IEC 60309-4-2021 Plugs, fixed or portable socket-outlets and appliance inlets for industrial purposes – Part 4: Switched socket-outlets with or without interlock. 5 Standard ratings Clause 5 of IEC 60309-1 :2021 applies for products incorporating socket-outlets according to IEC 60309-1 . Clause 5 of IEC 60309-2:2021 applies with the following addition for products incorporating socket-outlets according to IEC 60309-2:2021 . Add the following at the end of 5.201: For switched socket-outlets with or without interlock according to 6.401 , the whole unit can have a different degree of protection but not lower than IP44 (see also 8.1 ). 6 Classification of accessories Clause 6 of IEC 60309-1 :2021 or of IEC 60309-2:2021 applies except as follows: 6.1 Replacement: According to purpose: – fixed socket-outlets, – portable socket-outlets. 6.5 Not applicable. Additional subclauses: 6.401 According to switching devices and interlock facilities: – products with a switching device and without an interlock; – products with a switching device and with an interlock. 6.402 According to the operation of the interlock/switching device: – manually; – automatically (electrically and/or electronically); – combination of the above. NOTE Inserting the plug is not considered a manual operation of the interlock/switching device. 6.403 According to the mechanical switching device: – switch; – switch-disconnector; – contactor; – other devices with suitable switch rating. 6.404 According to suitability for isolation of the switching device: – suitable for isolation; – not suitable for isolation. 6.405 According to whether the interlock system has a latching device: – with latching device (mechanical interlock); – without latching device (electrical interlock). 6.406 According to the presence of a protective device: – with protective device; – without protective device. 7 Marking Clause 7 of IEC 60309-1 :2021 or of IEC 60309-2:2021 applies except as follows: 7.1 Add the following items to the list: i) indication of the open and closed position of the switching device for products with isolating function according to 6.404; j) indication of the type of switching device. 7.4 Not applicable. 7.5 Replacement: The neutral terminal, if any, shall be marked N. The earth terminal, if any, shall be marked (preferred) IEC 6041 7-501 9 (2006-08) or IEC 6041 7-501 7 (2006-08). The relationship between the terminals for the supply cable and load terminals / load contacts shall be made clear, if necessary, by means of a diagram or instruction. Additional marking to indicate neutral terminal and/or earthing terminal may be used...
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