The Allen-Bradley MSR138DP is a Guardmaster dual-channel safety monitoring relay designed to ensure the highest levels of machine safety. This versatile relay can monitor two separate dual-channel input devices, such as emergency stop buttons, safety gates, or light curtains, making it a flexible solution for complex safety applications. It provides two normally open (N.O.) immediate safety outputs and one normally closed (N.C.) auxiliary output for status signaling. Housed in a compact 22.5 mm DIN rail mountable enclosure, the MSR138DP is easy to integrate into control panels. It features a monitored manual or an automatic/manual reset function, allowing for configuration tailored to specific application requirements. This relay is a critical component for achieving compliance with global safety standards like Category 4 and PLe.