In brief
An industrial connector is a robust, detachable electrical connection for power, signals or data in machines, plants and control cabinets.
Contents
What is Industrial connector?
Industrial connectors differ from appliance plugs in their mechanical robustness, locking and protection against dust and water. They make it possible to connect sensors, drives or entire machine modules quickly and to disconnect them again during repair or conversion without rewiring individual cores.
Common types are small circular connectors with M8 or M12 threads for sensors and data transmission, and rectangular connectors with housings and interchangeable contact inserts for power and signals. Important parameters are number of poles, rated voltage and current, coding, connection technology (crimp, screw or spring-loaded terminal), conductor cross-section, IP rating and temperature range. Coding prevents incorrect mating; with M12, for example, it separates sensor, power and Ethernet variants.
Typical causes of failure are corroded or widened contacts, aged seals, broken locking mechanisms and tensile load at the cable outlet. Because housing, insert and contacts are often ordered separately, a complete designation of each component is decisive for a replacement. For procurement, it pays to standardise connectors across plants. Fewer designs and codings mean fewer stock items, less risk of mix-ups and faster replacement when faults occur at sensors or drives.
In practice: maintenance and procurement
For a replacement enquiry, the design, number of poles, coding, male or female side, connection technology, conductor cross-section and the manufacturer part numbers of housing and insert should be available. A photo of the mating face with the coding visible avoids mix-ups.
Synonyms and abbreviations: M12 connector · circular connector · rectangular connector · heavy-duty connector
Frequently asked questions
What does the coding on M12 connectors mean?
The coding is a mechanical shape in the mating face that only accepts matching counterparts. There are several codings for M12, for example for sensors and actuators, for power supply and for Ethernet data lines. This prevents a data cable from being plugged into a power socket by mistake. When replacing, the coding must match exactly, otherwise the connector will not fit.
What information is needed to replace an industrial connector?
Needed are design and size, number of poles, coding, male or female version, connection technology and conductor cross-section, as well as the required IP rating. For rectangular connectors, housing, contact insert and contacts must be specified separately. The manufacturer part number of each component and a photo of the mating face make unambiguous identification easier.
What is the difference between crimp and screw connections?
With a crimp connection, the contact is permanently pressed onto the conductor with a special tool; this is fast, vibration-resistant and reproducible but requires the right tool. With a screw connection, the conductor is secured with a clamping screw and can be fitted without special tools. Spring-loaded connections are a third variant that requires few tools.
What IP rating do connectors in production need?
That depends on the location. In the control cabinet, a low level of protection is often sufficient; on the machine, with coolant, dust or cleaning, IP65, IP67 or higher is usually required. The IP rating only applies when the connector is mated and locked; open sockets need protective caps.