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Digistart IS User Guide 7
Issue: 4 www.controltechniques.com
2. Rating Data
2.1 Model code
Figure 2-1 Model code explanation
B = Internal
N = Non-bypassed
4 = 200 to 440 Vac (± 10%)
6 = 380 to 600 Vac (± 10%) or 380 to 690 Vac
(± 10% for grounded star supply system only)
Digistart IS can only be used on 690V IT supply equipped with surge protectors. Please contact Control Techniques or
your local distributor.
2.2 Current ratings
Contact your local supplier for ratings under operating conditions not covered by these ratings charts.
2.2.1 Current ratings for bypass operation
AC53b utilisation code
The AC53b utilisation code defines the current rating and standard operating conditions for a bypassed soft starter (internally
bypassed, or installed with an external bypass contactor).
The soft starter’s current rating determines the maximum motor size it can be used with. The soft starter's rating depends on the
number of starts per hour and the length and current level of the start.
The soft starter’s current rating is only valid when used within the conditions specified in the utilisation code. The soft starter may
have a higher or lower current rating in different operating conditions.
Figure 2-2 AC53b utilisation code
Start current (multiple of motor full load current)
Starter current rating (amperes)
Starter current rating: The full load current rating of the soft starter given the parameters detailed in the remaining sections of the
utilisation code.
Start current: The maximum available start current.
Start time: The maximum allowable start time.
Off time: The minimum allowable time between the end of one start and the beginning of the next start.
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