Product Description
Vacuum Breakdown:
The major insulating media are atmospheric air, oil, paper and
porcelain. These can withstand appreciable voltage but they are
very small as compared to the withstand voltage of a gap in vacuum.
In the vacuum arc the neutral atoms, ions and electrons do not come
from the medium in which the arc is drawn but they are obtained
from the electrodes themselves by evaporating its surface material.
Because of the large mean free path for the electrons, the
dielectric strength of the vacuum is a thousand times more than
when the gas is employed for arc interruption.
In the vacuum of range from 10–4 to 10–6 torr, the breakdown
strength is independent of the gas density, but varies with gap
length only. The actual value of breakdown voltage for a given gap
depends upon the condition of electrode surfaces. Highly polished
and thoroughly degassed electrodes have shown particularly high
breakdown voltages. Contacts get roughened after use and thus the
dielectric strength decreases which can be improved by applying
successive high voltage impulse sparks.
This does not alter the arc roughened surfaces but removes the
loosely adhering metal particles from the electrodes deposited
there by the vapour blast during arcing. It has been found that for
a vacuum of 10–6 torr some of the metals like silver, bismuth,
copper etc. attain their maximum breakdown strength when the gap is
slightly less than 3 mm. This property permits the use of short
gaps in vacuum switches which results in simplifying the operating
mechanism and increasing the speed of operation over conventional
switches.
| Item | Unit | Data |
| Rated short circuit breaking current | KA | 20 | 25 |
| Rated short circuit current(peak) | 50 | 63 |
| Rated short(thermal stable)current | 20 | 25 |
| Rated peak withstand(dynamic stable)current | 50 | 63 |
| Rated short circuit duration | S | 4 |
| Rated insulation level(1min) | 1min power frequancy withstand voltage | Dry | KV | 95 |
| Wet | 80 |
| Lightning impluse withstand voltage | 185 |
| Rated operating sequence | Times | 20 |
| Rated short-circuit current breaking times | ms | ≤80 |
| Rated operating voltage | A | AC110,220,DC110,220 |
| Contact opeaning distance | mm | 20 |
| Contact over-travelling distance | | 5±1 |
| Bounce time | | ≤5 |
| DC resistance per phase circuit | | ≤120 |
| Circuit breaker dimensions(L×W×H) | | 2460×2400×500 |
| Total weight with mechanism | kg | 1100 |
Company Information
INTRODUCTION
Zhejiang Xinkou Power Equipment Co.,Ltd, is a high-tech enterprise
specializing in developping, design, manufacture, sales, import and
export of low voltage and high voltage electrical products.
Company main products: indoor and outdoor high voltage vacuum
circuit breaker, load break switches, disconnecting switches, drop
out fuse cutour, lightning arrester, etc. All products comply with
the requirements of GB, IEC, ANSI and other international standard.
SERVICE
We have a very professional sales team which can offer you the best
service and answer you very professional questions, so you can feel
very comfortable before you buy machine from us. As is known to all
of us, after-sale service is the most important to all industries.
Our company has been trying our best to build a very professional
and high-caliber after-sale service team which can solve all
problems efficiently in the future.
FAQ
Q1. Can we have our logo or company name to be printed on your
products or the package?
Yes,you can.Logo and company name can be printed on our products by
silk screen printing.You can send us the artwork by email in JPEG
or TIFF format.
Q2. What is lead time?
Usually 3-15 working days, On-Time delivery
Q3. Why us?
All products comply with the requirements of GB national standards,
IC, ANSI and other international standards, and the requirements of
company's technology standards.
Q4. How do you make our business long-term and good relationship?
1. Our high quality and competitive price are the most important
factors to maintain long-term and good relation -ship with our
customers.
2. Good service is our basic principle for every customers.
Q5. Can I have a visit to your factory before the order?
Sure,welcome to visit our factory.
