The Phoenix Contact REL-MR-4.5DC/21 is a genuine miniature power relay module designed for industrial applications. It features a soldered-in miniature power relay with a single-pole double-throw (1 PDT) contact, capable of switching up to 6A at 250V AC/DC. This module operates with a 4.5V DC input voltage and includes an LED status display and a test button for easy monitoring and operation. It is suitable for DIN rail mounting (NS 35/7,5 or NS 35/15) and offers screw connection terminals for reliable wiring. With an IP20 protection class and a wide operating temperature range of -40°C to 70°C, it ensures robust performance in various industrial environments. The compact design measures 80 mm in height, 6.2 mm in width, and 94 mm in depth, making it ideal for space-constrained installations.