Littelfuse 72R Series User Manual
Polyfuse, Resettable ptcs, 72r series
91
Revised: July 12, 2010
POLYFUSE
®
Resettable PTCs
© 2010 Littelfuse, Inc
72R Series
Radial Leaded > 72R Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/72R.html for current information.
72R S
eries
72R Series
The 72R Series is designed to provide overcurrent
protection to 72Vdc maximum voltage with a maximum
40A short circuit rating.
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E183209
R50119318
Electrical Characteristics
Part Number
I
hold
(A)
I
trip
(A)
V
max
(Vdc)
I
max
(A)
P
d
typ.
(W)
Maximum Time
To Trip
Resistance
Agency
Approvals
Current
(A)
Time
(Sec.)
R
min
(Ω)
R
1max
(Ω)
72R020X
0.20
0.40
72
40
0.41
1.00
2.20
1.830
4.400
X
X
72R025X
0.25
0.50
72
40
0.45
1.25
2.50
1.250
3.000
X
X
72R030X
0.30
0.60
72
40
0.49
1.50
3.00
0.880
2.100
X
X
72R040X
0.40
0.80
72
40
0.56
2.00
3.80
0.550
1.290
X
X
72R050X
0.50
1.00
72
40
0.77
2.50
4.00
0.500
1.170
X
X
72R065X
0.65
1.30
72
40
0.88
3.25
5.30
0.310
0.720
X
X
72R075X
0.75
1.50
72
40
0.92
3.75
6.30
0.250
0.600
X
X
72R090X
0.90
1.80
72
40
0.99
4.50
7.20
0.200
0.470
X
X
72R110X
1.10
2.20
72
40
1.50
5.50
8.20
0.150
0.380
X
X
72R135X
1.35
2.70
72
40
1.70
6.75
9.60
0.120
0.300
X
X
72R160X
1.60
3.20
72
40
1.90
8.00
11.40
0.090
0.220
X
X
72R185X
1.85
3.70
72
40
2.10
9.25
12.60
0.080
0.190
X
X
72R250X
2.50
5.00
72
40
2.50
12.50
15.60
0.050
0.130
X
X
72R300X
3.00
6.00
72
40
2.80
15.00
19.80
0.040
0.100
X
X
72R375X
3.75
7.50
72
40
3.20
18.75
24.00
0.030
0.080
X
X
I
hold
= Hold current: maximum current device will pass without tripping in 23°C still air.
I
trip
= Trip current: minimum current at which the device will trip in 23°C still air.
V
max
= 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 (V
max
)
P
d
= Power dissipated from device when in the tripped state at 23°C still air.
R
min
= Minimum resistance of device in initial (un-soldered) state.
R
1max
= Maximum resistance of device at 23°C measured one hour after tripping or reflow
soldering of 260°C for 20 sec.
Caution: Operation beyond the specified rating may result in damage and possible arcing
and flame.
Description
Features
Applications
t7EDNBYWPMUBHFXNBY
40A short circuit rating
t3P)4DPNQMJBOU -FBE'SFF
and Halogen Free*
t3FTFUUBCMFGFBUVSF
t*EFBMGPSBCSPBESBOHFPG
general electronics using a
low voltage power supply
t-PBEQSPUFDUJPOPOXJEF
range of low voltage power
supplies
t$PNQVUFST
t$PNQVUFSQFSJQIFSBMT
t(FOFSBMFMFDUSPOJDT
* Effective January 1, 2010, all 72R PTC products will be manufactured Halogen Free (HF). Existing Non-Halogen Free 72R PTC products may continue to be sold, until supplies are depleted.