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High Energy
Wirewound
Axial Terminal / Surface Mount /
Heat Sinkable Packaging
Ohmite Manufacturing’s family
of High Energy Wirewound
Resistors employ special
winding techniques to maxi-
mize the effective joule rating
of each resistor. Most wire-
wound resistors are wound
with the objective of meeting
the stated power (wattage)
rating and keeping cost low
through the use of automatic
winding equipment. Typically,
manufacturers will allow sub-
stitution of resistance wire,
depending on material avail-
ability. On tight tolerance
wirewounds some type of
abrasive adjustment to the
resistance wire is often used
to maximize production yields.
Both of these procedures can
adversely affect the joule rat-
ing and fusing current of a
wirewound resistor, and this
is often the reason that the
manufacturer does not publish
a fixed joule rating.
Type Watts Tolerance Voltage
33Jxxx Axial 3 5% 200
35Jxxx Axial 5 5% 460
30Jxxx Axial 10 5% 1000
825JxxxH Heat Sinkable 25 5% 520
RH3R0DBxxxJ Surface Mount 3 5% 200
1.5 / 38.1
33J: 0.593 / 15.1
35J: 1.000 / 25.4
30J: 1.842 / 46.8 33J: 0.218 / 5.5
35J: 0.343 / 8.7
30J: 0.406 / 10.3
33J: 20 ga.
35J: 18 ga.
30J: 18 ga.
RH3R0DBxxxJ: 0.612 / 15.545 0.273 / 6.934
0.226 / 5.740
825JxxxH: 1.938 / 49.23
1.080 / 27.43
0.546 / 13.87
in. / mm
STANDARD PART NUMBERS foR 30 SERiES
Energy Fusing Current Power to
Part Number Ohms Power (J) Energy (J) to fuse (A) fuse (W)
33J1R0 1 3 12.70 53.26 23.93 572.60
33J5R0 5 3 6.25 26.20 10.03 502.96
33J10R 10 3 4.94 20.73 7.08 501.70
33J15R 15 3 4.66 19.55 5.95 531.47
33J20R 20 3 3.91 16.40 5.00 500.45
33J25R 25 3 3.07 12.89 4.20 441.79
33J30R 30 3 2.97 12.46 3.92 460.80
33J50R 50 3 2.43 10.20 2.97 440.68
33J100 100 3 1.92 8.07 2.10 439.58
35J1R5 1.5 5 76.55 321.19 40.32 2438.48
35J2R5 2.5 5 64.65 271.23 31.59 2494.75
35J7R5 7.5 5 37.66 158.01 16.90 2141.89
35J12R 12 5 37.90 158.99 14.20 2420.25
35J18R 18 5 28.80 120.84 11.13 2228.50
35J22R 22 5 27.48 115.29 10.03 2213.02
35J36R 36 5 22.78 95.59 7.86 2222.93
35J47R 47 5 23.22 97.42 7.08 2358.00
35J75R 75 5 18.77 78.77 5.55 2309.77
30J2R0 2 10 162.30 680.93 47.98 4603.79
30J4R7 4.7 10 150.86 632.92 33.88 5395.94
30J6R8 6.8 10 137.27 575.91 28.47 5513.41
30J15R 15 10 119.76 502.47 20.11 6065.77
30J27R 27 10 85.27 357.74 14.20 5445.56
30J33R 33 10 65.54 274.98 11.93 4700.40
30J50R 50 10 62.45 262.03 10.03 5029.59
30J82R 82 10 51.90 217.74 7.86 5063.34
30J100 100 10 49.41 207.28 7.08 5017.03
30J150 150 10 46.61 195.54 5.95 5314.71
825J1R0H 1 25 51.04 214.12 40.32 1625.65
825J5R0H 5 25 39.92 167.49 20.11 2021.92
825J10RH 10 25 31.58 132.50 14.20 2016.87
825J25RH 25 25 19.64 82.40 8.43 1776.01
825J36RH 36 25 17.79 74.62 7.08 1806.13
825J47RH 47 25 18.71 78.49 6.60 2049.57
825J75RH 75 25 14.66 61.49 5.00 1876.69
825J100H 100 25 12.29 51.56 4.20 1767.15
825J150H 150 25 11.59 48.64 3.53 1872.00
RH3R0DBR500J 0.5 3 12.93 54.25 31.59 498.95
RH3R0DB1R00J 1 3 10.23 42.91 22.31 497.70
RH3R0DB2R70J 2.7 3 6.87 28.82 13.24 473.33
RH3R0DB4R70J 4.7 3 5.87 24.63 10.03 472.78
RH3R0DB6R80J 6.8 3 5.34 22.41 8.43 483.07
RH3R0DB7R50J 7.5 3 4.75 19.91 7.86 463.11
RH3R0DB10R0J 10 3 3.98 16.70 6.60 436.08
RH3R0DB15R0J 15 3 3.75 15.75 5.55 461.95
RH3R0DB25R0J 25 3 3.07 12.89 4.20 441.79
RH3R0DB47R0J 47 3 2.28 9.59 2.97 414.24
RH3R0DB68R0J 68 3 2.08 8.72 2.49 423.26
RH3R0DB75R0J 75 3 2.29 9.62 2.49 466.83
RoHS compliant product available; Add “E” suffix to part number to specify.
