MA3 is a proximity magnetic sensor designed for entry control and detection applications, featuring miniaturized reed contacts with normally open (NO) output function. The sensor is housed in a compact rectangular plastic enclosure with dimensions of 37 x 16 x 8.3 mm and includes a 0.5 m PVC cable connection. It delivers a maximum switching voltage of 500 VAC and maximum switching current of 0.5 A, with a maximum switching power of 10 VA, operating reliably across a temperature range of -25°C to +75°C. The sensor achieves an IP 67 degree of protection and operates at distances up to 35 mm depending on the selected magnetic unit (CL1 through CL4), making it suitable for industrial automation, security systems, and position detection applications where compact size and reliable switching performance are required.