currents, breaking capacities and operating mechanisms can be configured according to project requirements, making the VCB suitable for various indoor switchgear and power distribution applications.

Core Advantages of Our Vacuum Circuit Breaker

Reliable Vacuum Interruption

Vacuum interrupters provide effective arc interruption and electrical isolation, supporting reliable switching under normal operating and fault conditions.

Flexible Electrical Ratings

VCBs are available with different rated voltages, rated currents and short-circuit breaking capacities to meet the requirements of different medium-voltage power systems.

Compact & Low Maintenance

The vacuum interrupter is sealed and does not require conventional arc-extinguishing media, helping simplify maintenance and supporting long-term reliable operation.

Electrical Vacuum Breaker
Rated Voltage:10KV 35KV 66KV
Rated Current:630A 1250A 2000A
Rated Breaking Capacity:25kA 31.5kA 40kA
Operation Mechanism:Spring-Operated/Electromagnetic
Protection...
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High-reliability Withdrawable Vacuum Circuit Breaker
Products Introduction Our pull-out vacuum circuit breaker is specially developed for 10kV-40.5kV medium voltage power systems and is the core switchgear in the power distribution link.It combines...
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High Voltage Side Mounted VCB
Rated Voltage:10KV 24KV 35KV
Rated Current:630A 1250A 2000A 3150A
Rated Short-Circuit Breaking Capacity:25kA 31.5kA 40kA
Insulation Level:LI75kV/AC42kV LI125kV/AC50kV...
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Embedded Poles Type VCB
Rated Voltage:10KV 24KV 35KV
Rated Current:630A 1250A 2000A 3150A
Rated Short-Circuit Breaking Capacity:25kA 31.5kA 40kA
Insulation Medium:Epoxy Resin Solid...
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Handcart Type Vacuum Circuit Breaker
Rated Voltage:10KV 35KV 66KV
Rated Current:630A 1250A 2000A 3150A
Rated Short-Circuit Breaking Capacity:25kA 31.5kA 40kA
Insulation Level:LI75kV/AC35kV LI170kV/AC70kV...
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Vacuum Disconnector
Rated Voltage:10KV 35KV 66KV
Rated Current:630A 1250A 2000A
Rated Short-Time Withstand Current:25kA 31.5kA 40kA
Insulation Level:LI75kV/AC35kV LI170kV/AC70kV...
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Mv Vacuum Circuit Breakers
Rated Voltage:10KV 20KV 35KV
Rated Current:630A 1250A 2000A
Rated Short-Circuit Breaking Capacity:25kA 31.5kA 40kA
Insulation Level:LI75kV/AC35kV LI170kV/AC70kV...
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Lateral Indoor VCB
Rated Voltage:10KV 35KV
Rated Current:630A 1250A 2000A
Rated Short-Circuit Breaking Capacity:25kA 31.5kA 40kA
Operation Mechanism:Spring-Operated
Insulation...
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Gas Insulated Vacuum Circuit Breaker
Rated Voltage:10KV 35KV 66KV
Rated Current:630A 1250A 2000A
Rated Short-Circuit Breaking Capacity:25kA 31.5kA 40kA
Insulation Medium:SF₆ Gas/Dry Air
Protection Level:IP44...
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High Voltage Breaker
Rated Voltage: 12 kV
Rated Current: 630A/1250A/1600A/2000A/2500A/3150A/4000A
Short-Circuit Breaking Capacity: 20 kA
Short-Time Withstand Current: 20 kA
Lightning Impulse...
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Indoor SF6 Circuit Breaker
Rated Voltage: 12kV
Rated Current: 630A/1250A/1600A/2000A/2500A/3150A/4000A
Short-Circuit Breaking Capacity: 20kA
Short-Time Withstand Current: 20kA
Peak Withstand Current:...
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High Voltage Air Circuit Breaker
Rated Voltage: 10kV, 35kV, 66kV, 110kV
Rated Current: 630A, 1250A, 2000A, 3150A, 4000A
Rated Short-Circuit Breaking Current: 25kA, 31.5kA, 40kA, 50kA
Rated Short-Time Withstand...
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Vacuum Circuit Breaker

