npadma:
Can a relay also work the other way around, like high voltage circuit driving a low voltage circuit? If so, please provide me a link to such a product.
Sure, it the coil voltage of the relay is rated for use with the 'high voltage circuit' value you are working with AND if that HV circuit can spare the extra current the relay coil will draw. The output contacts can be used with any voltage/current that is within the maximum voltage/current ratings for it's contacts.
Lefty