ASTAT XL User Manual
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80
DET-812
13.7
UL Fuse Selection and Short Circuit Ratings
Two Short Circuit Current Ratings (SCCR) are available for UL compliant applications.
•
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).
•
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
600V
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
QLxxB0023D 23
65kA
25 (J)
10kA AJT25
A070URD30XXX0063
n/a
QLxxB0043D 43
65kA
50 (J)
10kA AJT50
A070URD30XXX0125
QLxxB0050D 50
65kA
50 (J)
10kA AJT50
A070URD30XXX0125
QLxxB0053D 53
65kA
60 (J)
10kA AJT60
A070URD30XXX0125
QLxxB0076D 76
65kA
80 (J)
10kA AJT80
A070URD30XXX0200
QLxxB0097D 97
65kA
100 (J)
10kA AJT100
A070URD30XXX0200
QLxxB0100D 100
65kA
100 (J)
10kA AJT100
A070URD30XXX0200
QLxxB0105D 105
65kA
125 (J)
10kA AJT125
A070URD30XXX0315
QLxxB0145D 145
65kA
150 (J)
18kA AJT150 / RK5 200 A070URD30XXX0315
QLxxB0170D 170
65kA
175 (J)
18kA AJT175 / RK5 200 A070URD30XXX0315
QLxxB0200D 200
65kA
200 (J)
18kA AJT200 / RK5 300 A070URD30XXX0450
QLxxB0220D 220
65kA
250 (J)
18kA AJT250 / RK5 300 A070URD30XXX0450
QLxxB0255D 255
65kA
225 (J)
18kA †
-
18kA –
3 cycles
QLxxB0350D 350
65kA
225 (J)
18kA †
-
QLxxB0425D 425
65kA
350 (J)
30kA †
A070URD33XXX0630
30kA –
3 cycles
QLxxB0500D 500
65kA
600 (J)
30kA 600, Class J
A070URD33XXX0700
QLxxB0580D 580
65kA
800 (L)
30kA 800, Class L
-
QLxxB0700D 700
65kA
800 (L)
42kA 800, Class L
-
42kA –
3 cycles
QLxxB0820D 820
65kA
1200 (L)
42kA 1200, Class L
A070URD33XXX1000
QLxxB0920D 920
65kA% 1200 (L)
85kA 1200, Class L
A070URD33XXX1400
QLxxB1000D 1000
65kA% 1200 (L)
85kA 1200, Class L
A070URD33XXX1400
QLxxX0255D 255
65kA
200(J)
18kA AJT300
A070URD30XXX0450
n/a
QLxxX0360D 360
65kA
400 (J)
18kA AJT400 / RK5 500 A070URD33XXX0630
QLxxX0380D 380
65kA
450 (J)
18kA AJT450 / RK5 500 A070URD33XXX0700
QLxxX0430D 430
65kA
450 (J)
30kA AJT450
A070URD33XXX0700
QLxxX0620D 620
65kA
800 (L)
42kA A4BQ800
A070URD33XXX1000
QLxxX0650D 650
65kA
800 (L)
42kA A4BQ800
A070URD33XXX1000
QLxxX0790D 790
65kA
1200 (L)
42kA A4BQ1200
A070URD33XXX1400
QLxxX0930D 930
65kA
1200 (L)
42kA A4BQ1200
A070URD33XXX1400
QLxxX1200D 1200
65kA
1600 (L)
85kA A4BQ1600
A065URD33XXX1800
QLxxX1600D 1600
65kA
2000 (L)
85kA A4BQ2500
A050URD33XXX2500
XXX = blade type. See Ferraz/Mersen catalog for details.