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112
250 Series
‘Thin’ Stackohm®
Vitreous Enamel Power
CORE AND TERMINAL SELECTION
ForMadetoOrderType250StackohmResistors
Miniature
10 0.750”(19.050mm) 0.375”(9.525mm) 0.125”(3.175mm) 1 15,000 TA 1 1.000”(25.400mm) 0.375”(9.525mm) 51
15 1.000”(25.400mm) 0.375”(9.525mm) 0.125”(3.175mm) 1 25,000 TA 1 1.250”(31.750mm) 0.375”(9.525mm) 51
20 2.000”(50.800mm) 0.375”(9.525mm) 0.125”(3.175mm) 1 50,000 TA 1 2.313”(58.750mm) 0.375”(9.525mm) 51
12 0.688”(17.463mm) 0.594”(15.081mm) 0.234”(5.953mm) 1 20,000 TB ** 51
Intermediate
21 1.000”(25.400mm) 0.813”(20.638mm) 0.250”(6.350mm) 1 8,000 TD 2 1.313”(33.350mm) 0.594”(15.081mm) 51
25 1.500”(38.100mm) 0.813”(20.638mm) 0.250”(6.350mm) 1 15,000 TD 2 1.813”(46.050mm) 0.594”(15.081mm) 51
Standard
30 1.250”(31.750mm) 1.000”(25.400mm) 0.250”(6.350mm) 1 10,000 TE
5 1.750”(44.450mm)
0.938”(23.813mm) 57
3,4 2.000”(50.800mm)
40 2.000”(50.800mm) 1.000”(25.400mm) 0.250”(6.350mm) 1 25,000 TE
5 2.500”(63.500mm)
0.938”(23.813mm) 57
3,4 2.750”(69.850mm)
55 3.500”(88.900mm) 1.000”(25.400mm) 0.250”(6.350mm) 1 30,000 TE
5 4.000”(1.1.600mm)
0.938”(23.813mm) 57
3,4 4.250”(107.950mm)
70 4.750”(120.650mm) 1.000”(25.400mm) 0.250”(6.350mm) 1 120,000
‡
TE
5 5.250”(133.350mm)
0.938”(23.813mm) 57
3,4 5.500”(139.700mm)
95 6.000”(152.400mm) 1.000”(25.400mm) 0.250”(6.350mm) 1 150,000
‡
TE
5 6.500”(165.100mm)
0.938”(23.813mm) 57
3,4 6.750”(171,450mm)
Free Air
Wattage
Rating* Length L Width W Thickness T
Code
for
Core
Dia.
Min.
Ohms
Max.
Practical
Ohms
Standard
Terminal
Fig.
No. Dimension A Dimension B
*Basedonmountingonsteeelpanel10”(254mm)x10”x0.040”(1.016mm).
†
Insidedimensionsofcoreare:0.250”(6.350mm)x0.047”(1.191mm)forTA;0.406”
(10.319mm)x0.047”(1.191mm)forTB;0.438”(11.113mm)x0.063”(1.588mm)forTD;
0.672”(17.069mm)x0.063”(1.588mm)forTE.
Core Dimensions
†
‡
ThesesizesareOhmicone(silicone-ceramic)coated–type450-460.
**Usersuppliesbrackets.
1 –––1R0E
1.5 –––1R5E
2 –––2R0E
3 –––3R0E
4 –––4R0E
5 –––5R0E
7.5 –––7R5E
10 –––10RE
15 –––15RE
20 –––20RE
25 –––25RE
30 –––30RE
40 –––40RE
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
7,500 –––7K5E
10,000 –––10KE
15,000 –––15KE
20,000 –––20KE
25,000 –––25KE
40,000 –––40KE
=Standardvalues;
checkavailabilityat
www.ohmite.com
Ohmic value
F10J––– 10
F20J––– 20
F30J––– 30
F40J––– 40
Wattage
Part No.
Prefix
Suffix
F55J––– 55
Ohmic value
F10J––– 10
F20J––– 20
F30J––– 30
F40J––– 40
Wattage
Part No.
Prefix
Suffix
F55J––– 55
Wattage
Ohmic value
F10J––– 10
F20J––– 20
F30J––– 30
F40J––– 40
Part No.
Prefix
Suffix
F55J––– 55
See web-
site for
custom
core info
Tolerance
F= 1%
H= 3%
J= 5%
K= 10%
Ohms
1R0 = 1Ω
250 = 250Ω
1K0 = 1,000Ω
25K = 25,000Ω
25K5 = 25,500Ω
RoHS CompliantSeries
WattageCoating
Blank =Vitreous
C=Centohm
S=Silicone
Ohms
Example:
1R00 = 1Ω
250R = 250Ω
1K00 = 1,000Ω
25K0 = 25,000Ω
25K5 = 25,500Ω
Series
Vitreous enamel:
25 = 250 Fixed
26 = 260 Adjustable
Silicone ceramic:
45 = 450 Fixed
46 = 460 Adjustable
Wattage &
Core Code
See “Core and
Terminal Selection”
Terminal Type
See “Resistor Terminals for Tubular Cores”
Mounting Brackets
(user supplies bracket for core TB)
B= Stacking box
S= Stacking stud, std. height
H= Stacking stud high
U= Unit type
RoHS
Compliant
Tolerance
J= 5%
ORDERING INFORMATION
Made-to-order Parts
Standard Values