Different sizes of IEC 60309 connectors are used for different current ratings. The connectors are also keyed and color-coded to indicate their voltage and frequency range: ■ Yellow indicates carriage of 100 to 130 V at 50 to 60 Hz ■ Blue indicates carriage of 200 to 250 V at 50 to 60 Hz ■ Red indicates carriage of 380 to 480 V at 50 to 60 Hz — often in a three-phase configuration
Conclusion
There are many geometry and integration options when it comes to selecting connectors and glands for industrial automation. During the specification of a cable for a given automated piece of machinery, the first consideration for design engineers must be the cable core count and the cores’ gauges. Ingress protection and the need for a positive lock to prevent intermittent signals are the next- most important considerations.
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