Medium Voltage VCB 12kV 630A- 1250A-1600A Indoor Vacuum Circuit Breaker fixed type

VACUUM CIRCUIT BREAKER
630A/1250A/1600A/2000A/2500A/3150A/4000A
12kV/24kV/35kV

FIXED TYPE

HANDCART TYPE

 ZN63(VS1) series vacuum circuit breaker is used for rated voltage isolator 12kV-35kV, 3-phase switch device, the indoor as grid equipment, industrial and miningenterprises, power equipment control and protection unit. Due to the specialadvantage, vacuum circuit breaker products suitable for the current requirementsrated frequent operation, or multiple open short-circuit current.By the integral layout structure, breakers used spring operation mechanism ismature, simple structure and reliable performance. The reasonable construction,make each points clear, functional units to decorate maintenance.
ZN63(VS1) vacuum circuit breaker in the form of installed within theswitch can be fixed, also can be drawn. From 630A - 4000A rated current ratingfrom 20KA-31.5KA short-circuit current, real serialized form.

Model meaning

The ZN63 high-voltage circuit breaker (often also known as the VS1 circuit breaker, VS1 being its most common model designation) is an indoor-installed medium-voltage circuit breaker employing vacuum arc-extinguishing technology. It is widely used in three-phase AC 50Hz power systems with rated voltages from 3.6kV to 12kV, serving as a protective and control device for power equipment, and is one of the core switching devices in modern substations and industrial and mining enterprise power distribution systems.

Core Features Vacuum arc extinguishing technology Adopting high-performance vacuum arc extinguishing chamber, strong breaking ability, no explosion risk, environmentally friendly and pollution-free. The rated short-circuit breaking current can reach 20kA~31.5kA (depending on the model). Modular design The spring energy storage operating mechanism has a fast opening and closing speed and a mechanical lifespan of 10000 to 30000 times. Can be equipped with manual or electric control (supporting remote automation operation). Safety protection  Fully enclosed insulation structure, protection level IP3X, dustproof and moisture-proof. Built in mechanical interlocking to prevent misoperation. Standards Compliant with international/domestic standards such as GB/T 1984 and IEC 62271-100.

General product information

Product Commercial Terms

Product Parameters

Main specifications and technical parameter

Technical Data for opening and closing Coils

Product dimensions

High current products

Environmental conditions for use

Normal Operating and Installation Conditions

Ambient Air Temperature

• The upper limit shall not exceed +40°C, the lower limit shall not fall below -5°C, and the 24-hour average value shall not exceed +35°C. Note: Operating conditions with a lower limit of -10°C or -25°C must be confirmed by the user.
• Operating conditions exceeding the upper limit of +40°C or falling below -10°C or -25°C must be negotiated with the user. 3.2 The installation location must not exceed 2000m above sea level.

Atmospheric Conditions

The relative humidity must not exceed 50% at an ambient air temperature of +40°C. Higher relative humidity is permitted at lower temperatures. The maximum average relative humidity in wet months is 90%, and the average minimum temperature for that month is +25°C. Condensation on the product surface due to temperature fluctuations must be considered. If the temperature exceeds these limits, the user must consult with the user.

Protection Grade: IP30

Usage Category:Class B or Class A

Installation Category

Circuit breakers and undervoltage releases with a rated operating voltage of 660V (690V) or less, and the primary winding of the power transformer, are intended for installation category N; auxiliary circuits and control circuits are intended for installation category III.

Installation Conditions

Circuit breakers must be installed in accordance with the requirements of this manual. The vertical tilt of the circuit breaker must not exceed 5° (mining circuit breakers must not exceed 15°).

Internal component details

Internal constitutions:

1. Operating Mechanism→ Mechanical device controlling the opening and closing of the circuit breaker

2. Terminals (Fixed Type) → Electrical interface for fixed connections

3. Vacuum Interrupter → Core arc-extinguishing component containing contacts and ceramic insulator

4. Contact Arm (Drawout Type)→ Movable current-carrying component in drawout circuit breakers

5. Silver-Plated Copper Contacts→ Enhances conductivity and oxidation resistance

6. Drawout Chassis→ Frame structure supporting the movable parts of drawout circuit breakers

7. Insulating Cylinder→ Insulating housing encapsulating the vacuum interrupter

8. Aviation Connector→ High-reliability quick-disconnect interface

9. Finger Cluster Contacts→ Multi-finger contact design ensuring stable electrical connectio

Internal parts

Quality of important components of the product

Vacuum arc extinguishing chamber (vacuum tube) Sealed shell: Made of high-strength ceramic or glass, it maintains a permanent high vacuum, which is the basis of its arc extinguishing ability. Dynamic and Static Contact: Located inside, made of special materials such as copper chromium alloy, it can maintain performance at high arc temperatures and has low current cutoff value. Shielding cover: an internal key component used to uniformly apply an electric field, absorb metal vapor generated by an arc, and protect the insulation shell from contamination.

insulating cylinder Material: Usually made of high-performance epoxy resin cast through APG process, with metal connectors inside High insulation strength: able to withstand power frequency withstand voltage and impulse voltage far higher than the system voltage for a long time High mechanical performance: able to withstand huge push, pull, and impact during the opening and closing process without deformation or fracture. High dimensional stability: not easily deformed by temperature and humidity, ensuring transmission accuracy and stroke stability.

