VS1 Medium-Voltage Indoor Vacuum Circuit Breaker 12kV 1250A for MV Switchgear

Description: The MINGTUO 12kV Indoor Vacuum Circuit Breaker (VCB) is specifically designed for medium-voltage switchgear applications, providing high-performance protection and control for industrial, commercial, and infrastructure power systems. Rated at 1250A, this breaker is suitable for both fixed and drawout installation, offering robust fault-interruption capability, long operational life, and advanced safety features. Its compact and modular design ensures reliable operation while simplifying maintenance and installation procedures.

This medium-voltage indoor vacuum circuit breaker offers a complete solution for safe, reliable, and efficient power distribution. Its flexible installation, advanced vacuum interruption technology, long service life, and comprehensive protection features make it suitable for a wide range of industrial, commercial, and critical infrastructure applications.

Applications:

MINGTUO VCBs are essential components in medium-voltage electrical systems, providing both control and protection across a variety of scenarios:

Power Generation:

Generator protection and output control in thermal and hydropower plants

Integration with solar and wind energy systems

Auxiliary power distribution for plant equipment

Transmission & Distribution Networks:

Protection of substation feeders and distribution transformers

Ring main unit and indoor switchgear applications

Fault isolation in urban and industrial power distribution

Industrial Systems:

High-capacity motor protection in steel and manufacturing plants

Transformers and rectifier safeguarding in chemical facilities

Underground and surface power distribution in mining operations

Infrastructure & Public Services:

Railway and metro traction power supply systems

Airport, hospital, and data center backup power protection

Industrial parks and commercial building power distribution

Harsh or Special Environments:

Offshore platform electrical systems

Desert mining operations and extreme climate installations

High-altitude substations requiring robust, reliable breakers

Under normal operation, the breaker’s main contacts remain closed, allowing uninterrupted current flow. During overload or short-circuit events, the thermal or magnetic trip mechanism activates. The spring mechanism ensures rapid contact separation, generating a controlled electric arc. This arc is immediately directed into the vacuum interrupter, where it is cooled, divided, and extinguished. This process isolates the faulty section, protects downstream equipment, and prevents damage to the overall system. The result is fast fault clearance, safe operation, and minimal maintenance requirements.

Product Accessories

_0000_insulatingcylinder
_0001_DJI_20260103104102_0928_D
_0002_DJI_20260103103919_0923_D-副本
_0003_DJI_20260103103837_0918_D
_0004_DJI_20260103103824_0916_D
_0005_DJI_20260103103731_0912_D
_0006_DJI_20260103103632_0905_D
_0008_abf9b1d7cd710147614401e454b35663
_0009_a2215ea91d970ecc6aa6d7f4be459931
_0007_c6c658c768e219054c6eeb0de8db2337
_0010_a412801fb401b68fe4de3d978b4eaae4

Raw material quality:

①The internal circuit of the institution has undergone 24-hour aging testing, and the circuit board components are equipped with rectifier bridges. The material of the vacuum tube has undergone a series of tests, including vacuum degree testing, dust-proof workshop, pressure resistance testing, increased air pressure testing for ceramic leakage, long-term storage in tanks, and constant temperature and humidity storage.
	② The weight of the insulation cylinder is 4.8kg, and the material is heat-resistant and flame-retardant
③ Soft connection (630A5 thick (strong current carrying capacity), electroplated (low circuit resistance) silver copper, 1250A6 pieces. )Different from other manufacturers using thin, non electroplated silver plating
	④ Contact made of purple copper and silver plated material, with better conductivity
⑤ Chassis car (handcart type) made of copper silver plated material, more durable and more sensitive
	⑥ The shell frame is made of high-temperature resistant and flame-retardant materials
⑦ The vacuum tube adopts a ceramic shell, which has better insulation performance，it is big tube
	⑧The soft connection adopts thick material silver electroplating, which is different from other manufacturers' thin electroplating. It has stronger current carrying capacity and lower circuit resistance

Management Quality:

① Warehouse inspection (vacuum tube appearance, insulation tube appearance)

② Semi finished product testing

③ Mechanism opening and closing more than 30 times, circuit resistance

④ Exceeding 3.5 (the distance that can be extended by removing the static contact and the moving contact)

⑤ Left and right overtravel distance (distance when the dynamic and static contacts are opened)

