System Design
3.3 Model Selection
Starter sizing
The soft starter must be the correct size for the motor and the application.
Select a soft starter that has a current rating at least equal to the motor's full load current
(nameplate) rating, at the start duty.
The soft starter's current rating determines the maximum motor size it can be used with.
The rating depends on the number of starts per hour, the length and current level of the
start, and the amount of time the soft starter will be off (not passing current) between starts.
The soft starter's current rating is only valid when used in the conditions specified in the
AC53 code. The current rating may be higher or lower in different operating conditions.
3.4 Current Ratings
Contact your local supplier for ratings under operating conditions not covered by these
ratings charts.
IEC ratings
• AC53b format (bypassed current rating)
Start current (multiple of motor full load
current)
Starter current rating (amperes)
• Ratings
All ratings are calculated at altitude of 1000 metres and ambient temperature of 40 ºC.
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