Low-voltage electrical contacts to what extent
The so-called low - voltage electrical contacts the contact situation, usually refers to the dynamic and static contacts between the contact pressure and contact area. Contacts in the contact pressure on the appropriate low-voltage electrical appliances, the contact area can be used "trace method" to determine: Take a piece of white paper and a carbon paper, folded and placed on the moving contact between the static contact, and then the electrical switch, So in the contact area of ​​white paper will leave the carbon paper marks. Will trace contact with the contact surface, you can find the contact area. The contact length or contact area shall not be less than 3/4 of the total contact length or contact area for a contact of 5 mm or less in general contact or contact; the contact area shall not be less than all Contact area of ​​2/3. When low-voltage electrical contacts use a certain time, one of the following conditions should be replaced: (1) The contact part (the working point is directly subjected to the arc) wears to 2/3 (copper contact) or 1/4 (silver or silver-based alloy contact) of the original thickness. (2) Contact Overtravel adjusted, still not up to the provisions of the minimum 3/5 or contact pressure below the lower limit. Special Custom High Speed Door
Our company is a door manufacturer integrating R&D, design, manufacturing, sales, installation and after-sales service. Our products include PVC soft-curtain high speed rolling door , PVC Curtain swing door, self repairing high speed door , turbine hard fast shutter door, automatic sliding doors, automatic swing doors, revolving automatic doors, automatic hospital doors,and folding automatic doors.
Nowadays, many companies like to buy PVC soft-curtain high speed rolling doors when purchasing PVC fast-rolling doors. What are the characteristics and advantages of it that make everyone love it? Let's talk about the overall advantages of PVC fast roller shutter doors.
Features and advantages of PVC fast roller shutter doors:
1.Good UV protection effect of PVC fast roller shutter door
The UV-proof door curtain of PVC fast rolling door, as the screen of the welding welding area, can filter harmful UV rays through the scenery, which is convenient for viewing the working situation, and prevents the flying and diffusion of sparks, smoke, debris, etc., to protect the safety of personnel. prevent fire.
Sound insulation effect PVC fast roller shutter door curtain can reduce noise decibels, prevent noise diffusion, reduce noise pollution, and be used as a machine compartment screen to improve the sound insulation effect of operations.
2. Good cold resistance effect of PVC fast roller shutter door
In the case of low temperature, the PVC fast rolling shutter can still maintain a high degree of softness, making it convenient for people and vehicles to enter and exit, and has a good isolation effect. It can prevent the loss of air conditioning and heating to a greater extent and save energy.
3. Good airtight performance of PVC fast roller shutter doors
A sealing strip with better sealing performance is installed in the track of the fast roller shutter door. With the weight of the door curtain itself, it will not bend and affect the normal operation under the wind speed of the harsh weather.
4. Good thermal insulation and energy saving effect of PVC fast roller shutter doors
PVC fast rolling shutter not only consumes no electricity, has no noise, no moving components, improves freezing efficiency, but also reduces the number of revolutions of the freezer, saving up to 50% of electricity.
5. Good anti-static effect of PVC fast roller shutter door
The curtain of the PVC fast rolling door does not produce static electricity after friction, which is suitable for the factory effect where static electricity is strictly prohibited.
Widely used in office buildings, public buildings, hotels, hospitals, supermarkets and factories in Asia, Eastern Europe and Africa. The specific requirements of an effective door system in different situations (eg clean room, operating room) may vary in different parts of the world.
Special Custom High Speed Door, Special Custom Rapid Door, Special Custom Fast Door SHENZHEN HONGFA AUTOMATIC DOOR CO., LTD , https://www.hongfafrud.com