VTZ-17.5 Vacuum Circuit Breaker(Tongzhong Electric special model) is used for rated voltage 17.5kV, AC 50/60Hz indoor switchgear, modular operating mechanism, suitable for a variety of industrial and mining enterprises, power grid equipment, handcar unit and KYN28A-17.5 switchgear supporting use, can also be used as a fixed unit and matched with the corresponding mechanical chain. Suitable for fixed cabinets such as XGN2.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50/60
3	Rated Current	A	630/1250/1600/2000/2500/3150/4000/5000
4	Rated PowerFrequency Withstand Voltage	kV	48(Common Value) / 42(Across the Isolating Distance)
5	Rated Lightning Impulse Withstand Voltage	kV	75(Common Value) / 85(Across the Isolating Distance)
6	Rated Short-Circuit Breaking Current	kA	25/31.5/40/50
7	Rated Short-Circuit Making Current (Peak)	kA	63/80/100/125
8	Rated Withstand Current (Peak)	kA	63/80/100/125
9	Rated Duration of Short-Circuit	s	4
10	Operating Cycles at Rated Short-Circuit Breaking Current	Times	E2
11	Mechanical Endurance	Times	30000
12	Standard Operating Sequence	-	O-0.3s-CO-180s-CO
13	Allowable Wear Thickness of Contact	mm	≤3

Mechanical Characteristics

No.	Name	Unit	Data
1	Clearance between open contacts	mm	9±1
2	Over-travel	mm	3.5±0.5
3	Average closing speed	m/s	0.7±0.2
4	Average opening speed(average speed at 6mm of initial opening)	m/s	1.1±0.2
5	Rated added external contact final force	N	2500±200N(25kA) 3100±200N(31.5kA) 4800±300N(40kA) 6000±500N(50kA)
6	Make time	ms	30～70
7	Breaking time	ms	20～50
8	Contact bouncing duration at closing operation	ms	≤2
9	Closing/opening no-simultaneity of 3-phase contacts	ms	≤2

Product Advantages

VTZ-17.5 Vacuum Circuit Breaker has many advantages:

Performance of circuit breaker：

E2-C2-M2

Simple and convenient maintenance:

the use of modular mechanism, the replacement of the opening and closing coils do not need to dismantle the rest of the components, the user can be easily replaced, and no need to test and adjust after the replacement, so that the later operation and maintenance is more convenient.

High conductivity:

reasonable design of the conductive circuit to meet the 1.1 times the rated current temperature rise level.

Wide range of use:

the serialized products cover a wide range, from rated current 630A to rated current 5000A, from rated breaking current 20KA to 50kA comprehensive coverage; cover all environments within 4500 meters above sea level; cover the use of the environment of -40 ℃ ~ 40 ℃.

Support intelligent customization::

a. It can add a wireless temperature monitoring solution with self-powered design to ensure safety and maintenance-free operation.

b. It has a mechanical characteristics monitoring solution to provide real-time monitoring of circuit breaker operating data for early detection and resolution of potential problems.

c. It has a motorized cabinet entry solution to allow remote operation for ensuring personal safety.

d. Real-time component aging can be detected by partial discharge testing.