High Energy
Wirewound Resistors
33J: 0.593 / 15.1
35J: 0.937 / 23.8
30J: 1.842 / 46.8
1.5 / 38.1
33J: 0.218 / 5.5
35J: 0.343 / 8.7
30J: 0.406 / 10.3
33J: 20 ga.
35J: 18 ga.
30J: 18 ga.
825JxxxH: 1.938 / 49.23
1.080 / 27.43
0.546 / 13.87
RH3R0DBxxxJ: 0.612 / 15.545
Type
Axial
Axial
Axial
Heat Sinkable
Surface Mount
Energy
(J)
Fusing
Current
Energy (J) to fuse (A)
Power to
fuse (W)
33J1R0
33J5R0
33J10R
33J15R
33J20R
1
5
10
15
20
3
3
3
3
3
12.70
6.25
4.94
4.66
3.91
53.26
26.20
20.73
19.55
16.40
23.93
10.03
7.08
5.95
5.00
572.60
502.96
501.70
531.47
500.45
33J25R
33J30R
33J50R
33J100
35J1R5
25
30
50
100
1.5
3
3
3
3
5
3.07
2.97
2.43
1.92
76.55
12.89
12.46
10.20
8.07
321.19
4.20
3.92
2.97
2.10
40.32
441.79
460.80
440.68
439.58
2438.48
35J2R5
35J7R5
35J12R
35J18R
35J22R
2.5
7.5
12
18
22
5
5
5
5
5
64.65
37.66
37.90
28.80
27.48
271.23
158.01
158.99
120.84
115.29
31.59
16.90
14.20
11.13
10.03
2494.75
2141.89
2420.25
2228.50
2213.02
35J36R
35J47R
35J75R
30J2R0
30J4R7
36
47
75
2
4.7
5
5
5
10
10
22.78
23.22
18.77
162.30
150.86
95.59
97.42
78.77
680.93
632.92
7.86
7.08
5.55
47.98
33.88
2222.93
2358.00
2309.77
4603.79
5395.94
6.8
15
27
33
50
10
10
10
10
10
137.27
119.76
85.27
65.54
62.45
575.91
502.47
357.74
274.98
262.03
28.47
20.11
14.20
11.93
10.03
5513.41
6065.77
5445.56
4700.40
5029.59
Voltage
200
460
1000
520
200
10
10
10
25
25
51.90
49.41
46.61
51.04
39.92
217.74
207.28
195.54
214.12
167.49
7.86
7.08
5.95
40.32
20.11
5063.34
5017.03
5314.71
1625.65
2021.92
10
25
36
47
75
25
25
25
25
25
31.58
19.64
17.79
18.71
14.66
132.50
82.40
74.62
78.49
61.49
14.20
8.43
7.08
6.60
5.00
2016.87
1776.01
1806.13
2049.57
1876.69
825J100H
825J150H
RH3R0DBR500J
RH3R0DB1R00J
RH3R0DB2R70J
Tolerance
5%
5%
5%
5%
5%
82
100
150
1
5
825J10RH
825J25RH
825J36RH
825J47RH
825J75RH
0.273 / 6.934
Watts
3
5
10
25
3
Power
Part Number
30J82R
30J100
30J150
825J1R0H
825J5R0H
0.226 / 5.740
33Jxxx
35Jxxx
30Jxxx
825JxxxH
RH3R0DBxxxJ
Ohms
30J6R8
30J15R
30J27R
30J33R
30J50R
Axial Leaded / Surface Mount /
Heat Sinkable Packaging
in. / mm
S TA N D A R D PA RT N U M B E R S
100
150
0.5
1
2.7
25
25
3
3
3
12.29
11.59
12.93
10.23
6.87
51.56
48.64
54.25
42.91
28.82
4.20
3.53
31.59
22.31
13.24
1767.15
1872.00
498.95
497.70
473.33
RH3R0DB4R70J
RH3R0DB6R80J
RH3R0DB7R50J
RH3R0DB10R0J
RH3R0DB15R0J
4.7
6.8
7.5
10
15
3
3
3
3
3
5.87
5.34
4.75
3.98
3.75
24.63
22.41
19.91
16.70
15.75
10.03
8.43
7.86
6.60
5.55
472.78
483.07
463.11
436.08
461.95
RH3R0DB25R0J
RH3R0DB47R0J
RH3R0DB68R0J
RH3R0DB75R0J
25
47
68
75
3
3
3
3
3.07
2.28
2.08
2.29
12.89
9.59
8.72
9.62
4.20
2.97
2.49
2.49
441.79
414.24
423.26
466.83
RoHS compliant product available Jan. 06 Add “E” suffix to part number to specify.
Ohmite Manufacturing’s family
of High Energy Wirewound
Resistors employ special
winding techniques to maximize the effective joule rating
of each resistor. Most wirewound 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 substitution of resistance wire,
depending on material availability. 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 rating and fusing current of a
wirewound resistor, and this
is often the reason that the
manufacturer does not publish
a fixed joule rating.
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 packaging, 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. Non-inductive
versions can also be supplied,
along with the calculated joule
rating, fusing current, and
inductance to be expected.
Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
