440R-E21358 Allen‑Bradley Guardmaster MSR122E Safety Monitoring Relay

440R-E21358 belongs to Allen‑Bradley Guardmaster 440R series safety relay, model MSR122E, 24V AC/DC power supply, equipped with 6 normally open safety contacts and 1 normally closed auxiliary contact. It monitors emergency stop buttons, safety door switches and other safety field devices, cuts off power to machine actuators immediately when safety signal triggers. Widely used in legacy printing, packaging and material handling automation system maintenance and spare replacement. 440R-E2135 is the short form reference of this full model.