Time relay is a kind of control appliance which realizes delay control by electromagnetic principle or mechanical principle. It has many kinds of air damping, electric and electronic and other types. In the early stage, the air damped time relay is often used in the AC circuit, which uses the principle of air throttling through the orifice to obtain the delay action. It consists of three parts: electromagnetic system, delay mechanism and contact.
Time relay all relays sensor components get action signal, the actuator (contact) should be delayed for a period of time before action relay time relay is called the most commonly used for large scale integrated circuit of the time relay, it is the use of RC principle to realize the time delay. In AC circuits often use transformer to buck, integrated circuit as the core device, the output using small electromagnetic relays, make product performance and reliability than the air damping type time relay is better early than the timing precision and controllability of the products also increased a lot. With the popularity of SCM, the manufacturers have adopted single-chip microcomputer as the core device of time relay, and the controllability and timing accuracy of the product can be adjusted by software, so the future time relay will be completely replaced by scm.
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