VTZ-12CL series indoor fault fast-cutting vacuum circuit breaker (a special model for Tongzhong Electric) is an indoor switchgear designed for use with a rated voltage of 12kV and an AC 50/60Hz.

It adopts a specially designed combination of a permanent magnet operating mechanism and a repulsion mechanism. Under normal operating conditions, the permanent magnet operating mechanism performs the regular closing and opening operations of the circuit breaker, ensuring stable and reliable operation. When a fault current occurs, the power system detects and controls the fault condition, triggering the repulsion mechanism to rapidly open the circuit breaker and quickly interrupt the fault current, thereby providing effective protection for the power system and minimizing the impact of electrical faults.

The product is suitable for a wide range of industrial and mining enterprises, as well as power grid applications and related electrical equipment. The withdrawable trolley unit is designed for use with KYN28A-12 switchgear, providing convenient installation and operation. It can also be configured as a fixed unit with the corresponding mechanical interlocking device for fixed-type switchgear, such as XGN2 cabinets, to meet different installation and application requirements.

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
4	Rated power-frequency withstand voltage	kV	48(Across the contact gaps ) /42(To ground )
5	Rated lightning impulse withstand voltage	kV	75
6	Rated short-circuit breaking current	kA	25/31.5
7	Rated-short-circuit making current (peak)	kA	63/80
8	Rated withstand current (peak)	kA	63/80
9	Rated duration of short circuit	s	4
10	Operating cycles at rated short-circuit breaking current	Times	E2
11	Mechanical endurance	Times	10000
12	Standard Operating sequence	-	O-0.3s-CO-180s-CO
13	All0wable wearing thickness of contacts	mm	≤3

Mechanical Characteristics

No.	Name	Unit	Data
1	Clearance between open contacts	mm	9±1
2	Over-travel	mm	3±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	1.4±0.2
5	Rated added external contact final force	N	2500±200N(25kA) 3100±200N(31.5kA)
6	Opening time	ms	10-30
7	closing time	ms	≤5
8	Contact bouncing duration at closing operation	ms	≤2
9	Closing/opening no-simultaneity of 3-phase contacts	ms	≤2

Product Advantages

VTZ-12CL series indoor fault fast-cutting vacuum circuit breaker has many advantages:

Performance of circuit breaker:

E2-C2-M2

Reliable Structure:

The permanent magnet mechanism and repulsion mechanism are integrated into one, with three independent phases. Normal closing and opening operations utilize the permanent magnet mechanism. In the event of a fault current, the repulsion mechanism is activated, separating the moving and static contacts within 5ms.

High conductivity:

A well-designed conductive circuit meets a temperature rise requirement of 1.1 times the rated current.

High Compatibility:

This product is identical in dimensions to conventional KYN28-12 series cabinet switches, eliminating the need for specialized cabinet design and making it suitable for a variety of power conversion environments.

Products Application

VTZ-12CL series indoor fault fast-cutting vacuum circuit breaker has many applications :

Ⅰ

Power plant

Ⅱ

Industrial field (chemical, steel, petroleum, coal, etc.)

Ⅲ

Power grid system and Power infrastructure

overall outline drawing

VTZ-12CL series indoor fault fast-cutting vacuum circuit breaker price

Product Wiring Diagram

VTZ-12CL series indoor fault fast-cutting vacuum circuit breaker are custom products, and the secondary wiring configuration must be determined based on the user's environment.

Shaanxi West Power Tongzhong Electrical Co., Ltd. is a leading manufacturer with over 20 years of experience, specializing in high-quality 7 to 40.5kV vacuum circuit breakers, switchgears, and a wide range of electrical products. With advanced manufacturing processes, strict quality control, and professional production facilities, we are committed to providing reliable, durable, and efficient electrical solutions for a variety of power and industrial applications.

Our VTZ series vacuum circuit breakers feature high reliability, excellent switching performance, and long service life, with maintenance-free operation for up to 20 years. They are widely suitable for power distribution systems, industrial and mining enterprises, substations, and other medium-voltage applications.

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Products

VTZ-12CL Series Indoor Fault Fast-cutting Vacuum Circuit Breaker

Product Specifications

Product Advantages

Products Application

overall outline drawing

Product Wiring Diagram