VEGM-12GD Indoor Three-Station Vacuum Circuit Breaker

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Product Introduction

VEGM-12GD is an indoor high voltage three-position vacuum circuit breaker, specially designed for 12kV power system, integrating three functions of disconnector, grounding switch and circuit breaker. The product adopts vacuum arc extinguishing technology, with high reliability, long life and low maintenance, suitable for power system protection and control in substations, industrial and mining enterprises, power plants and other places.

Product features

◆Three-station integrated design:

Integrates circuit breaker, disconnector and grounding switch

Reduces equipment footprint and simplifies distribution system structure

◆Advanced vacuum arc extinguishing technology:

Adopts high-performance vacuum arc extinguishing chamber

Oil-free, SF6-free, excellent environmental performance

Strong breaking capacity, small arc energy

◆Reliable mechanical structure:

Spring operating mechanism, fast opening and closing speed

Mechanical interlocking device to prevent misoperation

Modular design, easy maintenance

◆Intelligent control:

Can be equipped with intelligent controller to achieve remote monitoring

Support multiple communication protocols (optional)

With status monitoring and fault diagnosis functions

◆Safety protection:

Fully enclosed metal shell, high protection level

Visual isolation break, safe and reliable

Complete five-protection interlocking function

Application areas

12kV distribution system protection and control
10kV outgoing line protection for substations
Industrial and mining enterprise distribution systems
Power plant power systems
Urban power grid distribution automation systems

Installation and maintenance

Suitable for indoor installation, ambient temperature -15℃~+40℃

Relative humidity ≤95% (at 25℃)

Altitude ≤1000m (special design required for higher altitudes)

Long maintenance cycle, only regular inspection of mechanical parts and electrical connections required

Technical Datas

Item	Unit	Parameter
Rated voltage	kV	12
(1min) Rated short-time power frequency withstand voltage: phase to phase/break		42/48
Rated lightning impulse withstand voltage(peak): phase-to-phase/break		75/85
Secondary circuit power frequency withstand voltage (1min)	V	2000
Rated frequency	Hz	50
Rated current	A	630,1250
Rated short-circuit breaking current	kA	20	25	20
Rated peak withstand current	kA	50	63	50
Rated short-circuit making current	kA	50	63	50
4s rated short-time withstand current	kA	20	25	20
Rated short-time withstand current duration	S	4
Rated single/back to back capacitor bank breaking current	A	630/400
Rated capacitor bank making inrush current	kA	12.5(HZ≤1000Hz)
Rated short-circuit current breaking times	Times	30
Mechanical life (isolation switch/circuit breaker/grounding switch)		3000/10000/3000
The accumulative thickness of allowable wear of moving and static contacts	mm	3
Rated closing operating voltage	V	AC24/48/110/220 DC24/48/110/220
Rated opening operating voltage
Rated voltage of energy storage motor	V	AC24/48/110/220 DC24/48/110/220
Rated power of energy storage motor	W	70
Energy storage time	S	≤15
Contact distance	mm	9±1
Overtravel		3.5±1
Contact closing bounce time	ms	＜5
Three-phase opening and closing asynchronous		≤2
Opening time (rated voltage)		≤40
Closing time (rated voltage)		≤60
Average opening speed (contact just opened ~ 6mm)	m/s	0.9~1.3
Average closing speed (6mm~ contact just closed)		0.4-0.8
Contact opening rebound amplitude	mm	≤2
Contact closing contact pressure	N	2400±200( 20-25kA) 3100+200(31.5kA)
Rated operating sequence		O-0.3s-CO-180s-CO

Configuration

Item	Parameter	Note
Energy storage motor	75W	Standard
Closing coil	A(D)C24~220V	Standard
Opening coil	A(D)C24~220V	Standard
Isolation switch auxiliary switch	1Open1Close5A	Standard
Grounding switch auxiliary switch	1Open1Close5A	Standard
Energy storage mechanism auxiliary switch	2Open1Close5A	Standard
Circuit breaker auxiliary Switch	8Open8Close5A	Standard
Anti-trip device	A(D)C24~220V	Standard
Live sensor (inductive)	Non-contact	Standard
Locking device	A(D)C24~220V	Optional
Overcurrent release	3.5A, 5A	Optional
Undervoltage device	A(D)C24~220V	Optional

Applicable cabinet type

It can be assembled in small fixed cabinets, ring network cabinets or box transformers. The main circuit of VEGM-12GD series three- position combined vacuum circuit breaker is arranged longitudinally. The upper part is an isolation switch, the middle part is a vacuum circuit breaker, and the lower part is a grounding switch. Detector mechanism, interlocking mechanism 1 are positioned at switch front, and this switch can be installed upside down.

product-1-1

Dual interlocking: circuit breakers, isolation switches, and grounding switches are equipped with forced mechanical interlocking
operations;
Design antimisoperation locking devices for circuit breakers, isolation switches, and grounding switches;
The isolation switch and grounding switch are operated separately on an independent shaft in steps, and a forced mechanical
interlocking operation is set between the two operations;
After the switch opening and closing operation, please observe and confirm their respective opening and closing states.

1.3
Interlocking of circuit breaker, disconnector, earthing switch and cabinet door
The disconnector and earthing switch are mechanically interlocked with each other. They can only be closed in two ways and cannot be closed at the same time:
The disconnector can only be closed after the earthing switch is opened; the earthing switch cannot be closed after the disconnector is closed.
When the closing lock is in the locked position, the circuit breaker can be closed, and the disconnector and earthing switch cannot be operated.
When the closing lock is in the unlocked position, the circuit breaker cannot be closed, and the disconnector and earthing switch
can be operated.
After the circuit breaker is closed, the closing lock cannot be unlocked, and the disconnector and earthing switch cannot be operated.
The cabinet door can only be opened after the earthing switch is closed.
The earthing switch can only be opened after the cabinet door is closed.

Installation size

1.4

1.5

Contact Us

For inquiries about the VEGM-12GD Indoor High Voltage Three-Station Vacuum Circuit Breaker, please reach out to us through the following channels:pannie@hdswitchgear.com.

We welcome OEM, distributors, and project collaborations. Let us know your requirements, and our team will provide the best solution for your needs.