Product Overview
Zhejiang Lvma Electric Co., Ltd. ZN85-40.5 Indoor Medium Voltage Vacuum Circuit Breaker is a high-performance, solid-sealed trolley-type switchgear designed for 40.5kV, 50Hz three-phase AC power systems. Adopting advanced APG automatic pressure gelation technology, the breaker fully encapsulates the vacuum interrupter and main conductive circuit into an epoxy resin pole, forming an integrated solid-sealed insulation structure. This mature and advanced manufacturing process delivers superior insulation performance, high structural stability and outstanding operational reliability, representing top-tier design level for modern high-voltage vacuum circuit breakers.
Engineered for frequent operation and repeated short-circuit interruption, the ZN85-40.5 model features excellent electrical endurance and stable switching capacity. It is widely applied in power plants, substations, petrochemical, metallurgy, manufacturing, airports and residential power systems, providing precise and reliable control and fault protection for medium-voltage electrical facilities.
Highly versatile and interchangeable with VD4 and VEP circuit breakers, this vacuum circuit breaker supports both removable and fixed installation in air-insulated switchgear. It can coordinate with upstream 33kV VCB breakers to realize layered and graded power grid protection, effectively improving the overall safety and stability of medium-voltage power distribution systems for various industrial and commercial projects.
Key Features
Advanced APG Solid-sealed Insulation Structure
Adopts automatic pressure gelation technology to integrally encapsulate the vacuum interrupter and conductive parts with epoxy resin. The fully sealed pole eliminates external dust, moisture and pollution interference, providing superior insulation performance and long-term operational stability.
Excellent Frequent Operation Performance
Optimized internal structure and high-quality vacuum interrupter enable stable rated current switching and repeated short-circuit interruption. It perfectly fits working scenarios requiring frequent and continuous operation.
Strong Compatibility & Interchangeability
Fully interchangeable with mainstream VD4 and VEP circuit breakers. It supports both trolley-type removable and fixed installation, adapting to various air-insulated switchgear cabinets for flexible on-site matching.
Reliable Layered Grid Protection
Capable of coordinating with 33kV upstream VCB equipment to form multi-level graded protection, effectively reducing system fault risks and improving the overall safety and continuity of medium-voltage power distribution networks.
Wide Application & High Durability
Designed for 40.5kV indoor medium-voltage systems, featuring strong electrical endurance, compact structure and low maintenance needs, delivering cost-effective and long-lasting power protection for industrial, commercial and utility projects.
Applications
The ZN85-40.5 indoor medium voltage vacuum circuit breaker is widely used in 40.5kV three-phase AC indoor power distribution systems, serving as core control and protection equipment for various high-end medium-voltage projects. Thanks to its solid-sealed insulation structure, strong frequent-operation capability and excellent system compatibility, it is highly favored for demanding industrial, utility and infrastructure scenarios.
It is extensively applied in power plants, municipal substations and urban power grid renovation projects, delivering stable switching and reliable short-circuit protection to ensure safe and continuous grid operation. In heavy industries such as petrochemical, metallurgy and large manufacturing factories, the breaker adapts to long-cycle and high-frequency operation requirements, effectively safeguarding high-load industrial power systems.
In addition, it is an ideal solution for key infrastructure including airport power stations, commercial complexes and large residential districts. With flexible cabinet adaptability and graded protection coordination with upstream 33kV VCBs, the ZN85-40.5 provides stable, low-maintenance and highly safe power protection for diversified modern medium-voltage power distribution systems.
Related Products
Technical Specifications
ZN85-40.5 indoor vacuum circuit breakers adopt advanced APG solid-sealed technology and comply with international medium-voltage switchgear standards, delivering stable and consistent electrical and mechanical performance for 40.5kV indoor power distribution systems.
