RESISTOR, WIREWOUND, 250OHM, 12W, 10%

D12K250E

Manufacturer Part NumberD12K250E
DescriptionRESISTOR, WIREWOUND, 250OHM, 12W, 10%
ManufacturerOhmite
Series210
D12K250E datasheet
 


Specifications of D12K250E

Resistance250ohmResistance Tolerance± 10%
Power Rating12WResistor Element MaterialWirewound
Resistor Case StyleRadial LugsTemperature Coefficient± 260ppm/°C
Tolerance10 %Operating Temperature Range+ 25 C to + 350 C
Dimensions7.94 mm Dia. x 44.4 mm LProductPower Resistors Wire Wound Vitreous Enamel
Material, ElementWirewoundPackage TypeAdjustable Tubular
Power, Rating12 WTerminationLug
Voltage, Rating55 VACLead Free Status / RoHS StatusLead free / RoHS Compliant
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210 Series
Dividohm
Vitreous enamel
®
adjustable Power
D
C
L
series
Wattage
Ohms
L
12
1.0-10K
1.75 / 44.4
D12
D25
25
1.0-25K
2.0 / 50.8
D50
50
1.0-100K
4.0 / 101.6
75
1.0-100K
6.0 / 152.4
D75
D100
100
1.0-100K
6.5 / 165.1
D175
175
1.0-100K
8.5 / 215.9
D225
225
1.0-100K
10.5 / 266.7
D500
500
1.5-15K
12.0 / 304.8
D1000
1000
3.0-27.7K
20.0 / 508.0
Other sizes available; contact Ohmite. Also available in low cost Centohm or Silicone coating; contact Ohmite.
Choose Ohmite’s 210 Type adjustable resistors for applications
requiring settings at different resistance values. These wire-
wound resistors are equipped with an adjustable lug, making
them ideal for adjusting circuits, obtaining odd resistance values
and setting 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
construction. Mounting brackets not included with resistors.
o r d e r i n g i n f o
Coating
Blank = Vitreous
RoHS Compliant
C = Centohm
S = Silicone
� � � � � � � �
Series Wattage
Tolerance
Ohms
J = 5%
1R0 = 1 Ω
250 = 250 Ω
K = 10%
1K0 = 1,000 Ω
25K = 25,000 Ω
25K5 = 25,500 Ω
Wattage
Part No.
Prefix 
Suffix
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
 = Standard values; check availability using the worldwide inventory
search at www.ohmite.com
32
Ohmite Mfg. Co.
1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
F e a t u r e s
• 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. Add “E” suffix to part num-
ber to specify.
Dimensions (in. / mm)
Core
D
C
Code
0.313 / 7.94
0.188 / 4.76
D
0.562 / 14.3
0.313 / 7.94
K
0.562 / 14.3
0.313 / 7.94
K
0.562 / 14.3
0.313 / 7.94
K
0.750 / 19.1
0.50 / 12.7
M
1.125 / 28.6
0.75 / 19.1
P
1.125 / 28.6
0.75 / 19.1
P
2.50 / 63.5
1.75 / 44.5
S
2.50 / 63.5
1.75 / 44.5
S
s P e C i F i C a t i O N s
Adjustability is 10% to 90% of full
value. Wattage is proportional to
this adjusted resistance value.
Material
Coating: Lead free vitreous
enamel.
Core: Tubular ceramic.
m a d e - t o - o r d e r
Core Diameter
Terminal Type
See “Core and
See “Resistor Terminals
Terminal Selection”
for Tubular Cores”
RoHS Compliant
� � � � � � � � � � � � � �
Coating
Wattage
Ohms
R500 = 0.500 Ω
210 = Vitreous
1R00 = 1 Ω
410 = Silicone Ceramic
250R = 250 Ω
610 = Centohm
1K00 = 1,000 Ω
See website for custom
25K0 = 25,000 Ω
core and terminal info
25K5 = 25,500 Ω
S t a n d a r d p a r t n u m b e r S f o r 2 1 0 S e r i e S
Wattage
Part No.
Prefix 
Suffix
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
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.
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 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 intermediate
standard
point reduces the wattage rat-
Voltage
terminal
ing by approximately the same
565
57
proportion. Example: If the lug is
set at half resistance, the watt-
625
40
age is reduced by approximately
1625
40
one-half.
2625
40
Overload: 10 times rated wattage
2845
40
for 5 seconds.
3595
46
Temperature coefficient:
4595
46
±260 ppm/°C
Dielectric withstanding voltage:
4970
45
1000 VAC: 12 to 100 watt rating.
8900
45
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 36
for mounting hardware
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
Tolerance
12W
4,500Ω
J = 5%
K = 10%
25W
9,000Ω
50W
20,000Ω
75W
35,000Ω
100W
50,000Ω
Part No.
Prefix 
Suffix
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
No power
derating
necessary for
ratings higher
than 100W.
Wattage