Latching RIBs

June 25, 2019
Tech Tuesday

Here at Functional Devices, we have another type of relay you may or may not know about: latching relays.

Identifiable by “RIBL” in the model name, latching relays are great because they mechanically latch themselves in their state. This means that they’re made to work with a pulse instead of a constant voltage, which saves power, and if you lose power your relay won’t switch off. If this is something you need for your application, then latching relays are the way to go.

Our latching relays use a three-wire system made to work with controllers or a momentary contact switch. One wire is used for a latch signal, another wire for an unlatch signal, and the third wire is a shared by both signals. Applying a voltage pulse between the latch wire and the shared wire will close the relay contact and mechanically latch them. The contacts then won’t unlatch until a similar voltage pulse is applied between the unlatch wire and the shared wire. This voltage pulse can be either 12Vac/dc or 24Vac/dc.

Here are a few examples:

There are also several variations of our latching relays. Model names with an “S” indicate that the relay has an override switch.

Models with an “M” indicate that the relay has an auxiliary contact for status feedback to a controller and an LED indicator. 

We even have some with both an override switch and an auxiliary contact.

As always, if you have any questions or need help selecting the right relay, be sure to contact us at tech support.

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About the Author

Tym Moore is an Electrical Engineer who hails from the best state of Colorado.
He graduated from Colorado State University in 2017 and moved to Indiana shortly afterward to marry his now wife. Outside of work, Tym spends most of his time driving back home, and complaining about how flat Indiana is.

Be sure to give Tym a call for tech support. He will always do his best to find a solution for you.