High Speed Fuses
British BS 88 — 690V: 6-710A
CT, ET, FE, EET, FEE, FM, FMM, MT, MMT
Specifications
Description:
BS 88 style
stud-mount fuses.
Dimensions:
See dimensions
illustrations.
Ratings:
Volts: — 690Vac/500Vdc
Amps: — 6-710A
IR: — 200kA RMS Sym.
Agency Information:
CE, Designed and tested to: BS 88
Part 4, IEC 269 Part 4, UL Recognized. MT and MMT —
350Vdc (IEC) rating. Consult Cooper Bussmann for UL
Recognition status.
Electrical Characteristics
Total Clearing I
2
t
The total clearing I
2
t at rated
voltage and at power factor
of 15% are given in the
electrical characteristics. For
other voltages, the clearing
I
2
t is found by multiplying by
correction factor, K, given as
a function of applied working
voltage, Eg, (rms).
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
200
1)
K
Arc Voltage
This curve gives the
peak arc voltage, UL,
which may appear
across the fuse during its
operation as a function
of the applied working
voltage, Eg, (rms) at a
power factor of 15%.
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.
1500
U
L
1)
1000
2)
500
E
g
200
400
600 660
1) CT
2) ET, FE, EET, FEE, FM, FMM
1.0
K
p
0.8
0.6
0.5
0.4
0.3
0.2
High Speed
Fuses
0.1
30 40 50
60
70
I
b
80 90 100%
2)
E
g
300
400
500
600 690
Features and Benefits
• Excellent cycling capability
• Excellent DC performance
• Low arc voltage and low energy let-through (I
2
t)
• Low watts loss
Typical Applications
• DC common bus
• DC drives
• Power converters/rectifiers
• Reduced voltage starters
1) CT, ET, EET, FE, FEE, MT, MMT
2) FM, FMM
Dimensions (mm)
Fig. 1: CT
4
5.5
Fig. 2: ET, FE
7.1
Fig. 3: EET, FEE
8.7
Fig. 4: FM, MT
25.4
Fig. 5: FMM, MMT
25.4
48 63.5 77
54.8 64.3 74.6
11.9
9.7
12.7
17.1
8.7
19.1
31.8
37
46 70 94
50
50
A
113
14
13.5
10.3
10.3
A
113
6.4
8.7
19
41
38.1
83
1mm = 0.0394” / 1” = 25.4mm
Data Sheet: 720024
38
Figs. 4 & 5 “A” Dimensions
Type
“A”
FM
80-85mm
FMM
80-85mm
MT
85mm
MMT
85mm
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
191
High Speed Fuses
British BS 88 — 690V: 6-710A
Catalog Numbers
Catalog
Numbers
6CT
10CT
12CT
16CT
20CT
25ET
32ET
35ET
40ET
45ET
56ET
63ET
80ET
35FE
40FE
45FE
50FE
63FE
71FE
80FE
90FE
100FE
90EET
110EET
140EET
160EET
100FEE
120FEE
140FEE
160FEE
180FEE
200FEE
180FM
200FM
225FM
250FM
280FM
315FM
350FM
400FMM
450FMM
500FMM
550FMM
630FMM
700FMM
160MT
180MT
200MT
250MT
280MT
315MT
355MT
180MMT
200MMT
225MMT
280MMT
315MMT
355MMT
400MMT
450MMT
500MMT
560MMT
630MMT
710MMT
Rated
Current
RMS-Amps
6
10
12
16
20
25
32
35
40
45
56
63
80
35
40
45
50
63
71
80
90
100
90
110
140
160
100
120
140
160
180
200
180
200
225
250
280
315
350
400
450
500
550
630
700
160
180
200
250
280
315
355
180
200
225
280
315
355
400
450
500
560
630
710
Electrical Characteristics
I
2
t (A
2
Sec)
Clearing Clearing
Pre-arc
at 415V
at 660V
1.8
8.5
12
7
30
48
10
40
65
16
66
110
32
150
220
25
150
250
32
190
350
52
310
500
103
600
900
103
680
1100
135
950
1500
171
1200
2000
360
2500
4000
33
130
200
52
180
300
76
270
450
103
380
600
135
480
750
210
600
950
250
900
1500
360
1300
2100
470
1800
2800
490
3000
4500
600
4000
6500
1050
7000
12000
1500
10000
17000
400
1600
2400
540
1900
3100
850
2500
3800
1000
3700
5700
1400
5300
8400
1900
7100
11400
1400
7500
13500
2600
10500
18500
3700
14500
26500
5200
20500
37500
7000
30500
55000
10000
40000
77000
15000
60000
105000
10000
40000
72500
15000
60000
105000
20000
82000
150000
30000
120000
215000
45000
180000
310000
60000
245000
420000
2400
15000
25000
3800
25000
38000
6000
40000
58000
11500
80000
110000
16500
100000
150000
19000
125000
180000
22000
160000
200000
1650
12000
18000
2200
16000
23000
3700
26000
40000
6600
47000
70000
8600
62000
91000
13500
97000
140000
21000
150000
220000
30000
220000
320000
42000
300000
450000
60000
430000
640000
68500
500000
720000
78000
600000
850000
Watts
Loss
2
3
3
7
7
7
11
11
9
11
14
16
18
9
9
11
11
12
17
20
20
23
19
27
35
39
24
32
36
46
46
52
40
40
44
48
48
55
55
85
90
100
100
100
120
26
26
27
32
35
42
51
42
42
42
47
51
54
60
57
64
64
86
105
CT 6-20, ET 25-80A: 690V
Time-Current Curve
10
4
6
4
2
10
3
6
4
2
10
2
6
4
Virtual Pre-Arcing Time In Seconds
2
10
1
6
4
2
10
0
6
4
2
10
–1
6
4
2
10
–2
Type
CT
ET
25ET
32ET
35ET
40ET
45ET
56ET
63ET
80ET
6CT
10CT
12CT
16CT
20CT
FE
EET
6
4
2
10
–3
FEE
6
4
2
10
–4
2
4
6
8 10
1
2
4
6
8 10
2
2
4
6
8 10
3
Prospective Current In Amps RMS
FM
Peak Let-Through Curve
6
4
2
10
5
FMM
315MT 355MT
280MT
250MT
180MT
160MT
6
4
2
Peak Let-Through Current
10
4
710MMT
630MMT
560MMT
500MMT
450MMT
400MMT
355MMT
315MMT
280MMT
200MT
225MMT
200MMT
180MMT
MT
6
4
2
10
3
6
4
2
10
2
6
4
2
10
1
10
1
20CT
16CT
12CT
10CT
6CT
80ET
63ET
56ET
45ET
40ET
35ET
32ET
25ET
160EET
140EET
110EET
90EET
MMT
• Watts loss provided at rated current.
