I'm not familiar with "RCT-402" as a specific product, technology, or standard. It's possible this could be:

1. A model number or part number for a piece of equipment or component

2. An internal code or project name used by a company

3. Part of a larger acronym or technical specification that I'm not recognizing

Without more context about where you encountered this designation or what field it might relate to, it's difficult to provide accurate information. If you have any additional details about the context or application of RCT-402, I'd be happy to try and help further. Otherwise, you may want to check with the source where you first saw this designation for more information.