⑥ Synchronization and speed of closing and opening, full detection of three bounce parameters

⑦ Finished product testing (opening and closing test, voltage withstand test)

⑧ Packaging inspection (checking surface half parameters, opening and closing buttons)

MINGTUO Vacuum Circuit Breakers are designed to exceed standard expectations:

Rapid fault interruption with high short-circuit breaking capacity up to 40kA

Minimal contact wear and extended electrical lifespan due to advanced vacuum technology

Fully insulated construction with visible isolation gaps for safety

Integrated mechanical interlocks to prevent misoperation

Digital monitoring and remote operation options for modern smart grids

Compliant with IEC 62271-100 and ANSI C37.04 standards

Routine type and performance tests, including withstand voltage, mechanical operating time, and contact resistance measurements

5-year warranty for long-term reliability

Product Debugging.mp4
Product Debugging2.mp4
Product Debugging3.mp4
Product Debugging4.mp4
Product Debugging5.mp4
Product Debugging6.mp4
Product Debugging7.mp4

To ensure transportation safety, our electrical products are exported in reinforced wooden crates. The crates undergo heat treatment and bear the ISPM-15 mark, enabling swift customs clearance. The raised base design facilitates forklift operation, while internal shock-absorbing fastening ensures the products arrive intact. All exterior crates are clearly labeled and comply with international logistics standards.

Power transmission successful
Photovoltaic Grid-Connected Cabinet Utilising ACB and MCCB
Box-typesubstation ACB VCB MCCB
Box-typesubstation ACB VCB MCCB
Box-typesubstation ACB VCB MCCB
Box-typesubstation ACB VCB MCCB
Photovoltaic Grid-Connected Cabinet Utilising ACB and MCCB
Power transmission successful
Power transmission successful
Photovoltaic Grid-Connected Cabinet Utilising ACB and MCCB

No	Item	Units	Count value
1	The rated voltage	-	12 24 35
2	The rated voltage (short-term frequency tolerance 1min)	kV	42
3	The rated voltage tolerance lightning shocks peak	-	75
4	Rated frequency	Hz	50
5	Rated current	A	630、1250
			630、1250、1600、2000、2500、3150
			1250、1600、2000、2500、3150、4000
6	Rated short open circuit current	kA	20/25、31.5、40
7	The rated voltage short tolerance	kA	20/25、31.5、40
8	Rated short duration	s	4
9	Rated current peak tolerance	kA	50/63、80、100
10	Rated short-circuit current close	kA	50/63、80、100
11	The secondary circuit frequency voltage tolerance 1min)	V	2000
12	Rated singleback capacitor set open circuit current	A	630/400 (40kA 800/400)
13	Rated capacitor set close currents	kA	12.5 (frequency no greater than 1000Hz)
14	Break-brake time (rated voltage)	ms	≤50
15	Feeder time (rated voltage)	ms	≤100
16	Mechanical life	-	20000
17	Rated current open circuit times (life)	Switching	20000
18	Rated short-circuit current open circuit	-	50(40kA≤30)
19	Dynamic and static contact allow wear thickness	mm	3
20	The rated operating voltage feeder	-	-
21	The rated voltage break-brake operations	V	AC110/220 DC110/220
22	Storage motor rated voltage	-	-
23	Storage motor power rating	W	70
24	Storage time	s	≤10
25	Contact opening distance	mm	11 ± 1
26	Super-trip	-	3.5 ± 0.5
27	Closing contact bounce time	ms	≤240(A≤3)
28	Three-phase points, closing at different stages of sexual	-	≤2
29	Average gate speed (contact separation-6mm)	m/s	0.9–1.2
30	Average closing speed (6mm-contact closure)	m/s	0.5–0.8
31	Leading electric circuit resistance	μΩ	≤50(630a)、≤45(1250A) ≤35(1600–2000A)、≤250(2400)
32	Contactor feeder contact pressure	N	2000±200(2000A)、2400±200(25kA) 3100±200(31.5kA)、4250±250(40kA)
33	The rated operating sequence	-	Points - 0.3s - and points 180s - and -

Message Feedback

Indoor Vacuum Circuit Breakers

VS1 Medium-Voltage Indoor Vacuum Circuit Breaker 12kV 1250A for MV Switchgear