VTZ-12KF Fast Vacuum Circuit Breaker (Tongzhong Electric special model) is an indoor switchgear for rated voltage 12kV, AC 50/60Hz. It adopts modular operating mechanism and is suitable for various industrial and mining enterprises and power grid equipment. The trolley unit is used in conjunction with the KYN28A-12 switch cabinet. It can also be used as a fixed unit and equipped with corresponding mechanical interlocking for XGN2 and other fixed cabinets.

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	3.5±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	1.4±0.2
5	Rated added external contact final force	N	2500±200N(25kA) 3100±200N(31.5kA)
6	Make time	ms	15～35
7	Breaking time	ms	≤10
8	Contact bouncing duration at closing operation	ms	≤2
9	Closing/opening no-simultaneity of 3-phase contacts	ms	≤2

Product Advantages

VTZ-12KF Fast Vacuum Circuit Breaker has many advantages:

Performance of circuit breaker:

E2-C2-M2

High adaptability:

This product is completely consistent with the cabinet switch size of the conventional KYN28-12 series, and does not require special cabinet design, which is suitable for a variety of occasions for transforming the power environment.

High conductivity:

Reasonable conductive circuit design, meeting the temperature rise level of 1.1 times the rated current;

Simple and reliable structure:

permanent magnet mechanism, three-phase independent design;

Products Application

VTZ-12KF Fast 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-12KF Fast Vacuum Circuit Breaker in stock

Note: VTZ-12KF fast vacuum circuit breakers are custom-made products. The secondary wiring method needs to be determined based on the user's operating 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. Our advanced manufacturing process ensures reliable, durable solutions, especially our VTZ series vacuum circuit breakers, which are maintenance-free for up to 20 years. With a team of expert technicians, we excel in R&D, manufacturing, and after-sales service for both high and low voltage equipment, delivering excellence at every stage.

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