mma3 – mm.a.3 magnetic sensor

Why Choose the Carlo Gavazzi MMA3 Magnetic Sensor?

The Carlo Gavazzi MMA3, also identified as MM.A.3, is a compact rectangular magnetic proximity sensor designed for reliable position and presence detection in industrial automation applications. Part of the Carlo Gavazzi MM series, it combines a miniature plastic housing with a normally open reed contact, making it particularly useful where installation space is limited.

The MMA3 operates in conjunction with an external magnet. As the magnet enters the sensor's operating range, the internal reed contact changes state, providing a simple potential-free switching signal for compatible control equipment. This magnetic operating principle allows detection without physical contact between the target and sensor, helping minimise mechanical wear in repetitive positioning and monitoring applications.

The MMA3 features a normally open (NO) dry reed contact, maximum switching voltage of 500 V AC, maximum switching current of 500 mA and maximum switching power of 10 VA. It offers a maximum switching distance of 35 mm, an integrated 0.5 m cable, IP67 protection and an operating temperature range of -25 to +75 °C.

Key Advantages

• Compact rectangular magnetic proximity sensor for space-conscious installations.
• Normally open dry reed contact provides simple potential-free switching.
• Maximum switching distance of 35 mm for flexible non-contact detection.
• High maximum switching voltage of 500 V AC.
• Integrated 0.5 m cable simplifies hard-wired installation.
• IP67 protection supports reliable use in demanding industrial environments.

Key Features

• Carlo Gavazzi MM series magnetic proximity sensor.
• Compact rectangular plastic housing.
• Normally open (NO) output function.
• Dry reed contact switching technology.
• 35 mm maximum switching distance.
• 500 V AC maximum switching voltage.
• 500 mA maximum switching current.
• 10 VA maximum switching power.
• Integrated 0.5 m cable.
• Compact dimensions of approximately 27 × 11 × 7 mm.
• IP67 degree of protection.
• -25 to +75 °C operating temperature range.
• Suitable for industrial position and proximity detection.

Compact Non-Contact Magnetic Proximity Sensing

Magnetic proximity sensors use an external magnet to operate an internal switching element, allowing objects, doors, mechanisms and moving components to be monitored without direct mechanical contact. Reed-contact technology provides a straightforward switching method and can be particularly useful where a potential-free output is required instead of a conventional electronic transistor output.

The compact Carlo Gavazzi MMA3 is designed for applications where mounting space is restricted while a useful magnetic sensing distance is required. Its small 27 × 11 × 7 mm housing and maximum 35 mm switching distance make it suitable for position monitoring, level detection, access control, lifts and a variety of industrial automation applications when paired with an appropriate operating magnet.

Typical Applications

• Industrial position detection.
• Machine component position monitoring.
• Door and access monitoring.
• Lift and elevator systems.
• Gate control systems.
• Level detection applications.
• Automated machinery.
• Factory automation and control systems.