IEC 60947-4-3-2020 pdf free download

IEC 60947-4-3-2020 pdf free download.Low-voltage switchgear and controlgear — Part 4-3: Contactors and motor-starters — Semiconductor controllers and semiconductor contactors for non-motor loads.
For the dry heat test, the mechanical switching device shall be in the closed position during the conditioning period (see 5.3.3 of IEC 60068-2-2:2007). For categories A, B and C, the test may be done without current in the poles and for categories D, E and F, the test shall be done under the maximum rated current but may be limited to 100 A for practical reasons. During the last hour, the controller shall be operated 5 times.
For the low temperature test, the test Ad is to be chosen instead of the test Ab and the mechanical switching device shall be in the open position during the cooling period. It shall then be energized for the last hour. For categories A, B and C, the test may be done without current in the poles and for categories 0, E and F, the test is done under the maximum rated current which may be limited to 100 A for practical reasons. During this last hour the controller shall be operated 5 times.
For the damp heat test, for categories A, B and C, the test may be done without current in the poles. For categories D, E and F the equipment shall be energized under the maximum rated current for the first cycle and de-energized for the second cycle. The current may be limited to 100 A for practical reasons. After stabilization of the temperature, during the first 2 h of the first cycle and during the last 2 h of the second cycle, the controller shall be operated 5 times.
With the agreement of the manufacturer, the duration of the recovery periods may be reduced. After the salt mist test, the product may be washed with the manufacturer’s agreement.
9.2 Compliance with constructional requirements
9.2.1 General
Subclause 9.2 of IEC 60947-1:2020 applies with the following additions.
9.2.2 ElectrIcal performance of screwless-type clamping units
Subclause 9.2.5.7 of IEC 60947-1:2020 applies with the following additions.IEC 60947-4-3-2020 pdf free download.