IEC 60309-4:2021 pdf free download – Plugs, fixed or portable socket-outlets and appliance inlets for industrialpurposes
12.1 Switched socket-outlets with interlocks shall be so constructed that a plug or applianceinlet cannot be completely withdrawn from the socket-outlet while the contacts of that socket-outlet are live, and the contacts of the socket-outlet cannot be made live until a plug orappliance inlet is in proper engagement.The contacts shall not open or close on load.
A pilot contact in a switched socket-outlet (interlocked or non-interlocked) may be live whennot engaged with a male pilot contact if the female contact is part of a SELV circuit or if it isnot accessible with the standard test finger according to IEC 61032,Probe B.
For products provided with an actuator,an attempt shall be made, without the complementaryaccessory inserted, to close the mechanical switching device by applying a force according to24.401.The contacts of the mechanical switching device shall not close.
This is checked by a continuity test made between the supply terminals and the contactassembly of the socket-outlet.
The time interval is checked by measuring the time interval between the instant of opening ofthe contact(s) of the control switching device or pilot contacts and the instant of opening ofthe contact of the mechanical switching device,under no-load conditions.
For 60/63 A and 100/125 A products complying with lEC 60309-2 where the control switchingdevice depends on the pilot pin and pilot contact-tube, the time interval shall not be greaterthan 35 ms.
NOTE The time interval of 35 ms is the ratio between the distances given in the standard sheets in the worstconditions and the separation speed given in Clause 20 and Clause 21.
12.3 Switched socket-outlets with interlock with latching devices locking the plug orappliance inlet into the socket-outlet (mechanical interlock) shall be so constructed that theinterlock is linked with the operation of a switching device so that the plug or appliance inletcan neither be inserted nor withdrawn from the socket-outlet while the contacts of the socket-outlet are live and the contacts of the socket-outlet cannot be made live until a plug is almostcompletely in engagement.
Without the complementary accessory inserted，an attempt shall be made to close themechanical switching device by applying a force according to 24.401.The contacts of themechanical switching device shall not close.
This is checked by a continuity test made between the supply terminals and the contactassembly of the socket-outlet.
The switched socket-outlet with interlock is fixed to the support of an apparatus as shown inFigure 401 so that the axis of separation is vertical, and the movement of the plug isdownwards. With the latching device(s) holding the test plug into the socket-outlet in theengaged position,an axial pull is applied to an appropriate test plug inserted in the switchedsocket-outlet with interlock. The test plug,according to the relevant standard sheets，shallhave finely ground contacts of hardened steel,having a surface roughness not exceeding0,8 um over their active length and spaced at the nominal distances,with a tolerance of±0,05 mm.