In our continuing strategy to deliver unparalleled circuit protection solutions,
technical expertise and application leadership, we proudly introduce the
WICKMANN Group and its products to the Littelfuse portfolio.
040706 www.littelfuse.com
POLYFUSE® RESETTABLE FUSES
Strap Type, 15 V / 24 V
Standard
UL 1434 1st Edition
CSA C22.2 No. 0 CSA TIL No. CA-3A
Approvals
cULus Recognition
TÜV
Features
This product line similar to the STD family is
designed to provide overcurrent protection for
rechargable batteries at elevated temperatures.
These devices offer hold currents from 0.7 A to
4.3 A and voltages from 15 V to 24 V.
LTD Specifi cations
Packaging
A small pack
D standard
Materials
Insulating material: Polyester Tape
Terminals: Nickel
Max. Device Surface Temperature in Tripped State
120 °C
Operating / Storage Temperature
-40 ºC to +85 ºC (consider derating)
Humidity Ageing
+85 °C, 85 % R.H., 7 days, ± 5 % typical resistance change
Vibration
MIL-LTD-883C, Condition A, no change
Marking
“P”, Part Code, identifi cation, lot number
cURus
TÜV
LTD070 700 1.50 15 100 5.0 @ 3.5 1.00 0.100 0.200 0.340 • •
LTD070S 700 1.50 15 100 5.0 @ 3.5 1.00 0.100 0.200 0.340 • •
LTD100 1.00 2.50 24 100 7.0 @ 5.0 1.50 0.070 0.130 0.260 • •
LTD100S 1.00 2.50 24 100 7.0 @ 5.0 1.50 0.070 0.130 0.260 • •
LTD100SS 1.00 2.50 24 100 7.0 @ 5.0 1.50 0.070 0.130 0.260 • •
LTD180 1.80 3.80 24 100 2.9 @ 9.0 2.00 0.040 0.068 0.120 • •
LTD180S 1.80 3.80 24 100 2.9 @ 9.0 2.00 0.040 0.068 0.120 • •
LTD180SS 1.80 3.80 24 100 2.9 @ 9.0 2.00 0.040 0.068 0.120 • •
LTD190 1.90 4.20 24 100 3.0 @ 10.0 1.90 0.030 0.057 0.100 • •
LTD260 2.60 5.20 24 100 5.0 @ 13.0 2.30 0.025 0.042 0.076 • •
LTD300 3.00 6.30 24 100 4.0 @ 15.0 2.00 0.015 0.031 0.055 • •
LTD310 3.10 6.00 24 100 5.0 @ 16.0 2.50 0.018 0.030 0.055 • •
LTD340 3.40 6.80 24 100 5.0 @ 17.0 2.70 0.016 0.027 0.050 • •
Permissible continuous operating current is ≤ 100 % at ambient temperature of 20 ºC (68 ºF).
NOTE:
I hold = Hold current: maximum current device will pass without tripping in 20 °C still air.
I trip = Trip current: minimum current at which the device will trip in 20 °C still air.
Vmax = Maximum voltage device can withstand without damage at rated current (I max)
I max = Maximum fault current device can withstand without damage at rated voltage (Vmax)
Pd = Power dissipated from device when in the tripped state at 20 °C still air.
R min= Minimum resistance of device in initial (un-soldered) state.
R 1max= Maximum resistance of device at 20 °C measured one hour after tripping for 20 s.
Caution: Operation beyond the specifi ed rating may result in damage and possible arcing and fl ame.
Specifi cations are subject to change without notice
LTD070 1 19.9 22.1 4.9 5.2 0.7 1.2 5.5 3.9 4.1 500 10,000
LTD070S 2 19.9 22.1 4.9 5.2 0.7 1.2 5.5 3.9 4.1 500 10,000
LTD100 1 20.9 23.1 4.9 5.2 0.6 1.0 4.1 3.9 4.1 500 10,000
LTD100S 2 20.9 23.1 4.9 5.2 0.6 1.0 4.1 3.9 4.1 500 10,000
LTD100SS 3 20.9 23.1 4.9 5.2 0.6 1.0 4.1 3.9 4.1 500 10,000
LTD180 1 24.0 26.0 4.9 5.2 0.6 1.0 4.1 3.9 4.1 500 10,000
LTD180S 2 24.0 26.0 4.9 5.2 0.6 1.0 4.1 3.9 4.1 500 10,000
LTD180SS 3 24.0 26.0 4.9 5.2 0.6 1.0 4.1 3.9 4.1 500 10,000
LTD190 1 21.3 23.4 10.2 11.0 0.5 1.0 5.0 4.8 5.4 500 10,000
LTD260 1 24.0 26.0 10.8 11.9 0.6 1.0 5.0 5.9 6.1 500 10,000
LTD300 1 28.4 31.8 13.0 13.5 0.5 1.1 6.3 6.0 6.6 500 10,000
LTD310 1 24.0 26.0 14.8 15.9 0.6 1.0 5.0 5.9 6.1 500 10,000
LTD340 1 24.0 26.0 14.8 15.9 0.6 1.0 5.0 5.9 6.1 500 10,000
Dimensions (mm)
Model Ihold I
Trip V
max. dc I
max. max. time to trip Pd max. Resistance Approvals
(mA/A) (A) (V) (A) (s @ A) (W) R min.()
R max.()
RI max.()
Order Qty. Order- Model Packaging
Information Number
Model A B C D E packaging quantity
Fig Min Max Min Max Min Max Min Min Max small pack standard
Dimensions (mm)
S: one slot
SS: two slots
In our continuing strategy to deliver unparalleled circuit protection solutions,
technical expertise and application leadership, we proudly introduce the
WICKMANN Group and its products to the Littelfuse portfolio.
040706 www.littelfuse.com
POLYFUSE® RESETTABLE FUSES
LTD
Thermal Derating Chart
Model Ambient Operation Temperature - Ihold (A)
-40 °C -20 °C 0 °C 23 °C 40 °C 50 °C 60 °C 70 °C 85 °C
LTD070 1.20 1.09 0.85 0.70 0.50 0.45 0.35 0.28 0.16
LTD070S 1.20 1.09 0.85 0.70 0.50 0.45 0.35 0.28 0.16
LTD100 1.86 1.60 1.40 1.00 0.83 0.70 0.60 0.44 0.23
LTD100S 1.86 1.60 1.40 1.00 0.83 0.70 0.60 0.44 0.23
LTD100SS 1.86 1.60 1.40 1.00 0.83 0.70 0.60 0.44 0.23
LTD180 3.13 2.68 2.20 1.80 1.33 1.10 0.90 0.65 0.36
LTD180S 3.13 2.68 2.20 1.80 1.33 1.10 0.90 0.65 0.36
LTD180SS 3.13 2.68 2.20 1.80 1.33 1.10 0.90 0.65 0.36
LTD190 3.32 2.86 2.40 1.90 1.48 1.25 1.10 0.79 0.43
LTD260 4.30 3.72 3.10 2.60 1.98 1.69 1.40 1.11 0.60
LTD300 5.10 4.40 3.70 3.00 2.30 1.95 1.60 1.25 0.69
LTD310 5.36 4.58 3.70 3.10 2.36 2.01 1.70 1.30 0.71
LTD340 5.52 4.79 4.00 3.40 2.60 2.24 1.90 1.51 0.78
A: LTD190
B: LTD180
C: LTD100S
1.
00
1
0
.
00
1
00
.
00
0.01
0.10
1.00
10.00
100.00
ABC
Fault Current (A)
Time to Trip (s)
