Category Archives: Technical Support

Video: Two-Way Wireless RIB Relay Transceivers with EnOcean® Technology

Mark from Functional Devices made this excellent product training video about Two-Way Wireless RIB Relay Transceivers with EnOcean® Technology.


See more about the Two-Way Wireless RIB Relays from Functional Devices.

Looking for a Relay Wiring Diagram?

Need a RIB relay wiring diagram?

How about a RIB relay AutoCAD drawing?

Or a RIB relay Visio drawing?

Then you should know about a terrific resource on the Functional Devices website. From the Functional Devices website you can download RIB Relays Data Sheets, Wiring Diagrams, AutoCAD Drawings and Visio Drawings all in one place. As you research RIB relays, transformers, current sensors and power supplies make sure to take a look at the site. Many of the Functional Devices products that we sell in our online store have wiring diagrams and other resources available for download!

RIBU1C Wiring Diagram
RIBU1C Wiring Diagram

Controlling a Closet Light with a RIB Relay

We received the following question about using a RIBU1C  to control a closet light.

I bought a RIBU1C relay to control a closet light by using a small low voltage switch in the door jam. I have a 24volt transformer and 120 volts for the lights. Would you please help me with an explanation of where my wires go to yours.

A CLC212 closet light switch (enclosed 10A SPST, 120-277 Vac) would work for this application. With a CLC212 closet switch you can use existing wiring to turn on the closet light just by opening the closet door.

To explain how to connect the RIBU1C, we put together the following  schematic.

RIBU1C RIB relay schematic

RIB Relay Closet Light Schematic

Rated Load Question

Here’s a question we answered today about rated load.


As an example, you have a contact rating 20 amps resistive load @ 208.  Is the rated load the same whether the contacts are normally open or normally closed?  I know it makes a difference on tungsten load and compact fluorescence but I’m not sure if it does on resistive loads.

The rated load is the same regardless of whether it is NO (normally open) or NC (normally closed).

Current Sensor Question

RIBXGTA current sensor

RIBXGTA Enclosed Split-Core Sensor

This is a question we received this week about current sensors.

Can you use a current switch contact to energize a contactor coil if I have 24 volt transformer power going through the contact to power a contactor coil? I am not sure how the switch works if the switch needs its own power or just closes a contact when current is sensed? I have to interlock 3 exhaust fans and a damper and this would make my life easier.

Answer can make your life easier – our RIB current sensors will work perfectly for your application. A RIB current sensor will close its contact when current is sensed. You do not need additional power for the RIB to function.

We currently have two styles of current sensors that you can choose for this application such as the RIBXKTF (Enlosed Solid-Core Sensor) or RIBXGTA (Enclosed Split-Core Sensor). You will select the current sensor you need based on the amperage draw being applied to the sensor.  BHUW3TCXGXZS

RIB02BDC Question


RIB02BDC RIB relay

We will periodically be sharing some of the  questions about RIB relays we get from customers. We hope you find this helpful!

This is a question we recently received from a customer about RIB02BDC.

Will an RIB02BDC relay work with a 240 volt heater turning on and off both phases with a thermostat?

The RIB02BDC is a 20 Amp SPDT relay and therefore will not break both phases of a 240 volt heater. You would need to use an RIB24P (24V Coil), RIB01P (120V Coil) or RIB02P (208V Coil).