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Supersedes Data Bulletin 240-190 dated 12-19-88 2005
S&C ELECTRIC COMPANY
DATA BULLETIN 240-190
Page 1 of 4
June 20, 2005
S&C Power Fuses Continuous, Daily, and Emergency
Types SM, SML, SME, SMD-20, and SMD-40
Peak-Load Capability
Indoor and Outdoor Distribution (4.16 kV through 34.5 kV)
In accordance with procedures described in ANSI Stan-
dard C37.41-1981, minimum melting time-current charac-
teristic curves for S&C power fuses are based on tests
starting at no initial load. When in service, of course, every
fuse will be carrying a load that may approach or even
exceed the ampere rating. This preloading reduces theheat-dissipating ability of the fusible element, and hence
reduces its melting time. This effect has been minimized in
S&C power fuses by designing their fusible elements to
melt at current levels not less than 200% of rating.
Nonetheless, precise coordination of power fuses
with other power fuses or with circuit breakers or auto-
matic circuit reclosersrequires that the published melt-
ing times be adjusted for the most severe anticipated
condition of preload. The preloading adjustment factors
are shown in S&C Data Bulletin 240-195. These preloading
adjustment factors are to be used with S&C power fuses
only, since the derivation of these factors is dependent
upon not only the element construction but also the rela-
tionship of the minimum melting current to the ampererating of the fuse.
The excessive preloading produced by peak loads
approaching the values listed in these tables causes a
reduction in melting time by as much as 60% of the pub-
lished values. In transformer-primary fusing applications
where the principal objectives are maximum transformer
protection and maximum backup protection for second
ary-side equipment and circuits, it may be expedient to
forego complete coordination with other protective
devices for the duration of such peak-load conditions.Although higher peak-load values than those shown in
italics could have been listed, such extreme overloading
while not damaging to the fusesshould be avoided to
insure against unnecessary fuse blowing due to momen
tary surges during such overload conditions. A trans
former primary fuse is selected to accommodate
not to
interrupt
peak loads.
All peak-load capability values are based on 70% pre
load and 30C ambient temperature. Peak-load capability
is increased 0.5% for each degree of ambient temperature
below 30C, and decreased 0.5% for each degree of ambi
ent temperature above 30C.
The emergency peak-load capability values not shownin italics represent the maximum nonrepetitive load that
the fuse will carry without impairing its ability to perform
properly. In no event should the fuse be subjected to this
level of load more than twice a year.
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S&C ELECTRIC COMPANY
240-190DATA BULLETIN
Page 2 of 4
June 20, 2005
S&C Power Fuses Continuous, Daily, and Emergency
Types SM, SML, SME, SMD-20, and SMD-40
Peak-Load Capability
Indoor and Outdoor Distribution (4.16 kV through 34.5 kV)
SM-4 REFILL UNITSS&C STANDARD SPEED AND S&C SLOW SPEED (TCC No. 153-4 and 119-4)
RatingAmperes
