These IDEM 24-Vac/Vdc Viper safety relays are designed with enhanced LED diagnostics and simplified wiring. The DIN rail-mount units have screw and pluggable connection options. SCR21, SCR32 and SCR73 series single-/dual-channel safety relays provide up to seven safety output contacts and three auxiliary output contacts for e-stop relay or safety gate relay applications. SCR3142TD series safety relays have a configurable delay function and eight status LEDs for easy diagnostics. Applications include guard door monitoring, e-stop devices and sensors. The SEU31 series safety relay expansion modules can be wired directly to the SCR21, SCR31, SCR73 and SCR3142TD series safety relays to provide additional safety contacts.