BENSHAW RediStart MX3 Series, User Manual

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Mounting Considerations
3.3
Mounting Considerations
3.3.1 Bypassed Starters
Provisions should be made to ensure that the average temperature inside the enclosure never rises above 50°C. If the temperature inside
the enclosure is too high, the starter can be damaged or the operational life can be reduced.
3.3.2 Non-Bypassed Starters
Provisions should be made to ensure that the temperature inside the enclosure never rises above 50°C. If the temperature inside the
enclosure is too high, the starter can be damaged or the operational life can be reduced. As a general rule of thumb, the following
ventilation guidelines can be followed.
The starter produces 4 watts of heat per amp of current and 26 square inches of enclosure surface is required per watt of heat generation.
Contact Benshaw and ask for the enclosure sizing technical note for more information concerning starters in sealed enclosures. Benshaw
supplies starters under 124 amps non-bypassed, with the heat sink protruding from the back of the enclosure. This allows a small
enclosure size while still maintaining the cooling capability of the starter.
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3 - INSTALLATION
Current Range Bottom of Enclosure Top of Enclosure
< 200 amps Fans or grills depending on enclosure size
200 to 300 amps 2 x 4” grills (12 sq. in.) 2 x 4” grills (12 sq.in.)
301 to 400 amps 1 x 4” fan (115 cfm) 2 x 4” grills (12 sq.in.)
401 to 600 amps 2 x 4” fan (230 cfm) 2 x 6” grills (28 sq.in.)
601 to 700 amps 2 x 6” fan (470 cfm) 2 x 6” grills (28 sq.in.)
> 700 amps Consult factory Consult Factory
Table 13: Ventilation Requirements