ZND-12 Permanent Magnetic Operating Mechanism Vacuum Circuit Breaker is used for rated voltage of 12kV and AC 50/60Hz. It adopts a permanent magnet operating mechanism, with a compact design. It can be used to switch various types of electrical loads and is widely applied in power grid construction and product modification projects for urban and rural power grids, especially in locations requiring frequent operations.

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 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	>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	8.5±0.3
2	Contact Overtravel	mm	2.5±0.5
3	Average Closing Speed	m/s	0.8±0.2
4	Average Opening Speed (Average Speed of First Opening at 6mm)	m/s	1.2±0.2
5	Rated Contact Pressure	N	2200±200N(25kA) 3000±200N(31.5kA)
6	Closing Time	ms	≤40
7	Opening Time	ms	≤30
8	Contact Bouncing Duration at Closing Operation	ms	≤2
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2
10	Distance Between Phases	mm	180/200/210/230/250/275/300

Product Advantages

ZND-12 Permanent Magnetic Operating Mechanism Vacuum Circuit Breaker has many advantages:

Circuit Breaker Performance: E2-C2-M2

Long Service Life: Features a permanent magnet operating mechanism, ensuring maintenance-free operation throughout its service life.

High Reliability: The permanent magnet mechanism, with fewer components, offers high reliability.

High Conductivity: The optimized conductive circuit design meets the temperature rise limit of 1.1 times the rated current.

Fast Opening Speed: Equipped with a quick-opening function for rapid circuit interruption.

Wide Applicability: The compact size allows the product to be used in various environments, including retrofitting of older equipment.

Product Applications

ZND-12 Permanent Magnetic Operating Mechanism Vacuum Circuit Breaker has many applications:

1. Replacement of Teriad ISM products.

2. Power grid construction.

3. Product modification for various applications.

Product Outline Drawing

ZND-12 Permanent Magnetic Operating Mechanism Vacuum Circuit Breaker outline drawing

630A Dimension Drawing with 200mm Distance Between Phases

ZND-12 Permanent Magnetic Operating Mechanism Vacuum Circuit Breaker outline drawing 1250A

1250A Dimension Drawing with 210mm Distance Between Phases

Note: The above dimensions are for example only. Please communicate with the salesperson for the specific dimensions.

Secondary Wiring Diagram

ZND-12 Permanent Magnetic Operating Mechanism Vacuum Circuit Breaker diagram

Circuit Breaker Body Terminal Definition Diagram

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.

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