for industrial connectors, obtaining a reliable connection (and rated ingress-protection level) depends on the technician correctly tightening the connector thread. Some connector suppliers have aimed to address even this potential failure point by selling push-fit connectors that automatically lock. Perhaps the most established of these is the Molex Brad series of connectors, which are a direct replacement for standard M12 connectors. These omit the threaded sleeve for a reliable push-to-lock mechanism … so simply pressing the connector halves together ensures perfect locking and a reliable connection without risk of intermittent signals or disconnection. These connectors are available in various configurations and include push-on and pull-off connectors with IP65 protection. When used for Ethernet applications, M-series and Molex Brad connectors can also carry power using the Power over Ethernet (PoE) standards in three configurations — Alternative A, Alternative B, and 4PPoE — to support varying levels of bandwidth and power capacity. IEC power connectors for high-power requirements The International Electrotechnical Commission (IEC) defines various standards for power connectors used in domestic, commercial,
Figure 4: Ultra-Lock connectors are a push to lock option with O-rings to provide foolproof connections and IP69K ingress protection. (Image source: MOLEX)
and industrial applications. For example, IEC 60320 covers non- locking connectors with voltages and currents up to 250 V and 16 A respectively. These include large but nonruggedized C13/C14 as well as larger C19/C20 couplers common on electronic equipment
connectors provide some degree of ingress protection with standard configurations proving splashproof IP44, waterproof IP67, or jet proof and waterproof IP66/67 protection.
The standard also allows for interlocked socket outlets:
Connectors with this feature don’t allow energization unless mated with a plug … and the plug can’t be removed until the power is switched off. The following color coding indicates the allowable voltage and frequency range for the connector. ■ Yellow indicates the IEC 60309 power connector is suitable for carrying 100 to 130 V at 50 or 60 Hz.
for industrial applications — including computer power
supplies and server enclosures. These couplers aren’t normally considered heavy-duty connectors. In contrast, IEC 60309 locking connectors are ruggedized — and intended for use on industrial cables that transmit voltages and currents up to 1,000 V and 800 A respectively. All IEC 60309 locking
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