High Speed Fuses
Square Body US Style — 1250V/1300V (IEC/UL): 50-1400A
1250V/1300V (IEC/UL) 50-1400A
Specifications
Description:
Square body US
style high speed fuses.
Dimensions:
See dimensions
illustration.
Ratings:
Volts: — 1250Vac (IEC)
— 1300Vac (UL)
Amps: — 50-1400A
IR: — 100kA RMS Sym.
Ag ency Information:
CE,
Designed and tested to IEC
60269: Part 4, UL Recognized.
Consult Cooper Bussmann for UL
Recognition/CSA Component
Acceptance status.
Electrical
Characteristics
Total Clearing I
2
t
0.5
The total clearing I
2
t at
0.4
rated voltage and at power
factor of 15% are given in
0.3
the electrical
0.2
E
g
characteristics. For other
2
voltages, the clearing I t is
400 600 800 1000 1200 1400
Dashed lines (- - - - - -) apply to the
found by multiplying by
correction factor, K, given as
following amperages:.
Siz e
Amps.
a function of applied working
1*
400A
1
500-630A
voltage, Eg, (rms).
2
3
630-1000A
800-1400A
1.5
K
1.25
1.0
Arc Voltage
This curve gives the peak
1.8
arc voltage, UL, which
1.4
may appear across the
fuse during its operation
10
3
8
as a function of the
applied working voltage,
6
Eg, (rms) at a power factor
5
4
of 15%.
3
3
2.5
UL
E
g
600
800
1000 1200 1400
Power Losses
Watts loss at rated current
is given in the electrical
characteristics. The curve
allows the calculation of
the power losses at load
currents lower than the
rated current. The
correction factor, Kp, is
given as a function of the
RMS load current, Ib, in %
of the rated current.
•
•
•
•
400
1.0
K
p
0.8
0.6
0.5
0.4
0.3
0.2
0.1
30 40 50
60
70
I
b
80 90 100%
Features and Benefits
Excellent DC performance
Low arc voltage and low energy let-through (I
2
t)
Low watts loss
Superior cycling capability
Typical Applications
• DC common bus
• DC drives
• Power converters/rectifiers
• Reduced voltage starters
For Other Voltage Ratings in This Body Style
Dimensions (mm)
Type -FU/115, -FKE/115
Siz e
1*
1
2
3
B
156
160
160
159
C1
130
127
127
128
C2
101
102
102
101
D
59
69
77
92
B
• See pages 126 (690V/700V) and 150 (1000V)
E
45
53
61
76
H
20
25
25
36
I
10
14
14
16
1mm = 0.0394” / 1” = 25.4mm
6
A
D
E
C1
C2
E
I
H
164
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
High Speed Fuses
Square Body US Style — 1250V/1300V (IEC/UL): 50-1400A
Catalog Numbers
Catalog Numbers
-FKE/115
-FU/115
Type K
Without
Indicator
Indicator
for Micro
170M3688
170M3738
170M3689
170M3739
170M3690
170M3740
170M3691
170M3741
170M3692
170M3742
170M3693
170M3743
170M3694
170M3744
170M3695
170M3745
170M3696
170M3746
170M3697
170M3747
170M4688
170M4738
170M4689
170M4739
170M4690
170M4740
170M4691
170M4741
170M4692
170M4742
170M4693
170M4743
170M4694
170M4744
170M4695
170M4745
170M4696
170M4746
170M4697
170M4747
170M5688
170M5738
170M5689
170M5739
170M5690
170M5740
170M5691
170M5741
170M5692
170M5742
170M5693
170M5743
170M5694
170M5744
170M5695
170M5745
170M5696
170M5746
170M5697
170M5747
170M5698
170M5748
170M5699
170M5749
170M5700
170M5750
170M6688
170M6738
170M6689
170M6739
170M6690
170M6740
170M6691
170M6741
170M6692
170M6742
170M6693
170M6743
170M6694
170M6744
170M6695
170M6745
170M6696
170M6746
170M6697
170M6747
170M6698† 170M6748†
170M6699† 170M6749†
170M6700‡ 170M6750‡
170M6701‡ 170M6751‡
Electrical Characteristics
Rated
Current
RMS-Amps Pre-arc
50
135
63
215
80
420
100
750
125
1450
160
2600
200
5150
250
9200
315
18500
350
27000
160
1900
200
3800
250
7750
315
15000
350
20000
400
29500
450
42000
