Product Introduction

VTZ-12GD-MT vacuum circuit breaker combination electrical appliance is a special vacuum circuit breaker for underground mining with rated voltage of 12kV and AC 50/60Hz. It adopts permanent magnet mechanism and has mechanical manual closing and opening functions. It is suitable for various places with explosion-proof requirements for power facilities. The trolley unit is used in conjunction with PJG9-10 switch cabinet.

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.

Excellence in Research and Development
Innovation is at the core of our business. We have independently developed the VTZ Series Vacuum Circuit Breakers and continue to invest in research and development to meet the evolving needs of the electrical industry. Our R&D team consists of senior technical experts with decades of experience in the design and manufacture of high and low voltage electrical equipment. Their expertise, combined with our advanced facilities, allows us to stay ahead of industry trends and continually optimize our product offerings.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50/60
3	Rated current	A	1250
4	Rated power-frequency withstand voltage	kV	48(Across the contact gaps ) /42(TO Ground)
5	Rated lighting impulse withstand voltage	kV	75
6	Rated short-circuit breaking current	kA	31.5
7	Rated-short-circuit making current (peak)	kA	80
8	Rated withstand current (peak)	kA	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.	Parameter name	Unit	Data
1	Contact opening distance	mm	9±1
2	Contact travel	mm	3 ±0.5
3	Center distance between poles	mm	150±1.5
4	Allowed wear thickness of moved and fixed contact	mm	3
5	average clsing speed	m/s	0.6±0.2
6	Average opening speed (average speed of first opening at 6mm)	m/s	1.1±0.2
7	Rated current pressure	N	2500±100/ 3100±200
8	Closing bounce	ms	£2
9	Closing and opening are out of phase	ms	£2
10	Closing time	ms	30～70ms
11	Opening time	ms	20～50ms
12	Isolation closing and opening action time	s	£40
13	Earthing closing and opening action time	s	£40
14	Main circuit resistance (after closing the circuit breaker and arc extinguishing chamber)	mW	≤130
15	Energy storage power supply	V	DC110V(Voltage stabilization)
16	Opening and closing circuits	Passive shorting contacts

Product Advantages

VTZ-12GD-MT vacuum circuit breaker combination electrical appliance has many advantages:

Circuit breaker performance:

E2-C2-M2

Safe and reliable:

It adopts a combination of permanent magnet mechanism + spring mechanism, and the permanent magnet mechanism is used for normal operation; when the permanent magnet mechanism fails, the manual closing and opening operations are safe and reliable. The circuit breaker and the cabinet can achieve reliable mechanical interlocking to ensure the safety of the operator.

3. High conductivity:

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

4. Highly integrated and intelligent configuration:

a. Wireless temperature intelligent monitoring solution can be added for self-power design, which is safe and maintenance-free;

b. The combined electrical appliance is equipped with an electrically operated isolating switch and grounding switch, which does not require external equipment and supports one-button sequential control

operation;

c.Manual cart, instead of fixed installation, is easy to maintain