Phoenix Contact 1487649 This safety relay offers multiple functions and meets various safety standards, including SIL 3 and Cat 4 certification for high-risk applications, as well as compliance with PL e regulations, supporting up to two channels of operation in both automatic and manual modes, with monitored start functionality, and features a single enabling current path, signal output, and a power source of 24V DC, utilizing a plug-in screw terminal block.