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.

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.

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%.

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.

For other requirements, please contact us.

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