Connector

Circular connectors form the backbone of modern automation technology. From compact M5 versions for confined installation spaces to robust M25 variants for high-performance applications, the range covers all standard sizes. The various locking mechanisms – bayonet for quick assembly, push-pull for tool-free connection or classic screw locking – enable optimal solutions for a wide range of operating conditions.

An overview of product groups

• M5/M8 miniature connectors: Compact design for sensors and actuators in automation, 3- to 4-pin, protection ratings up to IP67
• M12 circular connectors: Standard for sensor/actuator cabling, A/B/D/X coding, 3- to 8-pin, also suitable for Ethernet and Profibus
• M16 power connectors: Higher current-carrying capacity of up to 16A, robust design for harsh industrial environments
• 7/8″ connector: American standard for power supply, up to 30A at 600V AC/DC
• Solenoid valve connector: In accordance with DIN EN 175301-803, types A and B, with LED status indicator and interference suppression diode
• Pre-assembled cables: Ready-made connection cables in standard lengths of 2m, 5m and 10m, with connectors at both ends

Areas of application

Mechanical Engineering and Automation

In manufacturing automation, M12 connectors link sensors, photoelectric sensors and proximity switches to the control system. A-coded connectors are used for standard sensor/actuator cabling, whilst D-coded variants are used for Industrial Ethernet. IP67 protection ensures reliable operation even when in contact with cooling lubricants.

Drive technology

Servo motors and frequency converters require interference-resistant connections for power and signals. Shielded M23 circular connectors carry motor currents of up to 40A, whilst separate M12 connectors carry the encoder signals. Push-pull locking enables quick motor changes during format changes.

Process automation

In process engineering systems, connectors often have to withstand aggressive media and temperature fluctuations. Stainless steel versions with an IP68 protection rating are suitable for outdoor applications, whilst ECOLAB-certified variants can withstand cleaning processes in the food industry.

Designs and standards

The IEC 61076 standard defines the mechanical dimensions and electrical parameters of the most common sizes. M12 connectors comply with IEC 61076-2-101, whilst M8 versions are specified in IEC 61076-2-104. This standardisation ensures compatibility between different manufacturers – such as Binder or Neutrik.

The protection rating classification in accordance with IEC 60529 ranges from IP40 for protected control cabinets to IP68 for continuous submersion. Coding prevents incorrect connections: A-coding for standard sensors, B for Profibus, D for Profinet/Ethernet, and X-coding for high-speed Ethernet connections up to 10 Gbit/s.

Special applications require additional certifications. Designs compliant with medical technology standards in accordance with ISO 10993 ensure biocompatibility, whilst explosion-proof variants are used in potentially explosive atmospheres in the chemical and petrochemical industries.

B2B purchasing at E.Hartner

As a wholesaler, E.Hartner offers volume-based tiered pricing for industrial customers. The Vienna warehouse stocks standard connector types for immediate availability. For larger projects or custom designs, the technical team provides support in selecting suitable components.