1250V (Consult Bussmann for U.L. Recognition/ CSA Component Acceptance status.)
Individual Fuse Weight: Size 1* = 0.380 kg
Size 1 = 0.580 kg
Size 2 = 0.900 kg
Size 3 = 1.250 kg
Microswitch indicator ordered separately.
1 lb = 0.45 kg
7-11-01
SB01191
Form No.
Page 1 of 2
BIF Doc #720031
Bussmann
Square Body – Flush End Contact
®
¥
1250V/1300V (IEC/U.L.)
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 volt-
ages, the clearing I
2
t is found by multi-
plying by correction factor, K, given as
a function of applied working voltage,
E
g
, (RMS).
1.5
K
1.25
1.0
50-1400A
R
®
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, I
b
, in % of the rated current .
1.0
K
p
0.8
0.6
0.5
0.4
3
2.5
1.8
1.4
UL
0.5
0.4
0.3
0.2
E
g
400
600
800
1000 1200 1400
10
3
8
6
5
4
3
400
600
800
E
g
1000 1200 1400
0.3
0.2
0.1
30 40 50
60
70
I
b
80 90 100%
------
Dashed lines apply to the following amperages:
Size
Amp
1*
400
1
500-630
2
630-1000
3
800-1400
Dimensions
Flush End Contact: Type -BKN/-, -GKN/-
B
D
E
A
F
E
H
G
Size
1*
1*
1
1
2
2
2
3
3
3
§
Type
BKN + GKN/75
BKN/80
BKN + GKN/75
BKN/80
BKN + GKN/75
BKN/80
BKN + GKN/90
BKN + GKN/75
BKN/80
BKN + GKN/90
A
74
80
74
80
74
80
80
74
81
81
B
75
81
75
81
75
81
91
76
83
91
D
59
59
69
69
77
77
77
92
92
92
E
45
45
53
53
61
61
61
76
76
76
F
M8
M8
M8
M8
M10
M10
M10
M12
M12
M12
F
§
fiΩ¡§∑ - 18 UNC-2B
fiΩ¡§∑ - 18 UNC-2B
‹Ω•∑ - 16 UNC-2B
‹Ω•∑ - 16 UNC-2B
⁄Ω™∑ - 13 UNC-2B
⁄Ω™∑ - 13 UNC-2B
G
5
5
8
8
10
10
10
10
10
10
H
Ø17
Ø17
Ø20
Ø20
Ø24
Ø24
Ø24
Ø30
Ø30
Ø30
Valid for fuses type -GKN/-
Dimension in mm.
1mm = 0.0394∑
1∑ = 25.4mm
The only controlled copy of this BIF document is the electronic read-only version located on the Bussmann Network Drive. All other copies of this document are by definition uncontrolled.
This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Bussmann reserves the right,
without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Bussmann also reserves the right to change or update, without
notice, any technical information contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications.
