Home  General Reference
General Reference Tech Topics
AC53 Utilisation Codes: What are they and what do they tell me about a soft starter's current rating?
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 AC53a code - the soft starter may have a higher or lower current rating in different operating conditions.
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, 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 within the conditions specified in the AC53b code - the soft starter may have a higher or lower current rating in different operating conditions.
0% of 0 voters found this FAQ useful, I found this FAQ  useful  not useful IP Ratings: What are they?
IEC 60529 specifies protection ratings for enclosures. These ratings describe the level of protection against dust and liquids entering the enclosure.
IP ratings consist of two numbers. The first number describes the protection against solid objects and the second number descibes the level of protection agains entry of liquids.
|
IP
|
Solids
|
Liquids
|
|
0
|
No protection
|
No protection
|
|
1
|
Protected against solid objects greater than 50 mm (eg accidental touching by hand).
|
Protected against vertically falling drops of water (eg condensation)
|
|
2
|
Protected against solid objects greater than 12 mm (eg fingers).
|
Protected against direct sprays of water up to 15° from vertical.
|
|
3
|
Protected against solid objects greater than 2.5 mm (eg tools or wires).
|
Protected against sprays of water up to 60° from vertical.
|
|
4
|
Protected against solid objects greater than 1 mm (eg tools and small wires).
|
Limited protection against water sprayed from all directions (limited ingress permitted).
|
|
5
|
Limited protection against dust (some ingress but no harmful deposit).
|
Limited protection against low pressure jets of water from all directions (limited ingress permitted).
|
|
6
|
Complete protection against dust.
|
Protected against strong jets of water (limited ingress permitted).
|
|
7
|
|
Protected against the effects of immersion in water between 15 cm and 100 cm.
|
|
8
|
|
Protected against extended immersion in water under pressure.
|
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful NEMA Ratings : What are they?
NEMA 250 is a product standard that addresses many aspects of enclosure design and performance.
| |
Protection against solid objects |
Approx IP equivalent
|
|
1
|
Indoor, protection from contact.
|
IP23
|
|
2
|
Indoor, limited protection from dirt and water.
|
IP30
|
|
3
|
Outdoor, some protection from rain, sleet, windblown dust and ice.
|
IP64
|
|
3R
|
Outdoor, some protection from rain, sleet and ice.
|
IP32
|
|
4
|
Indoor or outdoor, some protection from windblown dust, rain, splashing water, hose-directed water and ice.
|
IP66
|
|
4X
|
Indoor or outdoor, some protection from corrosion, windblown dust, rain, splashing water, hose-directed water and ice.
|
IP66
|
|
6
|
Indoor or outdoor, some protection from ice, hose-directed water, entry of water when submerged at limited depth.
|
IP67
|
|
12
|
Indoor, protection from dust, falling dirt and dripping non-corrosive liquids.
|
IP55
|
|
13
|
Indoor, protection from dust, spraying water, oil and non-corrosive liquids.
|
IP65
|
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful Typical Motor FLCs
|
kW
|
HP
|
230V
|
400V
|
440V
|
500V
|
690V
|
|
7.5
|
10
|
27
|
15.5
|
13.7
|
12
|
8.9
|
|
11
|
15
|
39
|
22
|
20.1
|
18.4
|
14
|
|
15
|
20
|
52
|
30
|
26.5
|
23
|
17.3
|
|
18.5
|
25
|
64
|
37
|
32.8
|
28.5
|
21.3
|
|
22
|
30
|
75
|
44
|
39
|
33
|
25
|
|
25
|
35
|
85
|
52
|
45
|
39
|
30
|
|
30
|
40
|
103
|
60
|
51
|
45
|
34
|
|
37
|
50
|
126
|
72
|
64
|
55
|
42
|
|
45
|
60
|
150
|
85
|
76
|
65
|
49
|
|
55
|
75
|
182
|
105
|
90
|
80
|
61
|
|
75
|
100
|
240
|
138
|
125
|
105
|
82
|
|
90
|
125
|
295
|
170
|
146
|
129
|
98
|
|
110
|
150
|
356
|
205
|
178
|
156
|
118
|
|
132
|
180
|
425
|
245
|
215
|
187
|
140
|
|
140
|
190
|
450
|
260
|
227
|
200
|
145
|
|
147
|
200
|
472
|
273
|
236
|
207
|
152
|
|
150
|
205
|
483
|
280
|
246
|
210
|
159
|
|
160
|
220
|
520
|
300
|
256
|
220
|
170
|
|
185
|
250
|
595
|
342
|
295
|
263
|
200
|
|
200
|
270
|
626
|
370
|
321
|
281
|
215
|
|
220
|
300
|
700
|
408
|
353
|
310
|
235
|
|
250
|
340
|
800
|
460
|
401
|
360
|
274
|
|
257
|
350
|
826
|
475
|
412
|
365
|
280
|
|
280
|
380
|
900
|
510
|
450
|
400
|
305
|
|
295
|
400
|
948
|
546
|
473
|
416
|
320
|
|
300
|
410
|
980
|
565
|
481
|
420
|
325
|
|
315
|
430
|
990
|
584
|
505
|
445
|
337
|
|
335
|
450
|
1100
|
620
|
518
|
472
|
355
|
|
355
|
480
|
1150
|
636
|
549
|
500
|
370
|
|
375
|
500
|
1180
|
670
|
575
|
527
|
395
|
|
400
|
545
|
1250
|
710
|
611
|
540
|
410
|
|
425
|
580
|
1330
|
760
|
650
|
574
|
445
|
|
445
|
600
|
1400
|
790
|
680
|
595
|
455
|
|
450
|
610
|
1410
|
800
|
690
|
608
|
460
|
|
475
|
645
|
1490
|
850
|
730
|
645
|
485
|
|
500
|
680
|
1570
|
900
|
780
|
680
|
515
|
|
560
|
760
|
1750
|
1000
|
860
|
760
|
570
|
|
600
|
800
|
1875
|
1085
|
937
|
825
|
625
|
|
650
|
870
|
2031
|
1176
|
1015
|
894
|
677
|
|
700
|
940
|
2187
|
1266
|
1093
|
962
|
729
|
|
750
|
1000
|
2343
|
1357
|
1172
|
1031
|
781
|
|
800
|
1070
|
2499
|
1447
|
1250
|
1100
|
833
|
|
850
|
1140
|
2656
|
1537
|
1328
|
1168
|
885
|
|
900
|
1250
|
2812
|
1628
|
1406
|
1237
|
937
|
|
950
|
1275
|
2968
|
1718
|
1484
|
1306
|
989
|
|
1000
|
1340
|
3124
|
1809
|
1562
|
1375
|
1041
|
0% of 0 voters found this FAQ useful, I found this FAQ useful not useful
|
