Phoenix Contact 1015533 A safety relay for emergency stops and safety doors features light grids up to SIL level 3 and Cat. 4 certifications, offering one- or two-channel operation with cross-circuit detection capabilities. The device can be retriggered and has adjustable off-/on delay times ranging from 0.2 seconds to 300 seconds. It also includes five enabling current paths and is designed for use with a US power supply of 24V DC, utilizing a plug-in screw terminal block for easy installation and operation.