ZW32-12M Permanent Magnetic Vacuum Circuit Breaker producede by Shaanxi West Power Tongzhong Electrical Co., Ltd. is an outdoor distribution device with a rated voltage of 12kV and a three-phase AC frequency of 50Hz. It is widely used in urban and rural power grids as a disconnecting or linking switch, or for outdoor substation outlet switches in rural power distribution systems. It is capable of efficiently performing the traditional recloser function, and can open/close load and fault currents.

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.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50
3	Rated Current	A	630/1250
4	Rated Power Frequency Withstand Voltage	kV	34(Wet Test) / 42(Dry Test)
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	60000
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	2±0.5
3	Average Closing Speed	m/s	0.6±0.2
4	Average Opening Speed (Average Speed of First Opening at 6mm)	m/s	1.0±0.2
5	Rated Contact Pressure	N	2000±200N(25kA/31.5kA)
6	Closing Time	ms	30~70
7	Opening Time	ms	20~50
8	Contact Bouncing Duration at Closing Operation	ms	≤3
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

ZW32-12M Permanent Magnetic Vacuum Circuit Breaker has many advantages:

Simple Structure: Features a newly designed permanent magnet operating mechanism, further reducing mechanical components.

High Reliability: The controller integrates a "anti-pumping" function, which effectively distinguishes fault currents and closing inrush currents, ensuring accurate protection.

Long Service Life: The use of a permanent magnet operating mechanism enhances the mechanical reliability of the breaker, resulting in a significant increase in the overall mechanical lifespan of the entire unit, including the arc-extinguishing chamber, with a service life of up to 60,000 operations.

Advanced Control Technology: Standard features include a wireless remote control (30m range), as well as manual operation. The controller is equipped with a standard communication interface, and with the addition of a wireless data communication module, it enables easy networking and supports "Four Remote" functions (remote control, remote signaling, remote measurement, and remote adjustment).

Powerful Functions: The system can be easily expanded to function as a recloser or sectionalizer, distinguishing between permanent and temporary faults. Additionally, the permanent magnet controller can be customized to meet various networking, protection, and operational requirements as specified by the customer.

Low Operating Power: The permanent magnet operating mechanism, combined with long-life batteries, allows the breaker to draw power directly from the CT (current transformer). The breaker can also be upgraded into a recloser or sectionalizer, significantly increasing the power quality of the grid. With an average daily load rate of 20% for 6 hours, the energy balance between the controller and battery is maintained, allowing the breaker to operate long-term without needing an external control power source.