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Series Wattage Ohms Core Code Voltage Standard Terminal
D12 12 1.0-10K D 565 57
D25 25 1.0-25K K 625 40
D50 50 1.0-100K K 1625 40
D75 75 1.0-100K K 2625 40
D100 100 1.0-100K M 2845 40
D175 175 1.0-100K P 3595 46
D225 225 1.0-100K P 4595 46
D500 500 1.5-15K S 4970 45
D1000 1000 3.0-27.7K S 8900 45
Other sizes available; contact Ohmite. Also available in low cost Centohm or Silicone coating; contact Ohmite.
Adjustability 10% to 90% of full value. Wattage is proportional to this adjusted
resistance value.
Coating Lead free vitreous enamel. Large models (500 watts and up) are
supplied in Silicone Ceramic. Also available in low-cost Centohm
coating; Consult factory.
Core Tubular ceramic.
Terminals Solder coated radial lug. RoHS solder composition is 96% Sn,
3.5% Ag, 0.5% Cu
Adjustable
terminal
Nickel plated steel. (Screwdriver type adjustable lug supplied
standard. Other types, including silver contact units, available.)
Derating Linearly from 100% @ +25°C to 0% @ +350°C.
Tolerance ±10% (K)
Power rating Based on 25°C free air rating. The stated wattage rating applies
only when the entire resistance is in the circuit. Setting the lug at
an intermediate point reduces the wattage rating by approximately
the same proportion. Example: If the lug is set at half resistance,
the wattage is reduced by approx. 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)
Max. amps To calculate, use the formula √P/R.
210 Series
Dividohm® Vitreous Enamel
Adjustable Power
Choose Ohmite’s 210 Type adjustable resistors for
applications requiring settings at different resistance
values. These wirewound resistors are equipped with
an adjustable lug, making them ideal for adjusting
circuits, obtaining odd resistance values and set-
ting equip ment 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 construction.
Mounting brackets not included with resistors.
FEATURES
•Terminalssuitableforsolderingorboltconnection.
•Adjustablelugsupplied
•Highwattageapplications
•All-weldedconstruction
•Ruggedleadfreevitreousenamelcoating.
•Flameresistantcoating
•Additionaladjustablelugsavailable
•RoHScompliantproductavailable.Add“E”suffixto
part number to specify
CHARACTERISTICS
SERIES SPECIFICATIONS
Power limitations for high resis-
tance values: When resistance
exceeds the resistance values listed
below, derate the Power Rating by
25% to improve reliability:
Power Resistance
rating value
12W 4,500Ω
25W 9,000Ω
50W 20,000Ω
75W 35,000Ω
100W 50,000Ω
No power
derating neces-
sary for ratings
higher than
100W.
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110
L
DC
=Standardvalues;checkavailabilityat
www.ohmite.com
1.0 –––1R0E
2 –––2R0E
3 –––3R0E
4 –––4R0E
5 –––5R0E
7.5 –––7R5E
10 –––10RE
15 –––15RE
20 –––20RE
25 –––25RE
50 –––50RE
75 –––75RE
100 –––100E
150 –––150E
200 –––200E
250 –––250E
300 –––300E
400 –––400E
500 –––500E
750 –––750E
800 –––800E
1,000 –––1K0E
1,250 –––1K25E
1,500 –––1K5E
2,000 –––2K0E
2,500 –––2K5E
3,000 –––3K0E
4,000 –––4K0E
5,000 –––5K0E
6,000 –––6K0E
7,000 –––7K0E
7,500 –––7K5E
10,000 –––10KE
12,000 –––12KE
15,000 –––15KE
20,000 –––20KE
25,000 –––25KE
50,000 –––50KE
100,000 –––100KE
Wattage Wattage 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
See 270 series custom core
and terminal info
Tolerance
J= 5%
K= 10%
Ohms
1R0 = 1Ω
250 = 250Ω
1K0 = 1,000Ω
25K = 25,000Ω
25K5 = 25,500Ω
RoHS Compliant
Series Wattage
Coating
Blank =Vitreous
C=Centohm
S=Silicone
50KΩ and 100KΩ resistance values involve very fine resistance wire and should not be
used in critical applications without burn-in and/or thermal cycling.
Tolerance
J= 5%
K= 10%
Core Diameter
See “Core and
Terminal Selection”
Ohms
R500 = 0.500Ω
1R00 = 1Ω
250R = 250Ω
1K00 = 1,000Ω
25K0 = 25,000Ω
25K5 = 25,500Ω
RoHS Compliant
Coating
210 = Vitreous
410 = Silicone Ceramic
610 = Centohm
Wattage
Terminal Type
See “Resistor Terminals
for Tubular Cores”
Series Wattage L D C Core Code Standard Terminal
D12 12 1.75 / 44.4 0.313 / 7.94 0.188 / 4.76 D 57
D25 25 2.0 / 50.8 0.562 / 14.3 0.313 / 7.94 K 40
D50 50 4.0 / 101.6 0.562 / 14.3 0.313 / 7.94 K 40
D75 75 6.0 / 152.4 0.562 / 14.3 0.313 / 7.94 K 40
D100 100 6.5 / 165.1 0.750 / 19.1 0.50 / 12.7 M 40
D175 175 8.5 / 215.9 1.125 / 28.6 0.75 / 19.1 P 46
D225 225 10.5 / 266.7 1.125 / 28.6 0.75 / 19.1 P 46
D500 500 12.0 / 304.8 2.50 / 63.5 1.75 / 44.5 S 45
D1000 1000 20.0 / 508.0 2.50 / 63.5 1.75 / 44.5 S 45
210 Series
Dividohm® Vitreous Enamel
Adjustable Power
DIMENSIONS
(in. / mm)
ORDERING INFORMATION
Made-to-order Parts
Standard Values
