The RIBU2C contains two separate, isolated relays, each with two coil inputs (120 Vac and 24 Vac/dc) and a SPDT relay output; it is essentially two RIBU1Cs in a single enclosure. If it is wired like Figure 1, the Load will not be energized unless SW1 AND SW2 are closed. Switches are used in the diagrams for simplicity. However, any sensor or control contact rated for the coil voltage and current would suffice.
Figure 2 illustrates how the RIBU2C would be wired for an OR function. If either SW1 OR SW2 closes, the Load will be energized. Both diagrams are only using two inputs and two outputs, because that is what the RIBU2C has. Either can be expanded, by adding more RIBs, to include as many inputs and outputs as needed. The same principles apply. The AND function requires the contacts to be wired in series. The OR function requires the contacts to be wired parallel. There are two other RIB products that would be great for this application as well.
The RIBH2C could be used in place of the RIBU2C in the above diagrams. The RIBH2C is the same as the RIBU2C, except its High Voltage coil input is 208-277 Vac instead of 120 Vac. Also, the RIBU2S2 would work great for these applications. It has two isolated, SPST-NO outputs with an override switch for each. Just remember that the contacts are wired in series or parallel, so care must be taken to flip the override switch(es) appropriately to turn the Load ON or OFF. Always be sure to verify Load ratings are within the specifications of the devices that are controlling them and contact us if you are not sure.
Functional Devices, Inc., located in the United States of America, has been designing and manufacturing quality electronic devices since 1969. Our mission is to enhance lives in buildings and beyond. We do so by designing and manufacturing reliable, high-quality products for the building automation industry. Our suite of product offerings include RIB relays, current sensors, power controls, power supplies, transformers, lighting controls, and more.
We test 100% of our products, which leads to less than 1 out of every 16,000 products experiencing a failure in the field.
Simply put, we provide users of our various products confidence and peace of mind in every box.