Yueqing Face Electric Co., Ltd.
Yueqing Face Electric Co., Ltd.
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Definition and working principle of latching relay

The latching relays are divided into three-phase and single-phase. We checked the relevant information and found that the contact switching current of magnetic latching relays on the market can reach 150A; the control coil voltage is DC9V, DC12V, etc., and the electrical life is usually 10,000 times; the mechanical life is usually 1 million times; the contact voltage drop is less than 100mV. Therefore, latching relays have the characteristics of power saving, stable performance, small size, and large carrying capacity. Compared with electromagnetic relays, magnetic latching relays have superior performance.


1. What is a latching relay?


Magnetic latching relays are a new type of relay developed in recent years. They are also an automatic switch. Like other electromagnetic relays, they automatically connect and disconnect circuits. The difference is that the normally closed or normally open state of the magnetic latching relay depends entirely on the action of the permanent magnet, and the conversion of its switch state is completed by triggering a pulse electrical signal of a certain width.


2. What are the working principles of latching relays?

When the coil is passed with current in different directions, magnetic fields of different polarities will be generated, which will attract or repel the internal permanent magnet, and the switch contacts will be closed or disconnected by the magnet. The control coil of the magnetic latching relay does not need to be energized for a long time, and only one pulse is needed to control the opening or closing.

latching relays

3. What is the function of the latching relay?


1. Expand the control range


Example: When the control signal of the multi-contact relay reaches a certain value, multiple circuits can be switched, disconnected, and connected at the same time according to the different forms of the contact group.


2. Amplification


Example: Sensitive relays, intermediate relays, etc. can control high-power circuits with very small control quantities.


3. Comprehensive signal


Example: When multiple control signals are input into the multi-winding relay in a prescribed form, they are compared and integrated to achieve the predetermined control effect.


4. Automatic, remote control, monitoring


Example: The relays on the automatic device can form a program control circuit together with other electrical appliances to achieve automatic operation.




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