After some internet and YouTube surfing, I concluded that it's a pretty common application to have a Nest Hello doorbell along with a Chime Driver control the coil of a relay. The relay is used in any way needed to control power or signal to an existing chime or maybe a NuTone doorbell system via the relay contacts. Below is a generic wiring diagram to visually convey how the RIBU1C would be used in this system:
What's great about the RIBU1C is that the low voltage coil input is a range from 10-30 Volts. A lot of people trying to find a relay for this application had to use an additional 24 Vac transformer somewhere. The Nest Hello used 16 Vac from an existing doorbell transformer. The added relay would likely have a 24 Vac coil. The RIBU1C coil is flexible and can take in the 16 Vac signal. No need for a new transformer!
The Blue, Yellow, and Orange wires provide access to the relay contacts. The contacts on the RIBU1C relay are rated to 10 Amps, are dry, and can be used in any way needed within the contact ratings listed in the datasheet. The above diagram is rough. I do not know everything about the Nest Hello system. Be sure to follow Nest recommendations for wiring the Nest Hello.
Give us a call or send over an email if there are any technical questions about the RIBU1C relay.