VD4 12kV Medium-Voltage Indoor Vacuum Circuit Breaker, 630A–1250A

The MINGTUO VD4 12kV Vacuum Circuit Breaker (VCB) is a medium-voltage indoor breaker designed to provide precise protection and control for three-phase AC systems operating at 50Hz, with rated voltages from 3.6kV to 12kV. Supporting rated currents from 630A to 1250A, this breaker is ideal for indoor switchgear installations in substations, industrial facilities, and commercial power distribution systems. Employing advanced vacuum interrupter technology, it ensures rapid fault interruption, operational reliability, and long-term safety.

Design and Construction:

Constructed with a spring-operated mechanism and a compact, modular layout, the VD4 breaker ensures efficient operation and straightforward maintenance. Epoxy resin insulated poles offer excellent dielectric strength and durability. The fixed or drawout trolley design allows flexible installation and easy access for inspection or maintenance. The mechanical structure provides fast and safe interruption of overloads and short-circuits, protecting both equipment and personnel.

Environmental and Installation Requirements:

Ambient Temperature: -5°C to +40°C, with 24-hour average ≤ +35°C. Operation at -10°C or -25°C requires prior confirmation.

Altitude: Installation sites up to 2000 meters above sea level.

Humidity: Maximum 50% at +40°C; higher humidity is allowed at lower temperatures. Monthly average relative humidity can reach 90% in wet months, with minimum temperature ≥ +25°C. Condensation caused by temperature changes must be considered.

Protection Class: IP30

Usage Category: Class A or B

Installation Category: Primary circuits ≤690V: category N; auxiliary/control circuits: category III

Installation Guidelines: Vertical tilt ≤5° (≤15° for mining breakers). Strict compliance with the manual is required for proper operation.

Operation Principle:

Under normal conditions, main contacts remain closed to allow continuous current flow. Upon detecting overcurrent or a short-circuit, the spring mechanism quickly separates the contacts, producing an arc contained within the vacuum interrupter. The arc is cooled and extinguished, safely isolating the faulty circuit and preventing damage to downstream equipment. This ensures high operational reliability and minimal maintenance needs.

Advantages and Features:

Competitive pricing with stringent factory quality control

Customizable housing options to suit specific installation requirements

Extensive production and installation experience, with professional guidance

Support for commissioning and selection to ensure smooth deployment

Reliable interruption of overload and short-circuit currents

Compact, modular design with durable insulation and IP30 protection

Compliance with IEC and GB standards for medium-voltage vacuum circuit breakers

Applications:

Indoor medium-voltage switchgear panels

Industrial plants requiring reliable MV protection

Commercial infrastructure including hospitals, airports, and data centers

Systems demanding frequent operation and low-maintenance solutions

Reliability:

The VD4 breaker is engineered for high operational endurance, offering maintenance-friendly design and long electrical lifespan. Its vacuum interrupters ensure safe arc extinction, low contact wear, and stable performance under variable environmental conditions, reducing downtime and operational costs.

Conclusion:

MINGTUO’s VD4 12kV 630A–1250A Vacuum Circuit Breaker provides safe, efficient, and reliable medium-voltage protection. With flexible installation options and robust performance, it is a key device for modern indoor switchgear applications in industrial, commercial, and critical infrastructure settings.

Advantages:

Exceptionally competitivepricing, with rigorous factory quality assurance
Housing options fully customizableand tailored to your exact specifications
Deep-rootedexpertise in production and installation, providing expertguidance at every step
Dedicated supportthroughoutcommissioning and selection for a seamless experience

Product Accessories

Place of Origin:	5th Floor, No. 3, Jinghong West Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province
Brand Name:	MINGTUO
Model Number:	VCB(ZN63)
Certification:	IOS CE ROHS

Minimum Order Quantity:	1
Price:	500$
Packaging Details:	Wooden box packaging
Delivery Time:	Within fifteen days
Payment Terms:	100% prepaid, 70%/30%, 80%/20%
Supply Ability:	Available at any time

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

VD4 12kV Medium-Voltage Indoor Vacuum Circuit Breaker, 630A–1250A