Quality Details

Product Installation

Product application scenarios

Core protection of power generation, transmission, and distribution networks

Power plant: protect the generator outlet and the plant power system.

Substation (core application scenario): Installed in 10kV to 35kV (medium voltage) distribution substations, it serves as a protection and control switch for key equipment such as outgoing lines, busbars, capacitors, and transformers. In the event of system faults such as short circuits, it can cut off the fault current in milliseconds.

The 'gateway' for industrial and commercial users

As the main switch for the main incoming cabinet, contact cabinet, and feeder cabinet in high-voltage distribution rooms of factories, large buildings, data centers, and hospitals. Responsible for the input and output of normal power supply, and quickly tripping in case of internal faults within the user to prevent the accident from escalating.

Frequent operation and special load control

Capacitor bank switching: Due to its good breaking capacitive current performance and long lifespan, it is very suitable for frequent switching operations of reactive power compensation capacitors.

Motor control: used to control the start and stop of large high-voltage motors.

Production line

Factory real shooting

Product testing

1、 Mechanical characteristic testing (verifying mechanical action performance)

Travel - Overtravel Test:

Total travel: The complete displacement of the moving contact from closing to opening.

Overtravel: After closing, the contact continues to compress the displacement of the spring. Ensure reliable contact of the contacts and sufficient electrical wear compensation.

Open distance test:

The shortest insulation distance between the moving and stationary contacts after disconnection. It must be large enough to ensure reliable insulation.

Three phase synchronization test (opening/closing):

Measure the time difference between the opening or closing of the three-phase contacts. Require extremely small time intervals (such as<2ms) to reduce operating overvoltage and ensure balanced disconnection.

2、 Electrical performance testing (verifying current carrying and breaking capacity)

Circuit resistance test:

Apply a direct current (usually 100A) to the circuit breaker and measure the milliohm resistance of its main circuit (including contacts). The resistance value must be extremely low and stable, otherwise it will cause abnormal heating during operation.

High current test (temperature rise and dynamic thermal stability):

Temperature rise test: Apply rated current for a long time and measure the temperature rise of each part not exceeding the limit.

Dynamic/Thermal Stability Test: Short term (e.g. 4 seconds) withstand current (thermal stability) and peak withstand current (dynamic stability) to verify its ability to withstand short-circuit current effects.

Overload and opening/closing operation test:

Overload test: Verify the tolerance under the agreed overload current.

Opening and closing operation test: Verify that the mechanism can reliably open and close at the specified minimum/maximum operating voltage.

3、 Insulation and protection function test

Voltage withstand test (insulation strength verification):

Power frequency withstand voltage: Apply AC high voltage far higher than the rated voltage (such as 42kV/1min) to the fracture and ground to verify that the main insulation has no flashover or breakdown.

Impulse withstand voltage: Apply standard lightning or operational shock waves to verify the ability to withstand instantaneous overvoltage.

Protection function and auxiliary characteristic testing

Undervoltage trip test: When the power supply voltage is lower than the set value, it should automatically and reliably trip.

Bounce test: measures the brief disconnection time of the contact caused by collision during the closing process.

Packaging

Outer packaging:

Strong wooden boxes are usually used to provide sufficient mechanical strength.

Wooden crate suitable for large circuit breakers or international transportation

Inner packaging:

Wrap the circuit breaker with buffer materials such as foam pad, bubble film or pearl cotton to prevent vibration and collision.

For large circuit breakers, the packaging box may adopt a layered design, with accessories (such as manuals, tools, spare parts) placed on the upper layer

Q: What is the voltage/current range of this product? What is its breaking capacity?

A: Please contact customer service for details.

Q: What is the minimum order quantity? Do you accept sample orders?

A: The minimum order quantity is 1 set, and we accept sample orders.

Q: What is the warranty period? How do I apply for a warranty?

A: The product warranty is 1 to 2 years. Please contact customer service directly to apply.

Q: Do you have CE, RoHS, UL, or other certifications? Can you provide certificates?

A: We have CE and RoHS certifications and can provide certificates.

Q: Does the price include tax/shipping?

A: The price does not include shipping/tax.

Q: What notable clients or project examples have you worked with?

A: State Grid Corporation of China, Chint Group.