What constitutes a heavy-duty connector and where are they used for industrial connectivity
Will the heavy-duty connector be installed in settings where flammability is a concern? The number of pins and the voltage and current to be carried by each must also be considered — along with the direction of cable entry and level of cable protection. On automated machines that subject the cables and their connectors to movement, suitable glands, and cable clamps must be provided … and anti-twist devices may also be prudent. For electrical loads that are relatively light but operating in harsh environments, M-series connectors and their derivatives are often suitable choices. For higher electrical loads, rectangular connectors may be better a better solution … especially as they can be configured to suit just about any complex requirement with various cable-entry directions, mounting options, and generally modular builds. Otherwise, for simple power connections to a single or three- phase ac supply, IEC 60309 locking industrial connectors are the leading (if not the only) choice.
■ Blue indicates the IEC 60309 power connector is suitable for carrying 200 to 250 V at 50 or 60 Hz. ■ Red indicates the IEC 60309 power connector is suitable for carrying 380 to 480 V at 50 or 60 Hz … often in a three-phase configuration.
Conclusion Heavy-duty connectors must satisfy various requirements. Will the connector need to resist crushing from impact loads — or being pulled apart? Is ingress protection against dust or water needed? What temperatures will the connector need to withstand?
Figure 5: This red color-coded heavy-duty connector satisfies the IEC 60309 standard for supplying 380 to 480 V. (Image source: Wikimedia Commons )
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