• Note: FC, 8ET, 12ET, 15ET, 20ET, 65EET and 75EET are available for replacement
purposes on existing equipment.
• See accessories on page 195.
2
4
6
10
2
2
4
6
10
3
2
4
6
10
4
2
4
6
10
5
2
Prospective Short-Circuit Current Symmetrical RMS
Data Sheet: 35785312
192
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
High Speed Fuses
British BS 88 — 690V: 6-710A
EET 90-160A, MT 160-355A: 690V
Time-Current Curve
10
4
6
4
2
10
3
6
4
2
10
2
6
4
Virtual Pre-Arcing Time In Seconds
2
160MT
180MT
200MT
250MT
280MT
315MT
355MT
MMT 180-710A: 690V
Time-Current Curve
10
4
6
4
2
10
3
6
4
2
10
2
6
4
Virtual Pre-Arcing Time In Seconds
2
10
1
6
4
2
10
0
6
4
2
10
–1
400MMT
450MMT
500MMT
560MMT
630MMT
710MMT
10
1
6
4
2
10
0
6
4
2
10
–1
6
4
2
10
–2
90EET
110EET
140EET
160EET
180MMT
200MMT
225MMT
280MMT
315MMT
355MMT
High Speed
Fuses
6
4
2
10
–2
6
4
2
10
–3
6
4
2
10
–4
2
4
6
8 10
2
2
4
6
8 10
3
2
4
6
8 10
4
6
4
2
10
–3
6
4
2
10
–4
Prospective Current In Amps RMS
10
2
2
Data Sheet: 35785313
2
4
10
3
Prospective Current In Amps RMS
4
6
8
6
8
10
4
Data Sheet: 35785311
Peak Let-Through Curve
6
4
2
10
5
315MT 355MT
280MT
250MT
180MT
160MT
6
4
2
Peak Let-Through Current
10
4
710MMT
630MMT
560MMT
500MMT
450MMT
400MMT
355MMT
315MMT
280MMT
200MT
225MMT
200MMT
180MMT
6
4
2
10
3
6
4
2
10
2
6
4
2
10
1
10
1
20CT
16CT
12CT
10CT
6CT
80ET
63ET
56ET
45ET
40ET
35ET
32ET
25ET
160EET
140EET
110EET
90EET
2
4
6
10
2
2
4
6
10
3
2
4
6
10
4
2
4
6
10
5
2
Prospective Short-Circuit Current Symmetrical RMS
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
193
High Speed Fuses
British BS 88 — 690V: 6-710A
FE 35-100A & FM 180-350A: 690V
Time-Current Curve
10
4
6
4
2
10
3
6
4
2
10
2
6
4
Virtual Pre-Arcing Time In Seconds
2
10
1
6
4
2
10
0
6
4
2
10
–1
FEE 100-200A & FMM 400-700A: 690V
Time-Current Curve
10
4
6
4
2
10
3
6
4
180FM
200FM
220FM
250FM
280FM
315FM
350FM
2
10
2
6
4
Virtual Pre-Arcing Time In Seconds
2
10
1
6 100FEE
4 120FEE
140FEE
2 160FEE
180FEE
10
0
200FEE
6
4
2
10
–1
400FMM
450FMM
500FMM
550FMM
630FMM
700FMM
6
4
2
10
–2
6
4
2
10
–3
35FE
40FE
45FE
50FE
63FE
71FE
80FE
90FE
100FE
6
4
2
10
–2
6
4
2
10
–4
2
4
6
8 10
2
2
4
6
8 10
3
2
4
6
8 10
4
6
4
2
10
–3
6
4
2
10
–4
Prospective Current In Amps RMS
10
2
2
4
6 8
2
4
10
3
Prospective Current In Amps RMS
6
8
10
4
Peak Let-Through Curve
10
5
6
4
Peak Let-Through Curve
8
6
700FMM
630FMM
550FMM
500FMM
4
450FMM
400FMM
2
10
4
6
4
Peak Let-Through Current
2
10
3
6
4
2
10
2
6
4
2
350FM
315FM
280FM
250FM
225FM
200FM
180FM
2
Peak Let-Through Current
100FE
90FE
80FE
71FE
63FE
50FE
45FE
40FE
35FE
10
4
8
6
4
2
10
3
8
6
200FEE
180FEE
160FEE
140FEE
4
120FEE
100FEE
10
1
10
1
2
4
6
10
2
2
4
6
10
3
2
4
6
10
4
2
4
6
10
5
2
Prospective Short-Circuit Current Symmetrical RMS
2
10
2
2
4
6
10
3
2
4
6
10
4
2
4
6
10
5
2
Prospective Short-Circuit Current Symmetrical RMS
Data Sheet: 35785314
Data Sheet: 35785292
194
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
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