What is magnetic latching relay

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 certain width of pulse electric signal.

Magnetic latching relays are divided into single-phase and three-phase. According to relevant information, the maximum contact switching current of magnetic latching relays on the market can reach 150A; the control coil voltage is divided into DC9V, DC12V, etc. The life of general electrical appliances is 10,000 times; the mechanical life is 1,000,000 times; the contact voltage drop of contacts is less than 100mV. Therefore, it has the characteristics of power saving, stable performance, small size, large carrying capacity, and superior performance than general electromagnetic relays.

Principle of action

The open and closed state of the magnetic latching relay is usually held by the magnetic force generated by the permanent magnet. When the contacts of the relay need to be opened or closed, only the positive (reverse) DC pulse voltage is needed to excite the coil, and the relay completes the state transition between opening and closing in an instant. Normally, when the contact is in the holding state, the coil does not need to continue to be energized, and only the magnetic force of the permanent magnet can maintain the state of the relay.

Action process

When the contact of the relay needs to be set, it is only necessary to excite the coil J2 with a positive DC pulse voltage. The magnetic pole generated by the coil J2 after excitation interacts with the magnetic pole of the permanent magnet, and the same polarity repels each other, and the different polarity attracts each other, making the relay The state transition from reset to set is completed in an instant.