Arc suppression circuit for limiting latching power relay arcing under operation and increase reliability

This project requires knowledge in power relay physics and arc suppression (TVS) techniques. We need a circuit to wrap around a latching power relay to minimize internal relay arcing during operation (make/break) for extended operational life. There are many conceptual ways of doing this such as snubber and varistor approaches, but we need specifics on products to use that are available today and their configuration. The relay in question is rated for 250V, 120A but we are operating in a 120VAC nominal environment with at most 60A full load. Datasheet of the relay can be provided. Expected life of the application/proposed solution is ~20 years with up to 10,000 operations over the life of the product.