The Allen-Bradley Guardmaster MSR138DP is a versatile safety monitoring relay designed for implementing robust machine safety systems. It is capable of monitoring a variety of safety input devices, such as emergency stop push buttons, safety switches, and light curtains. A key feature of the MSR138DP is its dual functionality, providing both immediate and time-delayed safety outputs. This allows for applications that require a safe, controlled stop sequence, ensuring that hazardous motion has ceased before access is permitted. With its compact DIN rail mount design and clear diagnostic LEDs, the MSR138DP offers a reliable and user-friendly solution for achieving high levels of safety integrity in industrial automation.