30
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
Ohmite Mfg. Co.
STOCK PART NUMBERS FOR STANDARD RESISTANCE VALUES
210 Series
Dividohm
®
Vitreous Enamel
Adjustable Power Resistors
L
DC
=
Most popular stock values
=
Stock values
=
Non-stock values subject to minimum handling charge per item
1.0
–––
1R0
2
–––
2R0
3
–––
3R0
4
–––
4R0
5
–––
5R0
7.5
–––
7R5
10
–––
10R
15
–––
15R
20
–––
20R
25
–––
25R
50
–––
50R
75
–––
75R
100
–––
100
150
–––
150
200
–––
200
250
–––
250
300
–––
300
350
–––
350
400
–––
400
500
–––
500
600
–––
600
750
–––
750
800
–––
800
1,000
–––
1K0
1,250
–––
1K25
1,500
–––
1K5
2,000
–––
2K0
2,250
–––
2K25
2,500
–––
2K5
3,000
–––
3K0
3,500
–––
3K5
4,000
–––
4K0
4,500
–––
4K5
5,000
–––
5K0
6,000
–––
6K0
7,000
–––
7K0
7,500
–––
7K5
8,000
–––
8K0
8,500
–––
8K5
9,000
–––
9K0
10,000
–––
10K
12,000
–––
12K
15,000
–––
15K
20,000
–––
20K
25,000
–––
25K
30,000
–––
30K
35,000
–––
35K
40,000
–––
40K
45,000
–––
45K
50,000
–––
50K
60,000
–––
60K
75,000
–––
75K
80,000
–––
80K
100,000
–––
100K
Wattage
Wattage
Shaded values involve very fine resistance wire and should not be used
in critical applications without burn-in and/or thermal cycling.
Wattage
Ohmic value
D12K
–––
12
D50K
–––
50
D175K
–––
175
Part No.
Prefix
Suffix
D225K
–––
225
D500K
–––
500
D1000K
–––
1000
D25K
–––
25
D100K
–––
100
D75K
–––
75
Ohmic value
D12K
–––
12
D50K
–––
50
D100K
–––
100
D175K
–––
175
Part No.
Prefix
Suffix
D225K
–––
225
D500K
–––
500
D1000K
–––
1000
D25K
–––
25
D75K
–––
75
Ohmic value
D12K
–––
12
D50K
–––
50
D175K
–––
175
Part No.
Prefix
Suffix
D225K
–––
225
D25K
–––
25
D100K
–––
100
D75K
–––
75
Choose Ohmite’s 210 Type
adjustable resistors for appli-
cations requiring settings at
different resistance values.
These wirewound resistors
are equipped with an adjust-
able lug, making them ideal
for adjusting circuits, obtaining
odd resistance values and set-
ting equipment to meet various
line voltages.
210 Type resistors feature
a hollow core to permit secure
fastening with spring-type clips
or thru bolts with washers.
They also offer the durability
of lead free vitreous enamel
coating and all-welded con-
struction.
Mounting brackets not
included with resistors.
FEATURES
•
Terminals suitable for soldering
or bolt connection.
•
Adjustable lug supplied.
•
High wattage applications.
•
All-welded construction.
•
Rugged lead free vitreous enam-
el coating.
•
Flame resistant coating.
•
Thumb-screw-adjustable lug
available (Part No. 2160) for
1.125” core resistors.
•
RoHS compliant product avail-
able Jan. 2006 Add “E” suffix to
part number to specify.
Power limitations for
high resistance values:
When resistance exceeds
the resistance values
listed at right, derate the
Power Rating by 25% to
improve reliability:
Power
Resistance
rating
value
12W
4,500
Ω
25W
9,000
Ω
50W
20,000
Ω
75W
35,000
Ω
100W
50,000
Ω
No power derating necessary for
ratings higher than 100 watts.
Dimensions (in. /
mm
)
Series
Wattage
Ohms
Length
Diam.
Core
Voltage
D12
12
1.0-10K
1.0-10K
1.75 /
1.75 /
44.4
0.313 /
0.313 /
7.94
7.94
7.94 7.94
0.188 /
0.188 /
4.76
4.76
565
565
D25
25
1.0-25K
2.0 /
50.8
0.562 /
14.3
14.3 14.3
0.313 /
7.94
625
D50
D50
50
50
1.0-100K
1.0-100K
4.0 /
4.0 /
101.6
101.6
0.562 /
0.562 /
14.3
14.3
14.3 14.3
0.313 /
0.313 /
7.94
7.94
1625
1625
D75
75
1.0-100K
6.0 /
152.4
0.562 /
14.3
14.3 14.3
0.313 /
7.94
2625
D100
D100
100
100
1.0-100K
1.0-100K
6.5 /
6.5 /
165.1
165.1
0.750 /
0.750 /
19.1
19.1
0.50 /
0.50 /
12.7
12.7 12.7
2845
2845
D175
175
1.0-100K
8.5 /
215.9
1.125 /
28.6
28.6 28.6
0.75 /
19.1
3595
D225
D225
225
225
1.0-100K
1.0-100K
10.5 /
10.5 /
266.7
266.7
1.125 /
1.125 /
28.6
28.6
28.6 28.6
0.75 /
0.75 /
19.1
19.1
4595
4595
D500
500
1.5-15K
12.0 /
304.8
2.50 /
63.5
63.5 63.5
1.75 /
44.5
4970
D1000
D1000
1000
1000
3.0-27.7K
3.0-27.7K
20.0 /
20.0 /
508.0
508.0
2.50 /
2.50 /
63.5
63.5
63.5 63.5
1.75 /
1.75 /
44.5
44.5
8900
8900
Other sizes available. Consult factory.
Also available in low cost Centohm coating. Consult Factory.
SPECIFICATIONS
Material
Coating:
Lead free vitreous
enamel.
Core:
Tubular ceramic.
Terminals:
Solder coated radial
lug.
Adjustable terminal:
Nickel
plated steel. (Screwdriver type
adjustable lug supplied standard.
Other types, including silver con-
tact units, available.)
Derating:
Linearly from 100% @
+25°C to 0% @ +350°C.
Electrical
Tolerance:
±10% (K)
Power rating:
Based on 25°C
free air rating. The stated watt-
age rating applies only when the
entire resistance is in the circuit.
Setting the lug at an intermedi-
ate point reduces the wattage
rating by the approximate same
proportion. Example: If the lug is
set at half resistance, the watt-
age is reduced by approximately
one-half.
Overload:
10 times rated wattage
for 5 seconds.
Temperature coefficient:
±260 ppm/°C
Dielectric withstanding voltage:
1000 VAC: 12 to 100 watt rating.
3000 VAC: 175 and 225 watt rat-
ing (measured from terminal to
mounting bracket)
To calculate max. amps:
use the
formula
√
P/R.
See page 34
for mounting hardware
To calculate max. amps:
