ZW32-12M 12kV Outdoor Medium Voltage Permanent Magnetic Vacuum Circuit Breaker, produced by Shaanxi West Power Tongzhong Electrical Co., Ltd., is an outdoor medium-voltage distribution device designed for a rated voltage of 12kV and a three-phase AC frequency of 50Hz. It is widely used in urban and rural power distribution networks, where it can serve as a disconnecting or linking switch, as well as an outdoor substation outlet switch for rural power distribution systems.

The circuit breaker adopts a permanent magnet operating mechanism, providing fast and reliable switching performance with stable mechanical operation. It is capable of performing functions traditionally provided by reclosers, including the reliable opening and closing of load currents and fault currents. With its compact structure and dependable operating performance, the ZW32-12M is well suited for outdoor distribution applications requiring reliable switching, control, and fault protection.

Shaanxi West Power Tongzhong Electrical Co., Ltd. is a leading manufacturer with over 20 years of industry experience, specializing in high-quality 7kV–40.5kV vacuum circuit breakers, switchgear, and a wide range of electrical products. Our advanced manufacturing processes, professional testing equipment, and strict quality control system ensure reliable and durable products for different power applications.

Our VTZ series vacuum circuit breakers feature excellent switching performance, high reliability, and long service life, with maintenance-free operation for up to 20 years. Supported by an experienced team of technical experts, we have strong capabilities in R&D, manufacturing, quality control, and after-sales service for high- and low-voltage electrical equipment. From product development to final delivery and technical support, we are committed to providing customers with reliable products and professional electrical solutions 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 that further reduces the number of mechanical components, simplifying the overall structure and improving operational reliability. The optimized mechanism also helps reduce maintenance requirements and provides stable, fast, and consistent switching performance.

High Reliability: The controller integrates an "anti-pumping" function that effectively distinguishes fault currents from closing inrush currents, ensuring accurate and reliable protection. This helps prevent unnecessary repeated operations and improves the stability of the power system.

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.

Product Applications

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

1. Outdoor 35kV or 110kV Substations and 10kV Power Transmission & Distribution Lines
Suitable for outdoor substation feeder and outlet applications, as well as switching and protection of 10kV transmission and distribution lines, helping improve the reliability and stability of power supply.

2. Agricultural Power Grid Systems
Widely applicable to rural and agricultural distribution networks, providing reliable load switching, fault interruption, and line protection, particularly for areas requiring stable and dependable outdoor power distribution.