Indoor Vacuum Circuit Breaker
Your Leading Indoor Vacuum Circuit Breaker Supplier
Trust In Grid Co., Ltd. is a professional transformer manufacturer, specializing in the design and production of power transformer, high-voltage switchgear, power distribution equipment, energy storage systems (ESS), magnetic wire, bushing and machining parts. Our power transformers are available in 500KV, 330KV, 220KV, and 110KV models, and are widely used in power utilities, renewable energy systems (solar and wind), industrial facilities, data centers, transportation infrastructure, and OEM applications.
Why Choose Us?
Production Capacity
With 6 factories covering 240,000 m², over 2,000 employees, and 200+ engineers, we support large-scale projects and long-term global supply with more than 30 years of export experience.
Advanced Equipment
We operate a complete set of in-house production equipment, including cutting, winding, CNC machining, vacuum drying, and testing systems, with over 450 machines ensuring stable quality and efficient output.
Quality Control
All products are manufactured and tested in compliance with IEC, IEEE, ANSI, CSA, UL/cUL, CE, and ISO 9001:2015 standards, ensuring reliable performance and smooth international approval.
OEM & ODM Capability
Our engineering team provides OEM/ODM support, including customized design and technical optimization, delivering tailored solutions for utility, industrial, and renewable energy projects.
Technical Specifications of Indoor Vacuum Circuit Breaker
|
No. |
Parameter |
Unit |
Value 1 |
Value 2 |
|
1 |
Rated voltage |
KV |
12 |
12 |
|
2 |
Power-frequency withstand voltage (phase-to-phase and earth) |
KV |
42 |
42 |
|
3 |
Lightning impulse withstand voltage (phase-to-phase and earth) |
KV |
75 |
75 |
|
4 |
Rated current |
A |
630 |
125 (for fuse) |
|
5 |
Rated short-circuit breaking withstand current |
KA |
50 (for fuse) |
- |
|
6 |
Rated short-time withstand current |
KA |
20 |
- |
|
7 |
Rated peak withstand current |
KA |
50 |
- |
|
8 |
Rated short-circuit making current |
KA |
50 |
- |
|
9 |
Rated cable charging breaking current |
A |
16 |
- |
|
10 |
Rated AC breaking current |
A |
3150 |
- |
|
11 |
Breaking capacity for no-load transformer |
KVA |
1250 |
- |
Advantages of Indoor Vacuum Circuit Breaker
High Reliability
Indoor VCBs offer stable performance and consistent protection in electrical systems.
Long Service Life
Vacuum circuit breakers can perform tens of thousands of switching operations.
Low Maintenance
They require minimal servicing because vacuum interrupters experience very little wear.
Compact Design
Indoor breakers are designed to fit inside compact switchgear panels.
Safe Operation
The sealed vacuum chamber prevents exposure to external environmental factors.
Environmentally Friendly
Unlike oil or SF6 circuit breakers, VCBs do not use hazardous insulating materials.
Components of a Indoor Vacuum Circuit Breaker
It is a group of different types of parts operating parts, protection parts, and moving mechanisms. The parts details are given below mentioned points.
Operating mechanism
The operating mechanism is the important part of ACB which is used for the operation of on or off. This is operated as manually or electrically. In this on and off push button is installed for manually operating and closing coil and shunt coil is used electrically.
Protection release
Microprocessors-based releases are used for ACB protection. It is used for overload, short circuit, and earth fault.it is set as per time set.
The release is an electrical device that is used for mechanical output in pre-defined set points. different types of release are used such as shunt release for tripping, Under-voltage release for voltage monitoring, closing release for breaker on condition, spring charging motor for mechanism spring of circuit breaker.
Cradle
Cradle is used for rack in or rack out of ACB. Draw out ACB is installed on the cradle for moving the breaker in and out.
Interlocking
Interlocking is used for protection in ACB. It is electrically and mechanically types. in electrically the closing coil is interlocked and the operating mechanism is locked manually.
Terminal
Terminals are used for power connecting and disconnecting of the circuit breaker.it is used vertically, horizontally, and rear type.
Arch shoot
The arch shoot is a chamber for quenching the arch during making and breaking contact in the breaker. It is made with many strips in a box so that the arc can be distributed.
Customization Options
Material: Customizable
Logo: Customizable
Structure: Customizable
MOQ: Customizable
The Difference Between Indoor Vacuum Circuit Breaker and Outdoor Vacuum Circuit Breaker
Both indoor and outdoor vacuum circuit breakers use the same arc-extinguishing technology, but their applications and designs differ significantly.
