About 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.

40.5kV vacuum interrupter for vacuum circuit breaker is a critical component of high voltage power switches in 40.5kV systems. Its primary function is to utilize the excellent insulating properties of the vacuum within the tube to quickly extinguish the arc and suppress the current once the medium to high voltage circuit is interrupted. This process helps prevent accidents and unexpected incidents. The vacuum interrupter is mainly used in power transmission and distribution control systems.

Product Specifications

Specification Sheet

No.

Name

Unit

Data

Voltage Parameters

1	Rated Frequency (fr)	Hz	50/60
2	Rated Voltage (Ur)	kV	40.5
3	Rated Short-Time(1 min) Power Frequency Withstand Voltage (Ud)	kV	95
4	Rated Lightning Impulse Withstand Voltage (Peak) (Up)	kV	185

Current Parameters

1	Rated Current (Ir)	A	630/1250/1600/2000/2500
2	Rated Short-Circuit Breaking Current (Isc)	kA	25/31.5
3	Operating Cycles at Rated Short-Circuit Breaking Current	Cycles	30
4	Rated Short-Time Withstand Current (Ik)	kA	25/31.5
5	Rated Duration of Short-Circuit (tk)	s	4
6	Rated Withstand Current (Peak) (Ip)	kA	63/80
7	Rated Short-Circuit Making Current (IMC)	kA	63/80
8	Rated Short-Circuit Breaking Current DC Component	%	40
9	Standard Operating Sequence	mm	O-0.3s-CO-180s-CO

Mechanical Parameters

1	Mass of Moving Parts	kg	3.2~3.5
2	Self-Closing Force of Contact	N	200±50~230±100
3	Rated Contact Pressure	N	2700±200~4700±100

Requirements for Switch Mechanical Characteristics

1	Clearance between Moved and Fixed Contact	mm	22±1
2	Average Opening Speed (from 75% of the contact gap to contact closed position)	m/s	1.7±0.3
3	Average Closing Speed (from 30% of the contact gap to contact closed position)	m/s	0.8±0.2
4	Contact Closing Bounce Time	ms	≤2
5	No-Simultaneity of Contact Closing and Opening	ms	≤2
6	Contact Opening Rebound Amplitude	mm	≤2

Lifespan

1	Storage Period	Years	20
2	Mechanical Endurance	Times	10000
3	Allowable Wear Thickness of Contact	mm	3

Product Advantages

Strong Arc Extinguishing Capability

In a vacuum environment, the arc is easily extinguished, enabling fast and effective circuit interruption with a high breaking capacity.

High Insulation Level

Vacuum offers excellent insulating properties, capable of withstanding high voltages, ensuring the safe operation of the circuit.

Long Life

The internal structure is simple, free from oxidation problems that could affect the contacts, resulting in long mechanical and electrical life.

Compact and Lightweight

Supports the design of smaller, more compact equipment.

Easy Maintenance

Basically no special maintenance is required, and the operation reliability is high.

No Explosion Risk, Pollution-Free

During operation, there is no danger of explosion and no harmful gases or substances are emitted, making it environmentally friendly.

Low Noise

Produces minimal noise during operation.

‌Product Applications

40.5kV vacuum interrupter for vacuum circuit breaker is widely used in 40.5kV distribution systems across various industries such as metallurgy, mining, petroleum, chemical engineering, railways, broadcasting, communications, and industrial high-frequency heating.