IEC 60309-4-2021 pdf download.Plugs, fixed or portable socket-outlets and appliance inlets for industrial purposes – Part 4: Switched socket-outlets with or without interlock.
Clause 1 of IEC 60309-1 :2021 or of IEC 60309-2:2021 applies as follows:
Replace the first two paragraphs by the following:
This part of IEC 60309 applies to self-contained products primarily intended for industrial use, either indoors or outdoors that combine the following items within a single enclosure:
– a fixed or portable socket-outlet according to IEC 60309-1 or IEC 60309-2 with a rated operating voltage not exceeding 1 000 V DC or 1 000 V AC with a frequency not exceeding 500 Hz and a rated current not exceeding 800 A;
– a switching device.
These products can incorporate an interlock and/or protective devices.
These accessories are intended to be installed by instructed persons or skilled persons only.
2 Normative references
Clause 2 of IEC 60309-1 :2021 applies except as follows:
Additional normative references:
IEC 60073, Basic and safety principles for man-machine interface, marking and identification
– Coding principles for indicators and actuators
IEC 60309-1 :2021 , Plugs, fixed or portable socket-outlets and appliance inlets for industrial purposes – Part 1: General requirements
IEC 60309-2:2021 , Plugs, fixed or portable socket-outlets and appliance inlets for industrial purposes – Part 2: Dimensional compatibility requirements for pin and contact-tube accessories
IEC 6061 7, Graphical symbols for diagrams (available at http://std.iec.ch/iec6061 7)
IEC 60947-1 :2020, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-3, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units
IEC 60947-4-1 , Low-voltage switchgear and controlgear – Part 4-1: Contactors and motor- starters – Electromechanical contactors and motor-starters
IEC 60947-5-1 , Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices and switching elements – Electromechanical control circuit devices
IEC 61 058-1 , Switches for appliances – Part 1: General requirements
3 Terms and definitions
Clause 3 of IEC 60309-1 :2021 or of IEC 60309-2:2021 applies except as follows:
Terms and definitions 3.6 to 3.9 do not apply.
Add the following terms and definitions:
3.401 switched socket-outlet
product (interlocked or non-interlocked) containing in a single enclosure a switching device and a socket-outlet, intended to be used in combination
3.402 interlocked socket-outlet
socket-outlet associated with an interlock
3.403 switching device
device designated to make or break the current in one or more electric circuits
[SOURCE IEC 60050-441 :1 984, 441 -1 4-01 ]
3.403.1 mechanical switching device
switching device designed to close and open one or more electric circuits by means of separable contacts
[SOURCE: IEC 60050-441 :1 984, 441 -1 4-02, modified – The note has been omitted.]
3.403.1 .1 (mechanical) switch
mechanical switching device capable of making, carrying and breaking currents under normal circuit conditions which may include specified operating overload conditions and also carrying for a specified time currents under specified abnormal circuit conditions such as those of short-circuit
Note 1 to entry: A switch may be capable of making, but not breaking short-circuit currents.
[SOURCE: IEC 60050-41 1 :1 984, 441 -1 4-1 0]
3.403.1 .2 switch-disconnector switch which, in the open position, complies with the requirements specified for the isolating function
[SOURCE: IEC 60050-41 1 :1 984, 441 -1 4-1 2, modified – Reference made to the isolating function instead of to the requirements specified for a disconnector.]