Tubatu was founded in 2008 and is a one-stop home improvement service platform for users. It has now opened 318 city sub-stations and has served 35 million Chinese families cumulatively. On Tubatu, users can get free house inspection, free design and quotation, decoration quality inspection, home furnishing e-commerce, quality construction Relay may be unfamiliar to some friends. It is a type of electrical equipment, mainly used in automated power systems, equivalent to an automatic switch, using small current to control large current. This article will introduce that electromagnetic relays are generally composed of iron core, coil, armature, contact reed, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating an electromagnetic effect, and the armature will overcome the tension of the return spring under the attraction of electromagnetic force and be attracted to the iron core, thereby driving the moving contact of the armature to close with the static contact (normally open contact). When the coil is de-energized, the electromagnetic attraction also disappears, and the armature will return to its original position under the reaction force of the spring, causing the moving contact to close with the original static contact (normally closed contact). This closing and releasing achieves the purpose of conduction and disconnection in the circuit. For the "normally open, normally closed" contacts of the relay, they can be distinguished as follows: when the relay coil is not energized, the static contact in the disconnected state is called "normally open contact"; the static contact in the connected state is called "normally closed contact". 1) Expand the control range. For example, when the control signal of a multi-contact relay reaches a certain value, it can simultaneously switch, disconnect, and connect multiple circuits according to different forms of contact groups. 2) Amplification. For example, sensitive relays, intermediate relays, etc., can control a circuit with very large power using a very small control quantity. 3) Comprehensive signals. For example, when multiple control signals are input to a multi-winding relay in a specified form, after comparison and synthesis, the predetermined control effect is achieved. 4) Automation, remote control, monitoring. For example, relays on automatic devices together with other electrical appliances can form program control circuits, thereby achieving automated operation. Regarding the knowledge of relay functions, thank you for your attention to Tubatu Decoration Network. For these electrical appliances, wires, wiring and working principles, professionals are more knowledgeable. You can ask professionals to help. Now if you are worried about whether the quality of the decoration company is guaranteed, we can ask Tubatu's professional quality inspectors to help us inspect. These are all free services of Tubatu Decoration Insurance, which are benefits for the majority of decoration owners! Click here to apply for Decoration Insurance for free, free professional quality inspection