The 40.5kV 630A–4000A Vacuum Circuit Breaker is part of our VTZ modular operating mechanism series. Through extensive optimization and improvements to the mechanical transmission system, main structural design, and secondary control circuits, the circuit breaker delivers enhanced reliability, stable operating performance, and convenient maintenance.

Designed for fixed installation in indoor switchgear, it is suitable for power distribution and protection systems with a rated voltage of 40.5kV and an AC frequency of 50Hz. With a robust structure and reliable operating mechanism, the circuit breaker is well suited for various medium- and high-voltage applications, including substations, industrial facilities, and power distribution systems.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	40.5
2	Rated Frequency	Hz	50
3	Rated Current	A	630/1250/1600/2000/2500/3150/4000
4	Rated Power Frequency Withstand Voltage	kV	95
5	Rated Lightning Impulse Withstand Voltage	kV	185
6	Rated Short-Circuit Breaking Current	kA	25/31.5/40
7	Rated Short-Circuit Making Current (Peak)	kA	63/80/100
8	Rated Withstand Current (Peak)	kA	63/80/100
9	Rated Duration of Short-Circuit	s	4
10	Operating Cycles at Rated Short-Circuit Breaking Current	Times	E2
11	Mechanical Endurance	Times	10000
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	19±2
2	Contact Overtravel	mm	4±1
3	Average Closing Speed	m/s	0.8±0.2
4	Average Opening Speed (Average Speed of First Opening at 12mm)	m/s	1.7±0.3
5	Rated Contact Pressure	N	3100±200N (25kA/31.5kA) 4800±300N(40kA)
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

The 40.5kV 630A-4000A Vacuum Circuit Breaker offers numerous advantages:

Breaker Performance

Meets E2-C2-M2 performance requirements, ensuring reliable electrical and mechanical endurance as well as stable switching performance under demanding operating conditions. This makes the circuit breaker suitable for applications requiring frequent operation and reliable fault interruption.

Convenient Maintenance

The modular mechanism design allows for easy replacement of closing and opening coils without disassembling other components. No testing or adjustment is required after replacement, enabling users to perform replacements independently and simplifying subsequent maintenance.

High Conductivity

The optimized insulated cylinder structure and high-performance flexible connection embedded pole effectively reduce contact resistance, ensuring reliable current transmission and stable power supply. The improved design also enhances the overall electrical performance and long-term operating reliability of the circuit breaker.

Strong Adaptability

This series of circuit breakers can be equipped with opening interlocks and main shaft interlocks, and can be customized with interlock designs based on user requirements. Special chassis trucks can also be designed or modified to meet specific cabinet needs.

Wide Range of Use

The product is designed to withstand harsh environments, including temperatures as low as -25°C, and meets operational requirements at altitudes of up to 2000 meters.

Product Applications

The 40.5kV 630A-4000A Vacuum Circuit Breaker is widely used in various applications, including:

New Energy Fields: Such as photovoltaic and wind power systems.

Industrial Fields: Including chemical, steel, petroleum, coal, and other industries.

Power Grid Systems

User Product Project Upgrades

Power Infrastructure

Product Outline Drawing

405kV 630A-4000A Vacuum Circuit Breaker manufacturer

Figure 1: VTZ-40.5K embedded pole circuit breaker (rated current ≤ 2500A)

Model	Distance between phases P	Fixed hole distance L1	Box width L2	Remarks
VTZ-40.5K-P300-1231	300	750	850
VTZ-40.5K-P400-1231	400	950	1050
VTZ-40.5K-P440-1231	440	1030	1130
VTZ-40.5K-P460-1231	460	1070	1170
VTZ-40.5K-P480-1231	480	1110	1210

Remarks:

1. 1231 in the model number represents rated current 1250A, rated breaking current 31.5kA;

2. When the distance between phases is 300, it is necessary to increase the insulating partition; the insulating partition is recommended to come with the cabinet;

3. When used in high altitude areas, the air distance needs to be corrected according to the actual requirements.

405kV 630A-4000A Vacuum Circuit Breaker factory