Danger of fire through overheating caused by insufficient ventilation and installation Clearances 
Insufficient ventilation and installation clearances result in overheating with danger to persons as a 
result of smoke and fire. 
  Always mount the Power Module in a vertical position 
  Maintain the following clearances between the components when mounting (*): 
  Frame size FSA: 30 mm (1.18 inches) 
  Frame size FSB: 40 mm (1.57 inches) 
  Frame size FSC: 50 mm (1.96 inches) 
  Maintain the following ventilation clearances above and below the component: 
  Frame size FSB: 100 mm (3.93 inches) 
  Frame size FSC: 125 mm (4.92 inches) 
  Frame sizes FSD and FSE: 300 mm (11.81 inches) 
  Frame size FSF: 350 mm (13.77 inches) 
  Maintain the following ventilation clearances in front of the component: 
  Frame sizes FSB to FSF: 30 mm (1.18 inches) 
  Ensure that the cooling air flow of the Power Modules can flow unrestricted. 
(*)The  Power  Modules  can  be  mounted  side  by  side  without  base  components  up  to  an  ambient 
temperature of 40° C. 
In combination with base components and at ambient temperatures of 40° C to 55° C, the specified lateral 
minimum clearances must be observed. Where combinations of different frame sizes are concerned, the 
longer of the two clearances shall apply.