Ohmite High Energy
Wirewounds are hand
wound in order to maintain
the tightest possible pitch
(space between windings) and
thereby maximize the mass of
the resistive element. Since no
wire substitutions are allowed,
and no abrasive adjusting is
permitted in this family, Ohmite
can publish a fixed joule rating
and fusing current for each
part number in the series.
This technique can be
applied to any wirewound
product. In order to provide the
broadest selection of packag-
ing, Ohmite has developed
standard offerings in three
different package types-axial,
SMD, and heat sinkable. Other
sizes and types can be quoted
on request, such as tubular
power resistors.
(continued)
Check product availability
using the Worldwide Inventory
Search at ohmite.com
Ohmite Mfg. Co. 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 51
High Energy
Wirewound
Axial Terminal / Surface Mount /
Heat Sinkable Packaging
(continued)
PERfoRMANcE chARAcTERiSicS
Energy (J)
0
33J1R0
33J5R0
33J10R
33J15R
33J20R
33J25R
33J30R
33J50R
33J100
35J1R5
35J2R5
35J7R5
35J12R
35J18R
35J22R
35J36R
35J47R
35J75R
30J2R0
30J4R7
30J6R8
30J15R
30J27R
30J33R
30J50R
30J82R
30J100
30J150
20
40
60
80
100
120
140
160
180
Fusing Energy (J)
0
33J1R0
33J5R0
33J10R
33J15R
33J20R
33J25R
33J30R
33J50R
33J100
35J1R5
35J2R5
35J7R5
35J12R
35J18R
35J22R
35J36R
35J47R
35J75R
30J2R0
30J4R7
30J6R8
30J15R
30J27R
30J33R
30J50R
30J82R
30J100
30J150
100
200
300
400
500
600
700
Fusing Current (A)
0
33J1R0
33J5R0
33J10R
33J15R
33J20R
33J25R
33J30R
33J50R
33J100
35J1R5
35J2R5
35J7R5
35J12R
35J18R
35J22R
35J36R
35J47R
35J75R
30J2R0
30J4R7
30J6R8
30J15R
30J27R
30J33R
30J50R
30J82R
30J100
30J150
10
20
30
40
50
Energy (J)
0
-1R0H
-5R0H
-10RH
-25RH
-36RH
-47RH
-75RH
-100H
-150H
Fusing Energy (J)
825J-
Energy (J)
0
-R500J
-1R00J
-2R70J
-4R70J
-6R80J
-7R50J
-10R0J
-15R0J
-25R0J
-47R0J
-68R0J
-75R0J
RH3R0DB-
0
-1R0H
-5R0H
-10RH
-25RH
-36RH
-47RH
-75RH
-100H
-150H
825J-
Fusing Energy (J)
0
-R500J
-1R00J
-2R70J
-4R70J
-6R80J
-7R50J
-10R0J
-15R0J
-25R0J
-47R0J
-68R0J
-75R0J
RH3R0DB-
Fusing Current (A)
0
-1R0H
-5R0H
-10RH
-25RH
-36RH
-47RH
-75RH
-100H
-150H
825J-
Fusing Current (A)
0
-R500J
-1R00J
-2R70J
-4R70J
-6R80J
-7R50J
-10R0J
-15R0J
-25R0J
-47R0J
-68R0J
-75R0J
RH3R0DB-
10
20
30
40
50
60
50
100
150
200
250
5
10
15
20
25
30
35
40
45
2
4
6
8
10
12
14
0
10
20
30
40
50
60
5
10
15
20
25
30
35
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