®
Bu s s m a n n
Bo ric Ac id Fu s e s
Me d iu m Vo lt a g e
BBU
Ge ne ra l
• 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.
Ca ta log Sym bol: BBU
Medium Voltage Expulsion Fuse
Fus e Cla s s : E (Standard), SE (Slow E) & K (Fast)
Volta ge Ra ting: 17kV, 27kV & 38kV
Inte rrupting Ra tings :
17kV - 14kA
Applic a tions
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
27kV - 12.5kA
38kV - 10kA
• Feeder Circuits
• Distribution Transformers
Boric Acid, expulsion style fuses meet:
• Metal Enclosed Switchgear
• 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
• Pad Mounted Switches
Form No. BBU
Page 1 of 13
Data Sheet: 1123
5-30-02
SB02199