VS1 12kV Medium-Voltage Indoor Drawout Vacuum Circuit Breaker, 31.5kA-Zhejiang Mingtuo Electrical Technology Co., Ltd.

VS1 12kV Medium-Voltage Indoor Drawout Vacuum Circuit Breaker, 31.5kA

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

High Voltage Vacuum Circuit Breaker
VS1 Medium-Voltage Indoor Vacuum Circuit Breaker
VCB Composition

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

Insulating Cylinder
Main Product
Moving Contact
Flexible Connection
Touch And Touch Arm Cover
Bearer Supporting Bracket
Insulating Cylinder
Vaccum Tube
1
2
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Mechanical Characteristic Testing
Withstand Voltage Test
Product Debugging
Product Debugging
Product Debugging
Product Debugging
Withstand Voltage Test
High Voltage Vacuum Circuit Breaker
VCB Composition
VS1 Medium-Voltage Indoor Vacuum Circuit Breaker
VCB Composition

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.

High and Low Voltage Switchgear (ACB, MCCB, VCB)
Box-Type Substation Featuring Our VCB, MCCB, and A
High And Low Voltage Cabinets Successfully Powered

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 -

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Indoor Vacuum Circuit Breakers

VS1 12kV Medium-Voltage Indoor Drawout Vacuum Circuit Breaker, 31.5kA