• Vacuum Circuit Breaker (Circuit Breaker for 12-40.5kV Power Distribution System)
• Vacuum Circuit Breaker (TZN1 Indoor High Voltage Circuit Breaker)
• Vacuum Circuit Breaker (TZN2 Indoor High Voltage Circuit Breaker)
• Vacuum Circuit Breaker Parts (GL2 Indoor High Voltage Insulating Trucks)
• Load Break Switch (Switch for 12-24kV Power Distribution System)
• Load Break Switch (FLN36-12 SF6 Gas Insulated Load Break Switch)
• Load Break Switch (FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)
• Earthing Switch (Switch for 12-40.5kV Power Distribution System)
• Earthing Switch (JN15 Indoor High Voltage Earthing Switch)
• Earthing Switch (EK6 Indoor High Voltage Earthing Switch)
• Disconnector (Disconnect Switch for 12kV Power Distribution System)
• Disconnector (GN30-12 Indoor High Voltage Disconnect Switch)
• Disconnector (GN19-12 Indoor High Voltage Disconnect Switch)
• Switchgear and Enclosure
• Medium Voltage Switchgear (Air Insulated Switchgear for Primary Distribution System)
• Medium Voltage Switchgear (Air Insulated Switchgear for Secondary Distribution System)
• Circuit Breaker and Switchgear Accessories
• Electrical Contacts
• Electrical Conductor
• High Voltage Insulating Components
• Racking Mechanism
• Interlock Mechanism
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Home » Products » Vacuum Circuit Breaker (Circuit Breaker for 12-40.5kV Power Distribution System) » Vacuum Circuit Breaker (TZN2 Indoor High Voltage Circuit Breaker)

Vacuum Circuit Breaker (TZN2 Indoor High Voltage Circuit Breaker)

TZN2 Series Vacuum Circuit Breakers

Introduction
A circuit breaker (CB) is a switching device designed to protect electrical circuits from damage caused by overload or short circuit. Our TZN2 series vacuum circuit breaker (VCB)is the latest domestic achievement. It is available in many varieties, excellent in performance, and widely applicable to:
a. energy and infrastructure: power plants, 220KV/110KV substations, primary and secondary distribution systems.
b. industrial production: power supply systems for pulp and paper, construction materials (glass, cement, ceramics), steel and metal products, aluminum, petrochemical and other industrial productions.
c. building:power supply system of large-, medium-sized buildings and residential areas.
d. other: petrochemical, transportation, and mining areas

Complete Series
Rated voltage: 10kV (12kV), 20kV (24kV), 36kV (40.5kV)
Rated current: 630A, 1250A,1600A, 2000A, 2500A, 3150A,4000A,
Rated short circuit breaking current: 20kA, 25kA, 31.5kA, 40kA

Technology Leader
The TZN2 indoor high voltage circuit breaker adopts the latest domestic vacuum interrupter, which boasts the high-quality copper chrome contacts and the advanced operating mechanism made by optimized longitudinal magnetic field breaking technology. It ensures the excellent electrical characteristics of the VCB.

Vacuum interrupter:
	1. movable conductive rod 2. guide sleeve 3. bellow 4.movable cover plate 5. bellow shield 6. porcelain shell 7. shield tube 8. contact system 9. static conductive rod 10. static cover plate

Flexible Configuration
The operating mechanism of the indoor high voltage circuit breaker is of positive arrangement, allowing fixed and withdrawable mounting methods as well as manual and electric drive methods. The mechanism is suitable for ABB-UniGear, SIEMENS-NXAIR, SCHNEIDER-NVNEX and TELLHOW-KYN28A series medium voltage switchgears.

Safe and Reliable
The spring mechanism of the vacuum circuit breaker is of modular design and simple working principle. The structure is compact with less transmission parts, so that movements are stable and reliable, mechanical life is prolonged, and maintenance will not be frequency asked for. The complete electrical and mechanical interlock ensures the operator’s safety during the operation and maintenance of medium voltage switchgear.

Superior Quality
TZN2 series vacuum circuit breakers all should pass rigorous routine tests. Parts and their suppliers are required in accordance with the latest domestic supplier quality management system (SQM) to pass periodic assessment to ensure quality consistency. Our designing, manufacturing, mounting, and servicing comply with rules of ISO 9001: 2000 quality management system.

Environmentally Friendly
The design of the TZN2 series vacuum circuit breaker is based on European environmental standards, in full compliance with requirements of ISO14001 environmental management system. Our waste parts recycling rate reaches 80%.