A vacuum circuit breaker is a type of breaker that employs a vacuum as the medium for extinguishing arcs. The permanently sealed vacuum interrupter of this circuit breaker houses both the fixed and movable contacts. The separation of contacts within a high vacuum ensures the extinction of the arc. This device is used to prevent the unexpected current which is caused because of the short circuit in any system. Also it interrupts the voltage in some applications. Basically arc quenching takes place in this in the vacuum medium. Insulating medium is high for the arc extinction as compared to the other circuit breakers.

Operating environment

Ambient temperature：
Maximum temperature: +40℃ Minimum temperature: -15℃
Daily average value is not more than +35℃ Altitude: not more than 1000m
Daily average relative humidity: ≤95%

Monthly average relative humidity: ≤90%
Earthquake intensity: no more than 8 degrees
And places without dripping water, steam, flammable gas, fire, explosion danger, chemical corrosion and severe vibration.
The vacuum arc chamber adopts reliable metallization process and welding structure, which can operate with power for a long time.

Product Specifications

Number	Parameter name	Unit	Technical Parameters
1	Rated voltage	KV	12
2	Rated short-time frequency withstand voltage (1 min)	KV	42
3	Rated lightning impulse withstand voltage (peak)	KV	75
4	Rated frequency	Hz	50
5	Rated current	A	630/1250/1600/2000/2500/3150/4000
6	Rated short-circuit breaking current	KA	20	25	31.5	40
7	Rated short-time withstand current	KA	20	25	31.5	40
8	Rated short circuit duration	S	4
9	Rated short-circuit closing current	KA	50	63	80	100
10	Rated peak withstand current	KA	50	63	80	100
11	Number of rated short-circuit current starts	Times	30	30	30	20
12	Rated individual capacitor bank opening current	A	≤630
13	Rated back-to-back capacitor bank opening current	A	≤400
14	Rated capacitor bank closing inrush current	KA	12.5(frequency≤1000Hz)
15	Closing time	ms	≤80
16	Split time	ms	Maximum Voltage		≤40
		ms	Rated Voltage		≤50
		ms	Minimum Voltage		≤60
17	Time of ignition	ms	≤15
18	Mechanical life (M2)	Times	30000
19	Allowable cumulative thickness of dynamic and static contact wear	mm	3
20	Rated closing operating voltage	V	AC/DC 220, AC/DC 110
21	Rated breaking operating voltage	V	AC/DC 220, AC/DC 110
22	Rated operating voltage of energy storage motor	V	AC/DC 220, AC/DC 110
23	Rated power of energy storage motor	W	80 (40KA Motor speed 100W)
24	Energy storage time	S	≤15
25	Contact opening distance	mm	9±1
26	Over traveling distance	mm	3.5±0.5
27	Contact closing bounce time	ms	≤2
28	Three-phase switching and closing non-synchronous	ms	≤2
29	Contact splitting rebound amplitude	mm	≤3
30	Contact closing contact pressure	KA	20	25	31.5	40
30	Contact closing contact pressure	N±8%	2200	2500	3100	4750
31	Average breaking speed (contacts separated by 6mm)	m/s	1.1±0.2
32	Average closing speed (6mm contact closure)	m/s	0.6±0.2
33	Dominant electric circuit resistance	A	630	1250	1600-2000	≥2500
34	Dominant electric circuit resistance	μΩ	≤50	≤45	≤35	≤25
34	Rated operating sequence (1) 20~31.5KA		Minutes - 0.3s - combined minutes - 180s - combined minutes
35	Rated sequence of operation (2) 40KA		Minutes - 0.3s - combined minutes - 180s - combined minutes
35	Secondary circuit frequency withstand voltage (1min)	V	2000

Benefits of using Vacuum Circuit Breakers

Another fascinating aspect of vacuum circuit breakers is that they are commonly utilised in modern electrical systems because of the following vacuum circuit breaker advantages.