500†
69500
550†
95000
630‡
130000
250
6500
280
9350
315
13000
350
16500
400
23000
450
34000
500
48000
550
62000
630
115000
700†
160000
800†
245000
900‡
360000
1000‡
480000
315
9500
350
13500
400
19500
450
31000
500
39000
550
55000
630
83500
700
115000
800
205000
900
305000
1000¥
450000
1100¥
575000
1250¥
810000
1400¥
1250000
I
2
t (A
2
Sec)
Clearing Clearing
at 1000V at 1250V
815
1100
1300
1750
2500
3350
4450
5950
9000
11500
16000
21000
31000
41000
54500
73000
115000
150000
165000
220000
11500
15500
22500
30000
46000
61500
90000
120000
125000
165000
175000
235000
250000
335000
340000
465000
660000
38500
51500
55500
74500
77500
105000
97500
135000
140000
180000
205000
270000
285000
380000
370000
495000
575000
730000
795000
1200000
1750000
2350000
58000
77500
81500
110000
120000
160000
185000
245000
235000
310000
325000
435000
495000
665000
705000
940000
995000 1300000
1500000 1900000
2150000
2800000
3950000
6000000
Watts
Loss
15
20
25
30
35
40
45
55
60
65
45
50
60
65
70
75
80
85
95
100
65
70
75
80
85
90
95
100
110
115
120
125
135
185
90
95
100
105
110
115
120
125
130
135
140
145
150
Siz e
1*
High Speed
Fuses
1
2
3
†Rated voltage (IEC) 1100.
‡Rated voltage (IEC) 1000V.
¥ UL Recognition at 1000V.
• Watts loss provided at rated current.
• Microswitch indicator ordered separately. See accessories on pages 185-186.
• For fuse curves see pages 166 and 167.
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
165
High Speed Fuses
Square Body Size 1*, 1 — 1250V/1300V (IEC/UL):
50-1400A
Size 1* — 50-400A:1250V
Time-Current Curve
Size 1 — 160-630A: 1250V
Time-Current Curve
160A
200A
250A
315A
350A
400A
450A
500A 550A
630A
A
Virtual Pre-Arcing Time In Seconds
10
1
A
1x10
2
10
3
10
4
Prospective Current In Amp RMS
10
4
10
3
10
2
10
0
10
–1
10
–2
10
–3
1x10
–4
10
5
Peak Let-Through Curve
10
5
B
Peak Let-Through Curve
10
5
B
400A
350A
315A
250A
200A
160A
125A
100A
80A
63A
50A
630A
550A
500A
450A
400A
350A
315A
250A
200A
160A
10
4
Peak Let-Through Current
10
4
10
3
Peak Let-Through In Amperes
10
3
A
2x10
2
1x10
2
10
3
10
4
10
5
Prospective Short-Circuit Current Symmetrical RMS
10
6
A
2x10
2
1x10
2
10
3
10
4
10
5
Prospective Short-Circuit Current Symmetrical RMS
10
6
630A fuse is derated to 1100V (IEC).
Data Sheet: 17056630
Data Sheet: 17056632
166
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
High Speed Fuses
Square Body Size 2, 3 — 1250V/1300V (IEC/UL):
50-1400A
Size 2 — 250-1000A: 1250V
Time-Current Curve
250A
280A
315A 350A
400A
450A
500A 550A
630A
700A
800A
900A
1000A
Size 3 — 315-1400A: 1250V
Time-Current Curve
10
4
10
3
10
2
A
High Speed
Fuses
Virtual Pre-Arcing Time In Seconds
10
1
A
10
0
10
–1
10
–2
10
–3
1x10
–4
1x10
2
10
3
10
4
Prospective Current In Amp RMS
10
5
Peak Let-Through Curve
10
5
Peak Let-Through Curve
10
5
1400A
1250A
1100A
1000A
900A
800A
700A
630A
550A
500A 450A
400A
350A
315A
B
1000A
900A
800A
700A
630A
550A
500A
450A
400A
315A 350A
280A
250A
Peak Let-Through Current
B
Peak Let-Through Current
10
4
10
4
10
3
10
3
A
2x10
2
1x10
2
10
3
10
4
10
5
Prospective Short-Circuit Current Symmetrical RMS
10
6
2x10
2
A
1x10
2
10
3
10
4
10
5
Prospective Short-Circuit Current Symmetrical RMS
10
6
900-1000A fuses are derated to 1100V (IEC).
1250-1400A fuses are derated to 1100V (IEC).
Data Sheet: 17056634
Data Sheet: 17056636
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
167
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