Technical Parameters
TZN2 Series Vacuum Circuit Breaker Technology Parameters

Rated voltage	Ur [kV]	12				24			40.5
Rated insulation voltage	Us [kV]	12				24			40.5
Frequency withstand voltage	Ud (1min)[kV]	42				79			95
Lightning impulse withstand voltage	Up [kV]	75				145			185
Rated frequency	Fr [Hz]	50-60				50-60			50-60
Rated current	Ir [A]	630, 1250	630, 1250	630, 1250, 1600 2000, 2500, 3150 4000	1250, 1600, 2000 2500, 3150, 4000	630, 1250	630, 1250	630, 1250, 1600 2000, 2500,3150	630, 1250	630, 1250	630, 1250, 1600 2000, 2500,3150
Rated breaking capacity	Isc [kA]	20	25	31.5	40	20	25	31.5	20	25	31.5
Rated short time withstand current (4 seconds)	Ik [kA]	20	25	31.5	40	20	25	31.5	20	25	31.5
Closing capacity	Ip [kA]	50	63	80	100	50	63	80	50	63	80
Order of operations	[O-0.3s-CO-180s-CO]	■	■	■	─	■	■	■	■	■	■
	[O-180s-CO-180s-CO]	─	─	─	■	─	─	─	─	─	─
Opening time	[ms]	≤ 50				≤ 50			≤ 50
Arcing time	[ms]	≤ 15				≤ 15			≤ 15
Breaking time	[ms]	≤ 70				≤ 70			≤ 70
Closing operation rated voltage	[V]	AC/DC 110/220/230/48/24				AC/DC 110/220/230/48/24			AC/DC 110/220/230/48/24
Opening operation rated voltage	[V]	AC/DC 110/220/230/48/24				AC/DC 110/220/230/48/24			AC/DC 110/220/230/48/24
Charging motor rated voltage	[V]	AC/DC 110/220/230/48/24				AC/DC 110/220/230/48/24			AC/DC 110/220/230/48/24
Charging motor rated power	[W]	70		70, 120		70		70, 120	70		70, 120
Energy storage time	[s]	≤ 15				≤ 15			≤ 15
Mechanical life	[ times ]	30,000		30,000		20,000			20,000
Auxiliary switch	NO+NC	4NO+4NC, 7NO+7NC (Max.10NO+10NC)				4NO+4NC, 7NO+7NC (Max.10NO+10NC)			4NO+4NC, 7NO+7NC (Max.10NO+10NC)
Secondary circuit power frequency withstand voltage (1min)	[V]	2,000				2,000			2,000
Short circuit current breaking times	[ times ]	274				274			274
Rated short time current duration	[s]	4				4			4
Breaker grading	[ms]	M2-E2-C2				M2-E2-C2			M2-E2-C2

Dimensions
12kV Withdrawable Vacuum Circuit Breaker Dimensions

Switchgear Width (mm )	800	800	800	1000	1000	1000	1000	1000
Rated current (A)	630	1250	1600	630	1250	1600	2000	2500-4000
Rated short circuit breaking current (KA)	25-31.5	25-40	31.5-40	25-31.5	25-40	31.5-40	31.5-40	31.5-40
Pole-center distance (mm)	210	210	210	275	275	275	275	275
A	638	638	638	838	838	838	838	838
B	277	277	277	377	377	377	377	377
C	640	640	640	840	840	840	840	840
D	652	652	652	852	852	852	852	852
E	681	681	681	881	881	881	881	881
F	515	515	515	515	515	660	660	720
G	280	280	280	280	280	385	385	385
H	275	275	275	275	275	310	310	310
I	Ф35	Ф49	Ф55	Ф35	Ф49	Ф55	Ф79	Ф109
J	508	508	508	508	508	536	536	536
K	40	40	40	40	40	0	0	0
L	89	89	89	89	89	89	89	89
M	78	78	78	78	78	88	88	88
N	76	76	76	76	76	77	77	77
P	182	182	182	182	182	170	170	170
Q	433	433	433	433	433	361	361	361
R	598	598	598	598	598	586	586	586
S	637	637	637	637	637	698	698	735

12kV Fixed Vacuum Circuit Breaker Dimensions

Switchgear Width (mm )	Rated current (A)	Rated short circuit breaking current (KA)	P	A	B	C	D	E	F	G	H	J	K
800	630	25-31.5	210	520		588	111	275	580	237	275	428	445
800	1250	25-40	210	520		588	111	275	580	237	275	428	445
800	1600	31.5-40	210	520		588	111	275	580	237	275	428	445
1000	630	25-31.5	275	650	700	770	111	275	580	237	275	428	445
1000	1250	25-40	275	650	700	770	111	275	580	237	275	428	445
1000	1600	31.5-40	275	650	700	770	111	275	632	252	275	428	445
1000	2000	31.5-40	275	650	700	770	111	275	632	252	275	428	445
1000	2500-4000	31.5-40	275	650	700	770	111	275	632	252	275	428	445

24kV Withdrawable Vacuum Circuit Breaker Dimensions

Rated operating current (A)	Rated breaking current (KA)	Static contact size (mm)	Dimension data (mm)
630 1250	25 31.5	Ф 35 Ф 49	P	A	B	C	H	K	S
			210	638	652	640	770	681	277
			275	838	852	840	815	881	377

Rated operating current (A)	Rated breaking current (KA)	Static contact size (mm)	Dimension data (mm)
1600 2000 2500 3150	25 31.5	Ф 55 Ф 79 Ф 109 Ф 109	P	A	B	C	H	K	S
			275	838	852	840	815	881	377

