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68
Derating curve and parameters
Rated operating current and temperature compensation coefficient table of Ex9M(D) circuit breaker
Rated operating current and temperature compensation coefficient table of Ex9M electronic type circuit breaker
The impact of residual current protection module on the derating coefficient of circuit breaker
Note:
1)
For multiple pole DC circuit breakers, if a 2m standard cable is used for series connection, the derating coefficient in the table above are
applicable;
2)
If copper short circuit bar is used for series connection, further derating is needed based on the table above (except for Ex9MD6). User
should determine the specific derating coefficient according to its wiring method (we recommend to add a further 0.8 to the coefficient in
the table above).
Curves and Parameters
Curves and Parameters
Ambient temperature
Rated current
-35°C
-25°C
-15°C
-5°C
0°C
+10°C
+20°C
+30°C
+40°C
+50°C
+60°C
+70°C
Ex9M2
32A
32
32
32
32
32
32
32
32
32
32
32
32
63A
63
63
63
63
63
63
63
63
63
63
63
63
100A
100
100
100
100
100
100
100
100
100
100
100
100
160A.
160
160
160
160
160
160
160
160
160
160
160
160
250A
250
250
250
250
250
250
250
250
250
240
225
213
Ex9M3
250A
250
250
250
250
250
250
250
250
250
250
250
250
400A
400
400
400
400
400
400
400
400
400
380
360
340
630A
630
630
630
630
630
630
630
630
630
600
570
540
Ex9M4
630A
630
630
630
630
630
630
630
630
630
630
630
630
Ex9M5
800A
800
800
800
800
800
800
800
800
800
760
720
680
Ex9M6
800A
800
800
800
800
800
800
800
800
800
800
800
800
1000A
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1250A
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1250
1600A
1600
1600
1600
1600
1600
1600
1600
1600
1600
1520
1440
1360
Ambient temperature
Rated current
-40°C
-35°C
-25°C
-15°C
-5°C
0°C
+10°C +20°C +30°C +40°C +50°C +60°C +70°C
Ex9M(D)1
16A
22.5
22
20.5
20
19.5
19
18.5
17.5
17
16
15
14.5
14
20A
28
27.5
26.5
25.5
24.5
24
23
22
21
20
19.5
18.5
18
25A
35
34
33
32
30.5
30
28
27
26
25
24
22.5
22
32A
45
44
42
41
39
38
37
35
33
32
30.5
29
28
40A
56
55
53
51
49
48
46
44
42
40
37
33.5
29
50A
70
68.5
66
64
61
60
57.5
55
52.5
50
47.5
45
40
63A
88
86.5
83
80
77
75
72
69
66
63
58.5
53
46
80A
112
110
106
102
98
96
92
88
84
80
74.5
67
56
100A
140
137
132
127
122
120
115
110
105
100
93
84
80
125A
175
172
165
159
153
150
144
137
131
125
116
105
91
160A.
224
220
212
204
196
192
184
176
168
160
149
135
117
Ex9M(D)2
125A
175
172
165
159
153
150
144
137
131
125
118
106
96
160A.
224
220
212
204
196
192
184
176
168
160
152
136
120
180A
252
247
238
229
220
216
207
198
189
180
171
157
144
200A
280
275
265
255
245
240
230
220
210
200
190
175
166
225A
315
309
300
288
276
270
259
247
236
225
213
196
180
250A
350
343
332
319
306
300
287
275
262
250
237
218
207
Ex9M(D)3
250A
350
343
332
319
306
300
287
275
262
250
237
225
212
315A
441
433
418
402
386
378
362
346
331
315
300
286
271
350A
490
481
465
447
429
420
402
385
367
350
332
295
276
400A
560
550
530
510
490
480
460
440
420
400
380
360
320
500A
700
687
662
637
612
600
575
550
525
500
450
406
360
Ex9M(D)4
400A
560
550
530
510
490
480
460
440
420
400
390
370
320
500A
700
687
662
637
612
600
575
550
525
500
490
460
400
630A
882
866
836
804
772
756
724
693
661
630
580
530
490
Ex9M(D)5
630A
882
866
836
804
772
756
724
693
661
630
580
530
490
700A
980
962
927
892
857
840
805
770
735
700
670
645
575
800A
1120
1100
1060
1020
980
960
920
880
840
800
735
670
625
Ex9M(D)6
800A
1120
1100
1060
1020
980
960
920
880
840
800
760
696
640
1000A 1400
1375
1325
1275
1225
1200
1150
1100
1050
1000
950
870
800
1250A
1750
1718
1656
1594
1531
1500
1437
1375
1312
1250
1187
1088
1000
1600A
2240
2200
2120
2040
1960
1920
1840
1760
1680
1600
1520
1390
1280
Model
Current specification (A)
Derating coefficient
Ex9M1 TM+Ex9ML1
16-20-25-32-40-50
1
63
1
80
0.9
100
0.9
125
0.8
160
0.82
Ex9M2 TM+Ex9ML2
125-160
1
180
1
200
0.9
225
0.9
250
0.9
Ex9M3 TM+ Ex9ML3
250
1
315
0.96
350
0.96
400
0.93
500
0.87
Ex9M2 SU20+ Ex9ML2
32
、
63
1
100
1
160
1
250
0.95
Ex9M3 SU20+ Ex9ML3
250
1
400
1
630
0.9
Note:
Some products need to be derated at temperature of 50° C and above (see parameter table), and Ir should be adjusted accordingly.
For example:
If Ex9M2 N SU20L 250 3P is used at 70° C, user should derated the product to 213A and adjust Ir to 0.8In,
If Ex9M2 N SU20S 250 3P is used at 70° C, user should derated the product to 213A and adjust Ir to 213A.