Minimum clearances required on the ATS48 soft starters?
Altistart 48, ATS48
Mounting inside an enclosure
There is a minimum of 4 inches (100 mm) on the top and bottom of the softstart. A minimum clearance of 2 inches (50mm) on each sides.
The enclosure must also allow for proper ventilation to maintain a temperature of 40C (104F) and required wire bending space.