Peak-Load Capability, Amperes
Continuous
Daily Emergency
Time,Hours
1 2 4 8
1 2 4 8
3E5E7E
10E13E15E20E25E30E40E50E65E80E
100E125E150E175E
200E
4.2
7.5
10.5
15.0
19.5
22.5
30.0
37.5
45.0
577090
110118137158180
200
4.2
8.2
11.5
16.5
21.4
24.7
33.0
41.0
49.0
6378
100124136156180203
210
4.2
8.0
11.2
16.1
21.0
24.2
32.2
40.0
48.0
617698
120129148174195
204
4.2
7.8
11.0
15.7
20.6
23.6
31.4
40.0
47.0
607496
118126143167187
200
4.2
7.7
10.8
15.5
20.2
23.2
31.0
39.0
46.0
597394
116123140162184
200
4.2
7.6
10.6
15.2
19.6
22.8
30.4
38.0
46.0
587292
114121138160182
200
4.2
8.2
11.5
16.5
21.4
24.7
33.0
41.0
49.0
6682
107130160200225250
260
4.2
8.0
11.2
16.1
21.0
24.2
32.2
40.0
48.0
6481
105128150175200227
240
4.2
7.8
11.0
15.7
20.6
23.6
31.4
40.0
47.0
6379
102125142162185208
226
4.2
7.7
10.8
15.5
20.2
23.2
31.0
39.0
46.0
6278
100124137152175197
216
4.2
7.6
10.6
15.2
19.6
22.8
30.4
38.0
46.0
617698
122132148168190
210
SM-5 REFILL UNITSS&C STANDARD SPEED AND S&C SLOW SPEED (TCC No. 153-4 and 119-4)
RatingAmperes
Peak-Load Capability, Amperes
Continuous
Daily Emergency
Time,Hours
1 2 4 8
1 2 4 8
3E5E7E
10E13E15E20E25E30E40E50E65E80E
100E125E150E175E
200E250E300E400E
4.2
8.0
11.2
16.0
20.8
24.0
32.0
40.0
48.0
64
80
104
120150175187205
225250300400
4.2
8.5
11.5
16.5
21.4
25.5
34.0
42.5
51
68
85
111
128160197225250
270290375440
4.2
8.0
11.4
16.4
21.3
25.0
33.5
42.0
50.2
67
84
109
125156190212234
254270330410
4.2
8.0
11.3
16.2
21.2
24.7
33.0
41.2
49.5
66
83
108
124154186204224
244260320407
4.2
8.0
11.2
16.1
21.0
24.4
32.6
40.8
49.0
65
82
107
123153183200217
238257310403
4.2
8.0
11.2
16.0
20.9
24.2
32.3
40.4
48.5
6581
106
122152180195213
234255306400
4.2
8.5
11.5
16.5
21.4
25.5
34.0
42.5
51
68
85
111
130163204231260
280300390460
4.2
8.0
11.4
16.4
21.3
25.0
33.5
42.0
50.2
67
84
109
128159198217240
260280350427
4.2
8.0
11.3
16.2
21.2
24.7
33.0
41.2
49.5
66
83
108
126158194208228
250267335425
4.2
8.0
11.2
16.1
21.0
24.4
32.6
40.8
49.0
65
82
107
125157191204222
246264330424
4.2
8.0
11.2
16.0
20.9
24.2
32.3
40.4
48.5
65
81
106
124157189202221
243260320422
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S&C ELECTRIC COMPANY
DATA BULLETIN
240-190
Page 3 of 4
June 20, 2005
SMU-20 FUSE UNITSS&C K SPEED (TCC No. 165-2)
RatingAmperes
Peak-Load Capability, Amperes
Continuous
Daily Emergency
Time,Hours
1 2 4 8
1 2 4 8
3K6K8K
10K12K15K20K25K30K40K50K65K80K
100K140K200K
4.2
9.7
13.0
16.2
19.4
24.3
32.4
40.5
48.6
54
80
92
114126160212
4.2
10.2
13.5
17.0
20.4
25.5
34.0
42.5
51
63
85
106
132144186248
4.2
10.1
13.4
16.8
20.2
25.2
33.6
42.0
50.5
61
84
103
128140180240
4.2
10.0
13.3
16.6
20.0
24.9
33.2
41.5
50.0
59
83
100
124136174232
4.2
9.9
13.2
16.4
19.8
24.6
32.8
41.0
49.5
57
82
97
120132168224
4.2
9.8
13.1
16.2
19.6
24.3
32.4
40.5
49.0
55
81
94
116128162216
4.2
10.2
13.5
17.0
20.4
25.5
34.0
42.5
51
65
85
110
136150190250
4.2
10.1
13.4
16.8
20.2
25.2
33.6
42.0
50.5
63
84
107
132146185245
4.2
10.0
13.3
16.6
20.0
24.9
33.2
41.5
50.0
61
83
104
128142180240
4.2
9.9
13.2
16.4
19.8
24.6
32.8
41.0
49.5
59
82
101
124138175235
4.2
9.8
13.1
16.2
19.6
24.3
32.4
40.5
49.0
57
81
98
120134170230
SMU-20 FUSE UNITSS&C STANDARD SPEED AND S&C SLOW SPEED (TCC No. 153-2 and 119-2)
RatingAmperes
