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POLYFUSE ? Resettable PTCs
Radial Leaded > 72R Series
72R Series
Description
The 72R Series is designed to provide overcurrent
protection to 72Vdc maximum voltage with a maximum
40A short circuit rating.
Features
40A short circuit rating
general electronics using a
and Halogen Free*
low voltage power supply
Agency Approvals
Applications
AGENCY
AGENCY FILE NUMBER
E183209
R50119318
Electrical Characteristics
range of low voltage power
supplies
Part Number
I hold
(A)
I trip
(A)
V max
(Vdc)
I max
(A)
P d
typ.
(W)
Maximum Time
To Trip
Current Time
(A) (Sec.)
Resistance
R min R 1max
( Ω ) ( Ω )
Agency
Approvals
72R020X
72R025X
72R030X
72R040X
72R050X
72R065X
72R075X
72R090X
72R110X
72R135X
72R160X
72R185X
72R250X
72R300X
72R375X
0.20
0.25
0.30
0.40
0.50
0.65
0.75
0.90
1.10
1.35
1.60
1.85
2.50
3.00
3.75
0.40
0.50
0.60
0.80
1.00
1.30
1.50
1.80
2.20
2.70
3.20
3.70
5.00
6.00
7.50
72
72
72
72
72
72
72
72
72
72
72
72
72
72
72
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
0.41
0.45
0.49
0.56
0.77
0.88
0.92
0.99
1.50
1.70
1.90
2.10
2.50
2.80
3.20
1.00
1.25
1.50
2.00
2.50
3.25
3.75
4.50
5.50
6.75
8.00
9.25
12.50
15.00
18.75
2.20
2.50
3.00
3.80
4.00
5.30
6.30
7.20
8.20
9.60
11.40
12.60
15.60
19.80
24.00
1.830
1.250
0.880
0.550
0.500
0.310
0.250
0.200
0.150
0.120
0.090
0.080
0.050
0.040
0.030
4.400
3.000
2.100
1.290
1.170
0.720
0.600
0.470
0.380
0.300
0.220
0.190
0.130
0.100
0.080
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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 )
R 1max = Maximum resistance of device at 23°C measured one hour after tripping or re?ow
soldering of 260°C for 20 sec.
Caution: Operation beyond the speci?ed rating may result in damage and possible arcing
and ?ame.
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.
* 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.
? 2010 Littelfuse, Inc
Speci?cations are subject to change without notice.
Please refer to www.littelfuse.com/series/72R.html for current information.
91
Revised: July 12, 2010
72R Series
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