24kV Fixed Vacuum Circuit Breaker Dimensions

Rated operating current (A)	Rated breaking current (KA)	Static contact size (mm)	Dimension data (mm)
630 1250	25 31.5	——	P	A	B	C
			210	520	——	588
			275	650	700	770

Rated operating current (A)	Rated breaking current (KA)	Static contact size (mm)	Dimension data (mm)
1600 2000 2500 3150	25 31.5	——	P	A	B	C
			275	650	700	770

40.5kV Withdrawable Vacuum Circuit Breaker Dimensions

Rated operating current (A)	Rated breaking current (KA)	Static contact size (mm)
1600 2000 2500 3150	25 31.5	Ф 35 Ф 49 Ф 55 Ф 79

Structure
A: air plug
B: panel
C: chassis
D: contact
F: contact arm + contact arm sleeve
G: bending plate A: circuit breaker auxiliary contact
B: motor
C: PCB
E: operation counter
F: trip coil OPEN, undervoltage shunt trip, second trip coil OPEN
G: latching solenoid
H: trip coil CLOSE
I: energy storage instruction
J: points closing instructions
K: charging handle insertion hole Configuration Details
1. Basic configuration

Closing / Opening Coils TQ,HQ	Counter	Auxiliary Switch QF	Drive Device
Microswitch S1-S3	Charging Motor M1	Electromagnetic Lock Y1	Terminal blocks for CB Truck	PCB

2. Option configuration

a. withdrawable latching solenoid (RL2)
The function is to prevent the withdrawable circuit breaker from being drawn into switchgear in the case of being connected with secondary circuit air outlet. For the secondary air outlet, matching proper pin matrix with different currents can prevent circuit breaker with wrong rated current from being drawn into switchgear.

b. secondary shunt opening release (MO2)
The opening release allows another set of independent secondary power supply, and allows remote opening control.

c. shunt opening release (MO1)
This allows remote opening control of the apparatus. The release can operate both in direct and alternating current.

d. opening solenoid (MO3)
The opening solenoid is a special demagnetization release, mounted on the right side of the mechanism, and the input control device is installed on the switchgear.

e. shunt closing release (TQ2)
The shunt closing release enables remote control over circuit breaker closing. AC and DC power supply are both workable for the operation. The continuous closing command applied to the closing release can achieve anti-skip function. This electrical characteristic is consistent with the performance of shunt opening release.

f. undervoltage and no-voltage device (MU)
When the secondary control power supply voltage falls below 65% or the power is off, the device will automatically opening the circuit breaker. The release cannot be used as spare opening release.

g. sliding contact (-S4)
Instantaneous sliding contact sends signals temporarily when the circuit breaker is opening. No signal is sent in the case of manual tripping, and mechanical interlock will act on the switches at two positions. In the case of electric opening, mechanical interlock usually acts on switches at frequent opening positions only.

Service Conditions
Normal service condition	indoor
Ambient temperature	-15 ℃ ~ +40 ℃
Altitude	*1000m
Humidity
Daily average	≤ 95%
Monthly average	≤ 90%
Earthquake intensity	≤ 8 grade

For other requirements, please contact us.

Standard Compliance
IEC 62271-100	High Voltage AC Circuit Breakers
IEC 60694	Common Specification for High Voltage Switchgear and Control Gear Standards
GB1984-2003	High Voltage AC Circuit Breakers
GB/T11022-1999	Common Technical Requirements for HV Switchgear
DL/T 402-1999	Technical Specification for HV AC Circuit Breaker
DL/T 403-2000	Technical Specification for12kV- 40.5kV indoor HV AC Circuit Breaker
DL/T 593-2006	Common Specification for HV Switchgear Enquiry and Orders
JB/T 3855-1996	Technical Specification for 3.6kV- 40.5kV indoor HV AC Circuit Breaker

Type Tests
a. dielectric strength test
b. temperature rise test
c. breaking capacity test
d. dynamic thermal stability test
e. mechanical life test
f. electrical life test
g. mechanical life curve

Special Tests
transport and storage test

Quality Control System
In the production process, each circuit breaker is manufactured with advanced processing technology and subjected to routine tests. This is to ensure good quality and consistency before delivery,in line with the requirements of ISO 9001:2000 quality management system. The test reports are signed by our quality control department to ensure the traceability.

The following items will go through our rigorous systematic routine tests:
a. 1 min power frequency withstand voltage test on main circuit: between open contacts, phase-to-phase, phase to earth
b. VCB mechanism operating low voltage test
c. dielectric test in auxiliary and control circuit
d. mechanical characteristic test
e. circuit resistance test
f. contact simultaneity test
g. opening and closing time
h. bouncing time
i. out-looking check

Model Description

TZN2	12		630		25		210	D
Breaker name	Rated voltage		Rated operating current		Rated short-circuit breaking current		Pole-center distance	Breaker type
	12	12KV	630	630A	25	25KA	210MM	D Withdrawable type
	24	24KV	1250	1250A	31	31.5KA	275MM	F Fixed type
	40.5	40.5KV	1600	1600A	40	40KA		K Floor type
			2000	2000A
			2500	2500A
			3150	3150A
			4000	4000A

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