1. Selection of AC contactor for controlling electric heating equipment This type of equipment has electric resistance furnace, temperature control equipment, etc. The winding resistance component used in the electric heating component load can reach the current of 1.4 times of the rated current, if the Power Supply is taken into account. The current will increase as the voltage rises. The current fluctuation range of such a load is small, and it belongs to AC-1 according to the use category, and the operation is not frequent. When the contactor is selected, the rated working current Ith of the contactor is equal to or greater than 1.2 times the operating current of the electric heating device.
2. There are many types of lighting devices for controlling contactors for lighting equipment. Different types of lighting equipment, starting current and starting time are also different. This type of load is AC-5a or AC-5b. If the startup time is short, the heating current Ith can be selected to be equal to 1.1 times the operating current of the lighting device. The startup time is longer and the power factor is lower, and the heating current Ith can be selected to be larger than the operating current of the lighting device.
3. Control the selection of the contactor for the welding transformer When the load of the low-voltage transformer is turned on, the transformer has a short-term steep high current due to the short-circuit of the secondary side electrode, and a large current appears on the primary side, which can reach the rated current of 15~. 20 times, it is related to the winding arrangement of the transformer and the core characteristics. When the welding machine frequently generates sudden high current, so that the switch on the primary side of the transformer is subjected to huge stress and current, it is necessary to select the contact according to the short-circuit current and welding frequency of the primary side when the electrode is short-circuited under the rated power of the transformer. The current is greater than the primary current when the secondary current is shorted. This type of load usage is AC-6a.
4. Selection of contactors for motors The contactors for motors can be AC-2~4 according to the use of the motor and the type of motor. AC-3 can be used for the starting current at 6 times of rated current and the breaking current is rated current. Fans and pumps can be selected according to the table and the curve method, and can be selected according to the sample and manual.
The winding motor's on-current and breaking current are both 2.5 times rated current. Generally, a resistor is connected in the rotor to limit the starting current and increase the starting torque. The category AC-2 is used, and the rotary contactor can be used.
Yidashun supplies Wall Socket and extension socket for different countries. Power outlet is US, EU, UK, AUS, CN, Japan, and Korea optional. Standard grounding
power socket is with switch control and led indicator, and the switch contact is made of high quality silver alloy material, which has a good performance against
electric arc and melt weld. The on-off operations exceed 40000 times.
Besides, the socket is made of phosphor bronze, which has the character of good electrical conductivity and lasting elasticity. The USB ports on the electrical outlet are 5V2.1A output which are compatible with APPLE ipad (all models), iphone, Android phones and tablet, cell phones, gaming systems, digital cameras, GPS devices and all USB devices.
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Shenzhen Yidashun Technology Co., Ltd. , https://www.ydsadapter.com