Bussmann
®
Low-Peak
®
Yellow Time Lag Fuses
Class T – 600 Volts, 35-60 Amps
Dimensional Data
1.56"
(0.06mm)
LPT
0.81"
(0.03mm)
35–60A
1.00"
(0.04mm)
CATALOG SYMBOL: LPT
35 TO 60 AMPERES
600 VOLTS AC (OR LESS)*
CURRENT LIMITING
INTERRUPTING RATING - 200,000A RMS SYM.
U.L. LISTED CLASS T
(GUIDE # JDDZ, FILE # E4273)
CSA HRCI-T
(CLASS 1422-02, FILE # 53787)
* Self certified for 300V DC, 10kA interrupting rating.
LPT Low-Peak
®
Yellow Time Lag Fuse
• A superior all-purpose space saving branch circuit fuse that
meets most protection requirements up to 60 amps.
• Very compact, physical size is only .81” x 1.56” (20.6mm x
39.7mm) with 1.0” Class T rejection feature.
• Time lag to avoid unwanted fuse openings from surge cur-
rents when sized appropriately per NEC
®
.
• For protection of motor circuits up to 15 horsepower at 460V,
or 20 horsepower at 575V.
• Fast response under short-circuit conditions for a high
degree of current limitation.
• Maximum interrupting rating of 200,000 amperes for use in
today’s large capacity systems.
Catalog Symbols and Ampere Ratings
LPT-35
LPT-40
LPT-45
LPT-50
LPT-60
Standard T Fuseblocks (600V)
Catalog Data (reference BIF Document: 1116)
Carton Quantity and Weight-LPT Time Lag (600V AC)
Ampere
Ratings
35-60
Carton
Qty
10
Weight**
Lbs.
0.82
Kg.
0.371
Amps
35
to
60
Poles
1
2
3
Screw No.
T60060-1SR
T60060-2SR
T60060-3SR
Box Lug
T60060-1CR
T60060-2CR
T60060-3CR
**Weight per carton.
12-21-98
SB98107
Rev. A
Form No. LPT
Page 1 of 2
BIF Document:1031
Bussmann
®
Low-Peak
®
Yellow Time Lag Fuses
Class T – 600 Volts, 35-60 Amps
Current Limitation Curves
B
35
1,000
60
LPT
Time-Current Characteristic Curves–Average Melt
AMPERE
RATING
INSTANTANEOUS PEAK LET-THRU CURRENT IN AMPS
400,000
100,000
AMPERE
RATING
100
10,000
60
35
10
TIME IN SECONDS
1,000
A
100
1
100,000
200,000
10,000
1,000
100
.1
RMS SYMMETRICAL CURRENTS IN AMPERES
A–B=ASYMMETRICAL AVAILABLE PEAK (2.3 X SYMM RMS AMPS)
Motor Application
Per NEC 430-52: LPT fuses may be sized at a maximum of
300% of motor F.L.A. (or next standard fuse size, if 300%
does not correspond to a standard fuse size). For longer
acceleration times, fuse sizing can be increased but shall not
exceed 400%.
10,000
CURRENT IN AMPERES
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 BIF 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 select-
ed, it should be tested by the user in all possible applications.
12-21-98
SB98107
Rev. A
Form No. LPT
Page 2 of 2
BIF Document: 1031
60,000
1000
100
10
.01
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