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VGK-II-12 indoor fixed type vacuum circuit breaker

Model: VGK-II-12

Description

VGK-II-12 series indoor high voltage AC vacuum circuit breaker (vertical rotary isolation type) is an indoor switchgear for 12kV power system. It is used as protection and control unit for power grid equipment and industrial and mining enterprises. The nature of the load and frequent operation, multiple occasions of short-circuit current. The product adopts the new circuit breaker operating mechanism, the vacuum interrupter and the main conductive circuit parts are solidly sealed in one part to protect the arc extinguishing chamber from collision, dust and condensation. The environment adaptability is strong, the operation and maintenance cost is greatly reduced, and the product is realized once. Partially maintenance-free, the operating mechanism is less maintenance; the operating mechanism is integrated with the circuit breaker and the isolating switch.

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Outstanding Features Make You Stand Out

We play extreme caution to quality and utmost attention to detail, which makes our products so perfect.

Modularization of Functional Unit

The main circuit unit and running product are coherent in interchangeability.
Strong Versatility

The operating mechanism can be separated from the whole circuit breaker for convenient and easy maintenance and fix.
Low Maintenance

No need of adjustment of driving unit; long-acting lubricating, reliable corrosion resistance, and high mechanical stability make low maintenance possible.
Long-acting Lubricating

We apply German lubricating grease boasting lower starting torsion, stronger anti-aging and oxidation resistance.
Strong Corrosion Resistance

Utilizing zinc-nickel alloy plating line with a German process to make sure our corrosion resistance is 5 to 7 times stronger than ordinary zinc-plating process.
Strong Expandability

This product can easily realize diverse arrangements and combinations to meet functions like expandability and control.

Product Detail
Technical Parameters
Technical Drawings

The integrated design of the circuit breaker (load switch) and the isolating switch effectively reduces the cabinet space occupied by the functional unit;

The dual-function (isolation, switch) mechanism simplifies the mechanical interlock between the isolating switch and the circuit breaker (load switch) and the door of cabinet, greatly improving product reliability；

The operating mechanism of using coil and torsion spring has no zero death point and high reliability.

No.	Parameters name					Unit	Parameters
							Circuit breaker	Load switch
1	Rated voltage					kV	12
2	Rated current of main busbar					A	630		1250
3	Rated frequency					Hz	50
4	Rated short time withstand current				Main circuit	kA	25	31.5
					Ground circuit		21.7	27.4
5	Rated short-time peak current				Main circuit		63	80
					Ground circuit		54.5	68.5
6	Rated short circuit withstand time				Main circuit	s	4
					Ground circuit		2
7	Rated short circuit closing current (peak)					kA	63	80
8	Rated short circuit breaking current						25	31.5
9	Rated short circuit breaking times					Times	30
10	Rated operation sequence						O-0.3s-CO-180s-CO
11	Mechanical life			Circuit breaker (load switch)		Times	10000
				Three-position switch			5000
12	Rated insulation level	1min power frequency withstand voltage (effective value)			Phase, to ground	kV	42
					Fracture		48
		Lightning impulse withstand voltage (peak)			Phase, to ground		75
					Fracture		85
		Power frequency withstand voltage of secondary circuit				V	2000
13	Contact opening distance					mm	9±1
14	Overtravel						3±0.5
15	Interphase center distance						210±1
16	Closing contact bounce time					ms	≤2
17	Three phase asynchronous of opening						≤2
18	Opening time When the operating voltage is		highest				17～55
			rated
			Minimum
19	Closing time					ms	30～70
20	Average opening speed (first 6mm average)					m/s	1.0～1.8
21	Average closing speed (after 6mm average)						0.8~1.4
22	Main conductive circuit’s resistance					μΩ	≤100
23	Contact pressure					N	3200±150
24	Opening contact’s rebound amplitude					mm	≤2