27
VersiStart i III
Model
SCR I
2
t (A
2
s)
Supply Voltage
< 440 VAC
Supply Voltage
< 575 VAC
Supply Voltage
< 690 VAC
VS i III 430N
320000
AJT450
AJT450
VS i III 500
320000
AJT500
AJT500
VS i III 580
781000
A4BQ800
A4BQ800
VS i III 620N
1200000
A4BQ800
A4BQ800
VS i III 650N
1200000
A4BQ800
A4BQ800
VS i III 700
781000
A4BQ800
A4BQ800
VS i III 790N
2530000
A4BQ1200
A4BQ1200
VS i III 820
1200000
A4BQ1200
A4BQ1200
VS i III 920
2530000
A4BQ1200
A4BQ1200
VS i III 930N
4500000
A4BQ1200 / A4BT1100
A4BQ1200 / A4BT1100
VS i III 1000
2530000
A4BQ1200
A4BQ1200
VS i III 1200N
4500000
A4BQ1600
A4BQ1600
VS i III 1410N
6480000
A4BQ2000
A4BQ2000
VS i III 1600N
12500000
A4BQ2500 / A4BT1800
A4BQ2500 / A4BT1800
7.7.7
UL Fuse Selection and Short Circuit Ratings
Two Short Circuit Current Ratings (SCCR) are available for UL compliant applications.
x
Standard Fault Currents ( @ 600 VAC circuits)
The standard fault currents are determined with reference to UL508, section 51, table 51.3. This specifies the short circuit current that
the starter must withstand based upon the soft starter model horsepower rating (or Full Load Current (FLC) rating or Locked Rotor Amps
(LRA) depending upon model).
If using the Standard Fault Current Ratings, the fuse used must be in accordance with the information in the table below (i.e. model and
manufacture specific).
x
High Available Fault Currents ( @ 480 VAC circuits)
It is possible to specify short circuit current ratings exceeding the minimum ratings set by the Standard Fault Currents (see above) when
the soft starter is capable of withstanding the high available short circuit current in accordance with the UL 508 test.
If using the High Available Fault Current Ratings, then a suitable fuse may be selected based upon Amperage and Fuse Class (J or L as
applicable).
Model
Nominal
Rating (A)
Short Circuit Ratings
600 V Short
cct rating –
3 cycles †
High Available
Standard Fault Current
@ 480
VAC max.
Max. Fuse
Rating (A)
(fuse class)
@ 600
VAC
Ferraz/Mersen fuse,
Listed J, L or RK5 Class
Fuse
Ferraz/Mersen fuse, R/C
semi-conductor fuses
VS i III 23
23
65 kA
25 (J)
10 kA
AJT25
A070URD30XXX0063
Not available
VS i III 43
43
65 kA
50 (J)
10kA
AJT50
A070URD30XXX0125
VS i III 50
50
65 kA
50 (J)
10 kA
AJT50
A070URD30XXX0125
VS i III 53
53
65 kA
60 (J)
10 kA
AJT60
A070URD30XXX0125
VS i III 76
76
65 kA
80 (J)
10 kA
AJT80
A070URD30XXX0200
VS i III 97
97
65 kA
100 (J)
10 kA
AJT100
A070URD30XXX0200
VS i III 100
100
65 kA
100 (J)
10 kA
AJT100
A070URD30XXX0200
VS i III 105
105
65 kA
125 (J)
10 kA
AJT125
A070URD30XXX0315
VS i III 145
145
65 kA
150 (J)
18 kA
AJT150 / RK5 200
A070URD30XXX0315
VS i III 170
170
65 kA
175 (J)
18 kA
AJT175 / RK5 200
A070URD30XXX0315
VS i III 200
200
65 kA
200 (J)
18 kA
AJT200 / RK5 300
A070URD30XXX0450
VS i III 220
220
65 kA
250 (J)
18 kA
AJT250 / RK5 300
A070URD30XXX0450
VS i III 255
255
65 kA
350
(RK1/J)
18 kA
†
-
18 kA –
For 3 cycles
VS i III 350
350
65 kA
400 (J)
18 kA
†
-
VS i III 425
425
65 kA
450 (J)
30 kA
†
A070URD33XXX0630
30 kA –
For 3 cycles
VS i III 500
500
65 kA
600 (J)
30 kA
600, Class J
A070URD33XXX0700
VS i III 580
580
65 kA
800 (L)
30 kA
800, Class L
-
VS i III 700
700
65 kA
800 (L)
42 kA
800, Class L
-
42 kA –
For 3 cycles
VS i III 820
820
65 kA
1200 (L)
42 kA
1200, Class L
A070URD33XXX1000
VS i III 920
920
65 kA
1200 (L)
85 kA
1200, Class L
A070URD33XXX1400
VS i III 1000
1000
65 kA
1200 (L)
85 kA
1200, Class L
A070URD33XXX1400