Long Service Life
Given that vacuum interrupters are subjected to a very low amount of wear and tear arising from contact erosion, the VCBs can last a century or so without requiring much overhaul. Another advantage of this long service life is the ability to lower operational costs.

Efficient Arc Quenching
The arc almost disappears in these breakers. This makes it easy to protect the contacts and prevents accidents, thus reducing the time taken to repair.

Environmentally Friendly

Vacuum circuit breakers are environmentally preferable to other circuit breakers that use greenhouse gases such as sulphur hexafluoride.

Compact Design

Since they are to be installed in small and restricted spaces, VCBs are lighter and more compact than older transformer designs. This makes them popular in industries where space is an important constraint, such as commercial real estate.

Low Maintenance

VCBs are less costly to operate since they almost never have arcing gases that need replacement frequently, and contact erosion is also minimal compared to traditional circuit breakers.

Applications of Vacuum Circuit Breaker

As a kind of high-speed switching equipment, vacuum circuit breaker (VCB) is widely used in various industrial fields.
These circuit breakers are very suitable for systems with a voltage range of 11V to 33kV.
They are usually used in conjunction with static overcurrent relays to achieve a total disconnect time of less than 40 milliseconds in the event of interphase failure.
VCB is used in high-voltage circuits, generators and substations.
They are especially suitable for cutting off dual ground faults and phase currents.
These circuit breakers are ideal when fast and high-frequency switching is required.They are also used in railway applications, such as power supply switching and traction current management.
Vacuum circuit breakers play an important role in motor drive switch control in various applications.

Components of Vacuum Circuit Breakers

VCBs contain many of the same components as other circuit breakers with the addition of a vacuum interrupter. The main components are as follows:

Fixed contact

Electricity flows into the circuit and goes through the fixed or stationary contact. This contact stays in place whether the circuit is open or closed.

Movable contact

The current flows from the fixed contact to the movable contact. If the circuit is tripped, the movable contact moves away from the fixed contact, stopping the flow of electricity.

Vacuum interrupter

In a VCB, the arc is created in a vacuum. A vacuum is an excellent insulator and quickly extinguishes the arc.

Actuator mechanism

The actuator mechanism is connected to the tripping mechanism and the movable contact. Whenever the circuit is tripped, it forces the actuator mechanism to move the circuits apart.

Vacuum Circuit Breaker Maintenance

Visual Assessment

Distinguish signs of wear, erosion, or physical harm.

Contact Upkeep

Guarantee appropriate current conduction and minimize contact resistance.

Vacuum Interrupter Testing

Confirm the judgment of the vacuum interrupter, the heart of the VCB.

Component Support

Keep up the working mechanism's effectiveness and reaction time.

Cover Framework Support

Avoid cover breakdown, which can lead to brief circuits.

Control Circuit and Wiring Check

Guarantee the unwavering quality of the control framework and assistant circuits.

Assistant Component Assessment

Survey extra components that back VCB operation.

Utilitarian Testing

Affirm that the VCB works as aiming beneath recreated blame conditions.

Certificates

FAQ

Q: When can I receive the quotation?

A: Under normal circumstances, we will provide a quotation within 24 hours after receiving your inquiry.

Q: How long is the delivery cycle?

A: Usually the delivery cycle is about 15 to 20 days.

Q: What kind of after-sales service do you provide?

A: All our products provide a 12-month warranty period.

Q: How do you solve the quality problem?

A: Please provide detailed photos of the quality problem.Our technical and quality inspection department will conduct a comprehensive analysis and provide you with a satisfactory solution within 2 working days.

Q: Do you accept product customization?

A: We provide OEM/ODM services and can print your logo on the product.Our professional technical and quotation team can provide you with a satisfactory solution based on your drawings and parameters.

As one of the leading circuit breaker manufacturers and suppliers in China, we warmly welcome you to wholesale cheap circuit breaker from our factory. All customized products are with high quality and competitive price.

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