What is the main function of the relay

What is the main function of the relay

                       
Update:2021-12-03
Summary:Magnetic latching relay is a new type of relay developed in recent years, and it is also an automati...
Magnetic latching relay is a new type of relay developed in recent years, and it is also an automatic switch. Like other electromagnetic relays, it automatically turns on and off the circuit. The difference is that the normally closed or normally open state of the magnetic latching relay is completely dependent on the action of permanent magnets, and the switching state of the magnetic latching relay is triggered by a pulse electric signal of a certain width.
Relay is an automatic switching element with isolation function, which is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment, and is one of the most important control elements.
Relays generally have an induction mechanism (input part) that can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.); The actuator (output part) of "off" control; between the input part and the output part of the relay, there is also an intermediate mechanism (drive part) for coupling and isolating the input, functional processing and driving the output part.
The relay has the following functions:
1) Expand the scope of control. For example, when the control signal of a multi-contact relay reaches a certain value, multiple circuits can be switched, disconnected, and connected at the same time according to different forms of contact groups.
2) Zoom in. For example, sensitive relays, intermediate relays, etc., with a very small control quantity, can control a circuit with a large power.
3) Integrated signal. For example, when a plurality of control signals are input to a multi-winding relay in a prescribed form, they will be compared and integrated to achieve a predetermined control effect.
4) Automatic, remote control and monitoring. For example, the relay on the automatic device and other electrical appliances can form a program control circuit to realize automatic operation.
The factory specializes in the production of various time relays, electromagnetic relays, electronic relays, high power relays, liquid level relays, solid state relays, high power relays, small relays, timers, counters, relays, etc.
The relay is essentially an electrical appliance that transmits signals. It achieves different control purposes according to the input signal.
Relays are generally used to switch on and off control appliances (motors)
For example, the current relay in a DC motor, when the current is too small or too large, it will control the start and stop of the motor after detecting the current signal
There are also thermal relays, such as a long-term overload of the motor, which causes the temperature to become too high, and it controls the motor to stop.