Bussmann
®
Boric Acid Fuses
Medium Voltage
BBU
General
• The BBU power fuse is a Boric Acid, expulsion style
fuse unit.
• Provides a low initial cost alternative to refillable fuses
in indoor applications.
• Utilizes calibrated silver elements, boric acid for its inter-
rupting media, and a spring & rod mechanism.
• The housing is a fiberglass reinforced resin tube with plated
copper contacts.
• Available in 3 maximum voltage classes:
17kV, 27kV & 38kV
• Available in 3 speed variations:
E (Standard) SE (Slow E) & K (Fast)
• Visual Indicating with use of end fittings.
• End Fittings:
• End fittings are required to complete the electrical
connection between the fuse unit and the live parts
and mounting.
• The indoor fittings accept a Muffler attachment to
limit noise and contamination to indoor equipment.
The open fuse indicator located on the top end fit-
ting provides visual indication on a faulted fuse unit.
Catalog Symbol:
BBU
Medium Voltage Expulsion Fuse
Fuse Class:
E (Standard), SE (Slow E) & K (Fast)
Voltage Rating:
17kV, 27kV & 38kV
Interrupting Ratings:
17kV - 14kA
27kV - 12.5kA
38kV - 10kA
Boric Acid, expulsion style fuses meet:
• ANSI C37.40 – Service Conditions and Definitions
• ANSI C37.41 – Power Fuse Design and Testing
• ANSI C37.42 – Distribution Fuse Ratings and Specifications
• ANSI C37.46 – Power Fuse Ratings and Specifications
• ANSI C37.48 – Power Fuse Application, Operations and
Maintenance
Applications
The BBU Boric Acid fuse provides effective protection for cir-
cuits and equipment which operate on voltage systems up to
34,500V. Typical usage is on industrial distribution systems for:
• Power Transformers
• Feeder Circuits
• Distribution Transformers
• Metal Enclosed Switchgear
• Pad Mounted Switches
5-30-02
SB02199
Form No. BBU
Page 1 of 13
Data Sheet: 1123
Bussmann
®
Boric Acid Fuses
Medium Voltage
Illustration & Diimensional Data
BBU
1.244
DIA.
kV
Max.
17
27
38
Fuse Unit Fittings
A
19.08
22.58
28.76
B
27.19
30.69
36.87
C
28.82
32.32
38.50
5-30-02
SB02199
Form No. BBU
Page 2 of 13
Data Sheet: 1123
Bussmann
®
Boric Acid Fuses
Medium Voltage
BBU Boric Acid Fuses for Use Indoors
Indoor
Max. Int. kA Sym
Max. Int. kA Sym
Catalog Number
Ampere Rating
Indoor
Catalog Number
BBU-EFID
BBU-EFID
BBU-EFID
BBU-EFID
BBU-EFID
BBU
Voltage (kV)
Voltage (kV)
Fuse Type
Fuse Type
Amps
3
6
8
10
12
15
20
25
30
40
50
65
80
100
140
200
5
7
10
13
15
20
25
30
40
50
65
80
100
125
150
175
200
15
20
25
30
40
50
65
80
100
125
150
175
200
3
6
8
10
12
15
20
25
30
40
50
65
80
100
140
200
5
7
10
13
15
20
25
30
40
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
E
E
E
E
E
E
E
E
E
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
BBU17-3K
BBU17-6K
BBU17-8K
BBU17-10K
BBU17-12K
BBU17-15K
BBU17-20K
14
BBU17-25K
BBU17-30K
BBU17-40K
BBU17-50K
BBU17-65K
BBU17-80K
BBU17-100K
BBU17-140K
BBU17-200K
BBU17-5E
BBU17-7E
BBU17-10E
BBU17-13E
BBU17-15E
BBU17-20E
BBU17-25E
BBU17-30E
14
BBU17-40E
BBU17-50E
BBU17-65E
BBU17-80E
BBU17-100E
BBU17-125E
BBU17-150E
BBU17-175E
BBU17-200E
BBU17-15SE
BBU17-20SE
BBU17-25SE
BBU17-30SE
BBU17-40SE
BBU17-50SE
BBU17-65SE
14
BBU17-80SE
BBU17-100SE
BBU17-125SE
BBU17-150SE
BBU17-175SE
BBU17-200SE
BBU27-3K
BBU27-6K
BBU27-8K
BBU27-10K
BBU27-12K
BBU27-15K
BBU27-20K
BBU27-25K
BBU27-30K 12.5
BBU27-40K
BBU27-50K
BBU27-65K
BBU27-80K
BBU27-100K
BBU27-140K
BBU27-200K
BBU27-5E
BBU27-7E
BBU27-10E
BBU27-13E
BBU27-15E
BBU27-20E
BBU27-25E
BBU27-30E
BBU27-40E
3K to 200K
BBU-EFID
50
65
80
100
125
150
175
200
15
20
25
30
40
50
65
80
100
125
150
175
200
3
6
8
10
12
15
20
30
40
50
65
80
100
140
200
5
7
10
13
15
20
25
30
40
50
65
80
100
125
150
175
200
15
20
25
30
40
50
65
80
100
125
150
175
200
Amps
E
E
E
E
E
E
E
E
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
27
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
BBU27-50E 12.5
BBU27-65E
BBU27-80E
BBU27-100E
BBU27-125E
BBU27-150E
BBU27-175E
BBU27-200E
BBU27-15SE
BBU27-20SE
BBU27-25SE
BBU27-30SE
BBU27-40SE
BBU27-50SE
BBU27-65SE
BBU27-80SE 12.5
BBU27-100SE
BBU27-125SE
BBU27-150SE
BBU27-175SE
BBU27-200SE
BBU38-3K
BBU38-6K
BBU38-8K
BBU38-10K
BBU38-12K
BBU38-15K
BBU38-20K
BBU38-30K
BBU38-40K
BBU38-50K
BBU38-65K
BBU38-80K
BBU38-100K
BBU38-140K
BBU38-200K
BBU38-5E
BBU38-7E
BBU38-10E
BBU38-13E
BBU38-15E
BBU38-20E
BBU38-25E
BBU38-30E
BBU38-40E
BBU38-50E
BBU38-65E
BBU38-80E
BBU38-100E
BBU38-125E
BBU38-150E
BBU38-175E
BBU38-200E
BBU38-15SE
BBU38-20SE
BBU38-25SE
BBU38-30SE
BBU38-40SE
BBU38-50SE
BBU38-65SE
BBU38-80SE
BBU38-100SE
BBU38-125SE
BBU38-150SE
BBU38-175SE
BBU38-200SE
5E to 200E
BBU-EFID
10
15SE to 200SE
BBU-EFID
10
3K to 200K
BBU-EFID
10
5E to 200E
BBU-EFID
*Note: Muffler can be ordered separately. Order Catalog number
BBU-MFLR.
5-30-02
SB02199
Form No. BBU
ˆPage 3 of 13
Data Sheet: 1123
15SE to 200SE
5E to 200E
3K to 200K
15SE to 200SE
5E to 200E
Ampere Rating
End Fittings
Catalog
Number
End Fittings
Catalog
Number
Bussmann
®
Boric Acid Fuses
Medium Voltage
Time Current Characteristics
BBU
5-30-02
SB02199
Form No. BBU
Page 4 of 13
Data Sheet: 1123
Bussmann
®
Boric Acid Fuses
Medium Voltage
Time Current Characteristics
BBU
5-30-02
SB02199
Form No. BBU
Page 5 of 13
Data Sheet: 1123
