Course Intermediate  11279

Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Course Advanced  17603

Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.

Course Advanced  11314

Course Introduction："Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.

Course Introduction：AC contactors are mainly used to control large currents in AC circuits and have a wide range of uses, including: controlling the start and stop, reversal and speed regulation of motors, controlling on-off and temperature-adjusting heating equipment, controlling lighting switches and dimming controls, on-off, starting and Stop pumps and fans, control rolling shutters and hoists, act as switching elements in automatic control systems

2024-04-04 comment 0  774

Course Introduction：The common maximum rated voltage of AC contactors is usually 1000 volts, but for special applications such as high-voltage motor starting, power conversion and renewable energy systems, contactors with higher voltage ratings can be used, including: 1. High-voltage motor starting; 2. High voltage power conversion; 3. Renewable energy systems.

2024-04-24 comment 0  610

Course Introduction：AC contactor is a low-voltage control appliance widely used in power control systems. It is mainly used to control the operation of motors and equipment. Its structure consists of moving and static contacts, arc extinguishing device, electromagnetic coil, etc. When the coil is energized, the electromagnetic force attracts the moving contact and the static contact to connect, and the circuit is connected; after the power is turned off, the moving contact is released, the contacts separate, and the circuit is disconnected. AC contactors carry large currents, and their actions are usually controlled by relays. It has a wide range of applications, such as starting equipment, forward and reverse control, remote control, protection of motor overload and phase loss, etc., and is widely used in electric drive and automatic control systems.

2024-04-07 comment 0  1093

Course Introduction：The electrical life of an AC contactor is generally 3-5 times the mechanical life. The electrical life is affected by contact wear, arc corrosion and contact welding; the mechanical life is affected by mechanism wear, spring fatigue and insulation aging.

2024-04-24 comment 0  952

Course Introduction：The common maximum rated working voltages of AC contactors are 220V, 380V, 660V and 1140V; usually, the maximum working voltage is the rated insulation voltage, and the electrical clearance and creepage distance of the electrical appliance are determined accordingly; a contactor often has several rated working voltages voltage, and also list the corresponding rated operating current or control power.

2020-08-20 comment 0  47863