Understanding these differences helps you select the right equipment for your project
|
Feature |
Outdoor VCB |
Indoor VCB |
Typical Voltage Range |
Installation Environment |
Operational Control |
|
Installation |
Outdoor substations |
Indoor switchgear panels |
Medium voltage |
Exposed to weather |
Remote or SCADA |
|
Design |
Rugged, weatherproof |
Compact metal-clad |
11kV–40.5kV |
Indoor controlled |
Local control |
|
Insulation |
High creepage distance |
Standard insulation |
Medium voltage |
Protected environment |
Manual/automatic |
|
Maintenance |
Less frequent |
Easy indoor access |
Medium voltage |
Clean environment |
Panel-based |
Power Distribution Systems
Vacuum circuit breakers are extremely important in medium-voltage power distribution. They protect the transformers and cables during power supply by quickly interrupting faults such as short circuits. So, these circuit breakers maintain a constant power supply in industrial and commercial areas.
Industrial Facilities
In industrial plants and factories, these breakers protect heavy machinery as well as critical equipment. They make sure the high-power environments do not suffer from costly machinery damage due to electrical faults.
Switchgear Equipment
Vacuum circuit breakers are commonly used in setting up controls and relays that govern and protect electrical switches, or switchgear systems. These circuit breakers are essential in providing great fault protection and averting damage to electrical parts within the power distribution networks.
Renewable Energy Systems
Vacuum circuit breakers are used in the protection of the electrical parts of the system in renewable energy facilities like wind and solar farms. They enhance the operational effectiveness of these green energy sources and guarantee safe functioning.
Commercial Buildings
Used in office towers, shopping centres, and even hospitals, vacuum circuit breakers are prevalent in commercial buildings.
Data Centers
Vacuum circuit breakers guard equipment such as servers from electric faults in data centers where uninterrupted power is imperative. This keeps the stored data safe while minimizing the chances of service interruption or data loss.
Mining Operations
A mining vacuum breaker electrical is utilized to protect electrical machinery in extreme mining conditions. They assist in avoiding equipment failures and permit the smooth functioning of mining machines in remote and perilous places.
Integrity Testing Method for Indoor Vacuum Circuit Breakers
Vacuum integrity testing: A high-potential (hi-pot) AC or DC withstand test applied across the open contacts of each vacuum interrupter confirms that the vacuum level remains sufficient to provide adequate dielectric strength. A deteriorating vacuum will fail to withstand the test voltage, signaling that the interrupter must be replaced before returning the breaker to service.
Contact erosion measurement: Each switching operation erodes a small amount of contact material. Most VCB designs include a mechanical indicator — a visible stroke length marker or a wear gauge on the contact travel linkage — that shows the remaining contact material. When the indicator reaches the replacement threshold, the vacuum interrupter must be changed even if the vacuum integrity test passes.
Mechanism lubrication and timing checks: The operating mechanism linkages, latch components, and closing spring assembly require periodic lubrication with appropriate grease to prevent increased friction that could slow operating times and cause protection timing deviations. Contact timing measurements using a circuit breaker analyzer verify that opening and closing times remain within the manufacturer's specified tolerances.
Insulation resistance testing: Megger testing of the main circuit insulation and the control wiring insulation detects moisture ingress, surface contamination, or insulation degradation that could lead to tracking or flashover under operating voltage conditions.
Ordering Process
Send Us Inquiry → Receive Our Quotation → Negotiate Details → Confirm the Sample → Sign Contract/Deposit → Mass Production →cargo Ready → Balance/Delivery → Further Cooperation
Payment Terms
T.T with 30% downpayment, 70%before shipment.
Paypal or West Union also accept.
Our Service Highlights
Pre-Sales Consultation & Design Support
Early technical engagement to define requirements and deliver optimized solutions.
During Sales & Project Execution
Transparent project management with controlled production, quality tracking, and on-time delivery.
Warranty Advantage
Minimum 2-year warranty on all products, ensuring reliable and risk-free operation.
After-Sales Support
24/7 technical support with fast response, spare parts availability, and training services.
Long-Term Partnership
Lifelong technical support and upgrade guidance for sustained performance.
Packaging & Shipping
Packaging details:
Shockproof foam/moisture-proof film, professional export cartons/wooden crates/pallets.
Final assembly ensures mechanical integrity and readiness for transportation and installation.
Certificates
We're well-known as one of the leading indoor vacuum circuit breaker manufacturers and suppliers in China, also support customized service. Please feel free to buy high quality indoor vacuum circuit breaker made in China here from our factory. Contact us for more details.
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