PSRmini Slim Safety Relays Phoenix Contact PSRmini Slim Safety Relays are narrow safety relays with widths of no more than 6 or 12mm. These relays offer space-saving potential of up to 70% compared to standard relays while providing the same functionality. PSRmini relays feature force-guided contacts and a fine-grained architecture that makes a modular design of safety concepts possible. The 6mm version provides one to two approval paths while the 12mm version offers two to three approval paths.