1.Overview:
VTG-24 indoor high voltage AC vacuum circuit breaker (hereinafter referred to circuit breaker) is used in the three-phase AC 50Hz indoor place with the rated voltage 24kV as the protection and control of the electrical facilities in the industrial mines, enterprises, power plant, and power substation, especially suitable for metallurgy, chemical, and coal industries.
Circuit breaker complies with the GB/T 1984 High Voltage AC Circuit Breaker, GB/T 11022 Common specifications for high-voltage switchgear and controlgear standards, DL/T 402 High Voltage AC Circuit Breaker, and related IEC standards.
The operating mechanism of circuit breaker is of the integrated design type. The operating mechanism and the primary circuit are front and back arranged, and they can be used as fixed installation unit (fixed cabinet) and also form a cart unit (cart cabinet) together with the propulsion mechanism (chassis truck).
2.Technical Parameters:
2.1  Main technical parameters of circuit breaker

No.	Name	Unit	Value
1	Rated voltage	kV	24
2	Rated power frequency withstand voltage (1 minute)		65
3	Rated lighting impulse withstand voltage (peak)		125
4	Rated frequency	Hz	50
5	Rated current	A	630 1250	630 1250 1600 2000 2500 3150		1250 1600 2000 2500 3150
6	Rated short-circuit breaking current	kA	20 、25	31.5		40
7	Rated short-circuit making current (peak)		50 、63	80		100
8	Rated short-time withstand current		20 、25	31.5		40
9	Rated peak withstand current		50 、63	80		100
10	Rated short-circuit duration	s	4
11	Rated operation sequence		O-0.3s-CO-180s-CO		O-180s-CO-180s-CO
12	Rated short-circuit breaking current ON/OFF times	Times	50		30
13	Mechanical life		10,000/customized
14	Rated operating voltage	V	220/110
15	Allowable cumulative wear thickness of moving and fixed contacts	mm	3

No.	Name	Unit	Value
1	Clearance between open contacts	mm	13±1
2	Overtravel		4±1
3	Contact closing bounce time	ms	1600Aand below ≤ 2, 2000Aand above ≤ 3
4	Three-phase closing and opening synchronization		≤ 2
5	Average opening speed	m/s	1.4±0.2
6	Average closing speed		0.8±0.2
7	Closing time	ms	30 ~ 70
8	Opening time		20 ~ 50
9	Main circuit resistance	μΩ	630A ≤ 65,1250A ≤ 60 1600A ~ 2000A ≤ 55 2500Aand above ≤ 45
10	Contact pressure of closing contact	N	20kA, 25kA:2500±1300 31.5kA: 3200±300 40kA: 4500±300

2.3 Technical data of energy storage motor
This product has a permanent magnet single-phase DC motor equipped with a special reducer. The technical parameters of the motor are listed in table below.

Rated voltage (V)	Rated output power (W)	Normal operating voltage range	Energy storage time at rated voltage (S)
DC220	70	85% to 110% of rated voltage	≤ 15

	Closing coil	Opening coil	Locking coil
Rated operating voltage (V)	DC220	DC220	DC220
Coil Power (W)	368	368	4
Resistance (Ω)	131.5±5% (20℃)	131.5±5% (20℃)	13600±5%(20℃)
Working voltage range	85% to 110% of rated voltage	65% to 120% of rated voltage	85% to 110% of rated voltage

3.Operating Conditions:
3.1 Normal Working Conditions
3.1.1 Ambient temperature: The max. temperature is +40℃, and the min. temperature is -15℃ (storage and transport at -30℃ are allowed);
3.1.2 Environmental humidity: The daily mean relative humidity is ≤ 95%, the monthly mean relative
humidity is ≤ 90%; the daily mean vapor pressure is ≤ 2.2 x 10 – 3MPa, and the monthly mean vapor pressure is ≤ 1.8 x 10 – 3 MPa;
3.1.3 The altitude does not exceed 1000m (customization is required if greater than 1000m);
3.1.4 The earthquake intensity does not exceed 8 degrees;
3.1.5 There is no water drops, no flammable materials, no chemical corrosive gas and no severe vibration at the site.
3.2 If the normal working conditions are not met, please contact the manufacturing unit.
4.Features:
4.1  Excellent overall performance of circuit breaker
4.1.1 The arc extinguish chamber and operating mechanism of circuit breaker are configured at front and rear, and are connected as a whole structure through the transmission mechanism;
4.1.2 The mechanical life is up to 10,000 times and above.
4.2  The advanced vacuum arc extinguish chamber uses copper-chromium alloy contact and longitudinal magnetic field contact structure
4.3  Integrally cast solid-sealed poles
4.3.1 The solid-sealed pole is formed with new APG process;
4.3.2 The vacuum arc extinguish chamber is solid-sealed in the pole to effectively prevent damage and surface contamination due to other objects, and to significantly reduce the overall size of circuit breaker.
4.4  Flexible and simple operating mechanism
4.4.1 The operating mechanism is of the spring energy storage type with electric and manual energy storage functions;
4.4.2 During the operation of circuit breaker, the energy of the energy storage spring is transferred to the link gear through output cam, and then to the moving contact part through the link gear;
4.4.3 With advanced and reasonable damping device, the opening rebound force is small.
4.4.4 No adjustment is required with very little maintenance.
5.Outline and Installation Dimensions:
5.1  Outline and installation dimensions of handcart-type circuit breaker

Note: The stroke of the handcart is 300±2mm.

Rated current (A)	630	1250	1600
Rated short-circuit breaking current (kA)	20, 25	25/31.5/40	31.5/40
Size of matching fixed contact (mm)	φ35	φ49	φ55

5.2  Outline and installation dimensions of handcart-type circuit breaker

Note: The stroke of the handcart is 300mm.

Rated current (A)	1600, 2000	2500, 3150	4000
Rated short-circuit breaking current (kA)	31.5/40		40
Size of matching fixed contact (mm)	φ79	φ109

5.3  Outline and installation dimensions of fixed circuit breaker

 

Rated current (A)	630	1250	1600
Rated short-circuit breaking current (kA)	20, 25	25/31.5/40	31.5/40
Mechanism top interlock L1 (mm)	The interlock has left extension and right extension (left extention 50 as standard configuration), the length can be customized according to customer requirements
Spindle extension L2 (mm)	Left extension or right extension (no extension as standard configuration), the length can be customized according to customer requirements

5.4  Outline and installation dimensions of fixed circuit breaker

Note: Forced air-cooled is required for 4000A.

Rated current (A)	1600, 2000	2500, 3150	4000
Rated short-circuit breaking current (kA)	31.5/40		40
Size of matching fixed contact (mm)	φ79	φ109
Mechanism top interlock L1 (mm)	The interlock has left extension and right extension (left extension 50 as standard configuration),  the length can be customized according to customer requirements
Spindle extension L2 (mm)	Left extension or right extension (no extension as standard configuration), the length can be customized according to customer requirements

6.Electrical Schematic Diagram:
6.1 Secondary Schematic Diagram for Fixed Type


6.2  Secondary Schematic Diagram for Handcart Type