Datasheet

For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
191
British BS 88 — 690V: 6-710A
High Speed
Fuses
High Speed Fuses
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, E
g
, (rms).
Dimensions (mm)
Fig. 1: CT
7763.5
48
17.1
19.1
12.7
7.1
9.7
947046
37
19
31.8
8.7
11.9
113
A50
41
38.1
25.4
10.3
13.5
113A50
83
38
25.4
10.3
14
Fig. 2: ET, FE
74.664.354.8
6.4
8.7
8.7
4
5.5
Fig. 3: EET, FEE Fig. 4: FM, MT Fig. 5: FMM, MMT
1mm = 0.0394” / 1” = 25.4mm
Figs. 4 & 5 “A” Dimensions
Type “A”
FM 80-85mm
FMM 80-85mm
MT 85mm
MMT 85mm
Arc Voltage
This curve gives the
peak arc voltage, U
L
,
which may appear
across the fuse during its
operation as a function
of the applied working
voltage, E
g
, (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, K
p
, is given as a
function of the RMS load
current, Ib, in % of the
rated current.
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
1500
1000
500
200
400 600 660
E
g
U
L
1)
2)
1) CT
2) ET, FE, EET, FEE, FM, FMM
200 300 400 500 600
690
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1)
2)
E
g
K
1) CT, ET, EET, FE, FEE, MT, MMT
2) FM, FMM
Kp
1.0
0.8
0.4
0.5
0.6
0.3
0.2
0.1
30 40 50 60
70
80 90 100%
I
b
Data Sheet: 720024