10
Digistart D3: User Guide
Issue: G
2.2.2 Current Ratings for Continuous Operation (Not bypassed)
AC53a Utilisation Code
The AC53a Utilisation Code defines the current rating and standard operating conditions for a non-bypassed soft
starter.
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, the length and current level of the start, and the percentage of the
operating cycle that the soft starter will be running (passing current).
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.
351 A : AC-53a 3.5 - 15 : 50 -
6
Starts per hour
On-load duty cycle (%)
Start time (seconds)
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.
On-load duty cycle
: The maximum percentage of each operating cycle that the soft starter can operate.
Starts per hour
: The maximum allowable number of starts per hour.
In-line connection
AC53a 3-10:50-6
40 ºC <1000 metres
AC53a 3.5-15:50-6
40 ºC <1000 metres
AC53a 4-20:50-6
40 ºC <1000 metres
AC53a 4.5-30:50-6
40 ºC <1000 metres
D3-0255-N
255 A
222 A
195 A
171 A
D3-0360-N
360 A
351 A
303 A
259 A
D3-0380-N
380 A
380 A
348 A
292 A
D3-0430-N
430 A
413 A
355 A
301 A
D3-0620-N
620 A
614 A
515 A
419 A
D3-0650-N
650 A
629 A
532 A
437 A
D3-0790-N
790 A
790 A
694 A
567 A
D3-0930-N
930 A
930 A
800 A
644 A
D3-1200-N
1200 A
1200 A
1135 A
983 A
D3-1410-N
1410 A
1355 A
1187 A
1023 A
D3-1600-N
1600 A
1600 A
1433 A
1227 A
Inside delta connection
AC53a 3-10:50-6
40 ºC <1000 metres
AC53a 3.5-15:50-6
40 ºC <1000 metres
AC53a 4-20:50-6
40 ºC <1000 metres
AC53a 4.5-30:50-6
40 ºC <1000 metres
D3-0255-N
382 A
334 A
293 A
257 A
D3-0360-N
540 A
527 A
455 A
388 A
D3-0380-N
570 A
570 A
522 A
437 A
D3-0430-N
645 A
620 A
533 A
451 A
D3-0620-N
930 A
920 A
773 A
628 A
D3-0650-N
975 A
943 A
798 A
656 A
D3-0790-N
1185 A
1185 A
1041 A
850 A
D3-0930-N
1395 A
1395 A
1200 A
966 A
D3-1200-N
1800 A
1800 A
1702 A
1474 A
D3-1410-N
2115 A
2033 A
1780 A
1535 A
D3-1600-N
2400 A
2400 A
2149 A
1840 A