Rated Voltage: 40.5kV
Rated Frequency: 50Hz
Applicable System: Three-phase AC indoor medium-voltage power system
Insulation Technology: APG automatic pressure gelation solid-sealed epoxy resin pole
Core Performance: Supports frequent rated current switching and repeated short-circuit interruption
Installation Method: Trolley-type removable / fixed installation
Compatibility: Interchangeable with VD4 and VEP circuit breakers, suitable for air-insulated switchgear
System Matching: Supports layered protection coordination with 33kV upstream VCB breakers
Operation Environment: Standard indoor environment, dust-proof and moisture-proof structure
Zhejiang Lvma Electric supports customized technical parameters to match different cabinet types and project specification requirements, ensuring perfect adaptability for various medium-voltage power projects.
Type and meaning
Main Technical Parameters
|
No. |
item |
Unit |
Parameter |
|
|
1 |
Rated Voltage |
kV |
40.5 |
|
|
2 |
Rated Frequency |
Hz |
50 |
|
|
3 |
Rated Lightning Impulse Withstand Voltage (Peak) |
kV |
185 |
|
|
4 |
Rated Short-Time Power Frequency Withstand Voltage (1 minute) |
kV |
95 |
|
|
5 |
Rated Current |
A |
630,1250,1600 |
1600,2000,2500 |
|
6 |
Rated Short-Circuit Breaking Current |
kA |
25 |
31.5 |
|
7 |
Rated Short-Circuit Making Current (Peak) |
kA |
63 |
80 |
|
8 |
Rated Short-Circuit Duration |
S |
4 |
|
|
6 |
Rated Operating Sequence |
O-0.3s-CO-180s-CO |
||
|
10 |
Rated Breaking Current for Single/Back-to-Back Capacitor Bank |
A |
630/400 |
|
|
11 |
Rated Number of Short-Circuit Breaking Operations |
times |
30 |
|
|
12 |
Closing Time |
ms |
≤ 75 |
|
|
13 |
Opening Time |
ms |
≤ 65 |
|
|
14 |
Mechanical Life |
times |
10000 |
|
|
15 |
Rated Stored Energy and Operating Voltage |
V |
AC220/110 DC220/110 |
|
|
16 |
Contact Gap |
mm |
18±2 |
|
|
17 |
Contact Over-Travel |
mm |
7.5±1.5 |
|
|
18 |
Average Closing Speed |
m/s |
0.7±0.2 |
|
|
19 |
Average Opening Speed |
m/s |
1.6±0.2 |
|
|
20 |
Contact Bounce Time during Closing |
ms |
≤ 3 |
|
|
21 |
Three-Phase Closing/Opening Asynchrony |
ms |
≤ 2 |
|
|
22 |
Main Circuit Resistance |
μΩ |
≤ 50(630A,1250A) |
|
FAQ
Q1: What is the application scope of the ZN85-40.5 vacuum circuit breaker?
A1: It is an indoor medium-voltage circuit breaker designed for 40.5kV, 50Hz three-phase AC power systems, widely used in power plants, substations, petrochemical, metallurgy, airport and urban residential power distribution projects.
Q2: What are the core advantages of its APG solid-sealed structure?
A2: The advanced APG pressure gelation technology fully seals the vacuum interrupter and conductive parts, effectively preventing dust, moisture and environmental pollution. It provides superior insulation performance, stable operation and longer service life with low maintenance.
Q3: Does this breaker support frequent switching operation?
A3: Yes. The ZN85-40.5 model is specially optimized for frequent rated current switching and repeated short-circuit interruption, perfectly suitable for high-frequency operation scenarios.
Q4: Is the ZN85-40.5 compatible with other mainstream breakers?
A4: Absolutely. It is fully interchangeable with VD4 and VEP circuit breakers, supporting both trolley-type removable and fixed installation for air-insulated switchgear.
Q5: Can this VCB work with other voltage level switchgears?
A5: Yes. It can coordinate with upstream 33kV vacuum circuit breakers to realize multi-level layered protection, greatly improving the overall power grid safety and stability.
Q6: Do you provide customized services for this model?
A6: Yes. We support personalized parameter and configuration customization to meet different cabinet sizes and medium-voltage project requirements.
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