Sealed Enclosures - Danfoss VLT Pocket Manual

Sealed enclosures: Can soft starters be installed
in sealed enclosures?
Soft starters can be installed in sealed enclosures, provided the
ambient temperature within the enclosure will not exceed the soft
starter's rated temperature.
All heat generated within the enclosure must be dissipated, either by
ventilation or through the enclosure's walls. This includes heat not only
from the soft starter but also from other components such as fuses,
cabling and switchgear. Heating from the soft starter can be minimised
by installing the starter in a bypassed confi guration. To minimise
external heating, protect the enclosure from direct sunlight.
WinStart includes a function to help design enclosure ventilation.
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34 VLT Soft Starter Pocket Guide