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Frequently Asked Questions

General-purpose Relay Topic: Latching Relay

 

FAQ No. FAQ02822

 

Question

What is a latching relay?


Answer

It is a relay that is set (ON) or reset (OFF) by the input of a pulse voltage. Even after the input voltage is interrupted, this relay maintains its set or reset condition until it receives the next inverting input. It is also called a keep relay.

There are two types of mechanisms for maintaining the set and reset conditions: a magnetic holding type and a mechanical holding type.

There are also two types of coils for applying the set and reset pulse voltages: a single-winding type and a double-winding type.

Basic Operation:

Outline
In these Relays, the input pulse of the set coil causes the operating condition to be maintained magnetically or mechanically, whereas the input pulse to the reset coil side puts the Relay into the reset condition.
 

Double-winding Latching Relay

 

Outline
In these Relays, the set input pulse causes the operating condition to be maintained magnetically, whereas the reset input pulse (input with inverse polarity of set input) puts the Relay into the reset condition.

 

Single-winding Latching Relay
 

Applicable Models: MMK, MYK, G2AK

 

 

Other General-purpose Relay FAQs

 What is the number of contact poles?

 The Relay does not operate even when voltage is applied. Why is this?

 The Relays operates but there is no contact continuity. Why is this?