Peak-Load Capability, Amperes
Continuous
Daily Emergency
Time,Hours
1 2 4 8
1 2 4 8
5E7E
10E13E15E20E25E30E
40E50E65E80E
100E125E150E175E200E
7.0
11.3
16.2
21.1
24.0
32.0
40.0
46.0
54
78
90
112126148175192202
7.0
11.9
17.0
22.1
25.5
34.0
42.5
51
63
85
105
130144172203220230
7.0
11.8
16.8
21.8
25.2
33.6
42.0
50.0
61
84
102
126140167197214224
7.0
11.7
16.6
21.5
24.9
33.2
41.5
49.0
59
83
99
122136162191208218
7.0
11.6
16.4
21.2
24.6
32.8
41.0
48.0
57
82
96
118132157185202212
7.0
11.5
16.2
20.9
24.3
32.4
40.5
47.0
55
81
93
114128152179196206
7.0
11.9
17.0
22.1
25.5
34.0
42.5
51
65
85
110
136151180211225241
7.0
11.8
16.8
21.8
25.2
33.6
42.0
50.0
63
84
107
132147175205220235
7.0
11.7
16.6
21.5
24.9
33.2
41.5
49.0
61
83
104
128143170199215229
7.0
11.6
16.4
21.2
24.6
32.8
41.0
48.0
59
82
101
124139165193210223
7.0
11.5
16.2
20.9
24.3
32.4
40.5
47.0
57
81
98
120135160187205217
SMU-20 FUSE UNITSS&C VERY SLOW SPEED (TCC No. 176-2)
RatingAmperes
Peak-Load Capability, Amperes
Continuous
Daily Emergency
Time,Hours
1 2 4 8
1 2 4 8
50E65E80E
100E125E150E175E200E
81
98
110118158178196200
85
108
128136180200220220
84
106
124132175195215215
83
104
120128170190210210
82
102
116124165185205205
81
100
112120160180200200
85
110
134142190210230235
84
109
130138185205225230
83
108
126134180200220225
82
107
122130175195215220
81
106
118126170190210215
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S&C ELECTRIC COMPANY
240-190DATA BULLETIN
Page 4 of 4
June 20, 2005
S&C Power Fuses Continuous, Daily, and Emergency
Types SM, SML, SME, SMD-20, and SMD-40
Peak-Load Capability
Indoor and Outdoor Distribution (4.16 kV through 34.5 kV)
SMU-40 FUSE UNITSS&C STANDARD SPEED AND S&C SLOW SPEED (TCC No. 153-2 and 119-2)
RatingAmperes
Peak-Load Capability, Amperes
Continuous
Daily Emergency
Time,
Hours
1 2 4 8
1 2 4 8
3E5E7E
10E13E15E20E25E30E40E50E65E80E
100E125E150E
175E200E250E300E400E
4.2
8.1
11.3
16.2
21.1
24.3
32.4
40.5
48.6
64
80
105
118130190230
235256263305400
4.2
8.5
11.9
17.0
22.0
25.5
34.0
42.5
51.0
68
85
110
133145213256
269293300346420
4.2
8.4
11.8
16.8
21.8
25.2
33.6
42.0
50.5
67
84
109
130142208250
262285292337416
4.2
8.3
11.7
16.6
21.6
24.9
33.2
41.5
50.0
66
83
108
127139203244
255277284328412
4.2
8.2
11.6
16.4
21.4
24.6
32.8
41.0
49.5
65
82
107
124136198238
248269276319408
4.2
8.1
11.5
16.2
21.2
24.3
32.4
40.5
49.0
64
81
106
121133193232
241261268310404
4.2
8.5
11.9
17.0
22.0
25.5
34.0
42.5
51.0
68
85
110
136150213255
279304312359435
4.2
8.4
11.8
16.8
21.8
25.2
33.6
42.0
50.5
67
84
109
133147210252
272296304350431
4.2
8.3
11.7
16.6
21.6
24.9
33.2
41.5
50.0
66
83
108
130144207249
265288296341427
4.2
8.2
11.6
16.4
21.4
24.6
32.8
41.0
49.5
65
82
107
127141204246
258280288332423
4.2
8.1
11.5
16.2
21.2
24.3
32.4
40.5
49.0
64
81
106
124138201243
251272280323419
SMU-20 FUSE UNITSS&C DR SPEED (TCC No. 175-2)
RatingAmperes
Peak-Load Capability, Amperes
Continuous
Daily Emergency
Time,Hours
1 2 4 8
1 2 4 8
3 DR4 DR5 DR7 DR
10 DR15 DR20 DR
3.9
5.2
6.5
9
13
20
26
3.9
5.2
6.5
9
13
20
26
3.9
5.2
6.5
9
13
20
26
3.9
5.2
6.5
9
13
20
26
3.9
5.2
6.5
9
13
20
26
3.9
5.2
6.5
9
13
20
26
3.9
5.2
6.5
9
13
20
26
3.9
5.2
6.5
9
13
20
26
3.9
5.2
6.5
9
13
20
26
3.9
5.2
6.5
9
13
20
26
3.9
5.2
6.5
9
13
20
26
