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. Ceiling Fan with remote control, light kit like LED and bulbs and blades which some of them will automatically stretch out or put inside when it turns on or off. This ceiling fan also can be controlled by the remote control, which means all function of this ceiling fan can be controlled. What's more, LED can switch to different color temperature. Ceiling Fan With Led,Ceiling Fan With Light,Ceiling Fan With Blades And Light,Ceiling Fan With Blades And Led ZHONGSHAN UFAN ELECTRIC APPLIANCE CO. LTD , https://www.ufanceilingfan.com