VTZ-12M Permanent Magnet High-Explosive Cabinet Vacuum Circuit Breaker (Tongzhong Electric Special Model) is a dedicated vacuum circuit breaker for underground mining applications rated at 12kV, 50/60Hz AC. Featuring a permanent magnet mechanism, it offers extended mechanical service life and incorporates built-in mechanical manual closing and tripping functions. In the event of permanent magnet controller failure, these mechanical manual operations enable emergency power supply and shutdown procedures. Suitable for all locations requiring explosion-proof power facilities, the draw-out unit is compatible with various mining-grade high-voltage explosion-proof switchgear 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(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
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	>20000
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 Moved and Fixed Contact	mm	9±1
2	Contact Overtravel	mm	3.5±0.5
3	Average Closing Speed	m/s	0.7±0.2
4	Average Opening Speed (Average Speed of First Opening at 6mm)	m/s	1.1±0.2
5	Rated Contact Pressure	N	2500±200N(25kA) 3100±200N(31.5kA)
6	Closing Time	ms	≤50ms
7	Opening Time	ms	≤50ms
8	Contact Bouncing Duration at Closing Operation	ms	≤2
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

VTZ-12M Permanent Magnet High-Explosive Cabinet Vacuum Circuit Breaker has many advantages:

Circuit Breaker Performance: E2-C2-M2

Simplified Maintenance: Utilizes permanent magnet operating mechanism for extended mechanical service life;

Safety and Reliability: Equipped with manual closing and tripping devices for emergency power supply/disconnection; reliable mechanical interlocking between circuit breaker and cabinet ensures operator safety; electric chassis enables unattended remote operation.

High Conductivity: Rational conductive circuit design meets 1.1 times rated current temperature rise level;

Intelligent Configuration:

a. Optional self-powered wireless temperature monitoring solution for safety and maintenance-free operation;

b. Mechanical characteristic monitoring solution for real-time tracking of circuit breaker operational data, enabling early detection and resolution of potential hazards;

c. Motorized cabinet entry solution for remote operation and personnel safety assurance;

D. Real-time component aging detection for regulatory compliance testing.

Suitable for:

Various types of mining explosion-proof switchgear; new modular high-explosive cabinets;

Product Applications

VTZ-12M Permanent Magnet High-Explosive Cabinet Vacuum Circuit Breaker has many applications:

1. Coal mining industry 2. Metal mining industry

Product Outline Drawing

VTZ-12M Permanent Magnet High-Explosive Cabinet Vacuum Circuit breaker in stock

Product Wiring Diagram

VTZ-12M Permanent Magnet High-Explosive Cabinet Vacuum Circuit Breaker supplier

We can manufacture a wide range of mining vacuum circuit breaker .For more details, please contact us.

why choose us

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.

Advanced manufacturing and production
We operate one of the most advanced and standardized assembly line manufacturing facilities in the industry, equipped with the latest technology, enabling us to produce a wide range of high quality electrical products with precision and efficiency. Wecomply with GB 1984-2024 and GB/T11022-2020 standards to ensure the highest quality. Our commitment to excellence is reflected in the durability, reliability, and compatibility of our products.

Adapting to industry trends
Guided by our strategic development plan, we continuously adapt our products to align with the latest trends in smart grids, power system automation, and high altitude environments. Our leading high-current, high-voltage, and long-life products are designed to meet the rigorous demands of today's power systems, providing our customers with reliable, maintenance-free solutions that stand the test of time.

Wide range of products
We offer a wide range of products, including indoor and outdoor vacuum circuit breakers, switchgear, low voltage switch equipment, and various electrical accessories. Each product is designed to meet the specific needs of our customers, and can operate stably in urban distribution networks, industrial melting, new energy power generation, rural power supply and other places, and can still maintain excellent reliability even in harsh environments.

Hot Tags: vtz-12m permanent magnet high-explosive cabinet vacuum circuit breaker, China vtz-12m permanent magnet high-explosive cabinet vacuum circuit breaker manufacturers, suppliers, factory, VTZ 17 5 Vacuum Circuit Breaker, VTZ CS 12 Vacuum Circuit Breaker with Lateral Operating Mechanism, ZN12 12 Vacuum Circuit Breaker, ZN39 40 5 Vacuum Circuit Breaker, ZN85 40 5 Miniaturized Vacuum Circuit Breaker, ZN85 40 5 Vacuum Circuit Breaker