Resistors
Aluminium Housed
Wirewound Resistors
WH Series
High power dissipation up to 300W
All welded construction
Suitable for severe environments
Designed for excellent thermal conductivity to heatsink
Spade terminal option
RoHS compliant
All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
Electrical Data
WH5
WH10
WH25
WH50
Notes
2
1, 2
Power rating at 25°C
watts
10
15
25
50
On standard heatsink
Resistance range
ohms
0R01 to 10K
0R01 to 20K
0R01 to 44K
0R015 to 120K
TCR (-55° to 200°C)
ppm/°C
<10R: ±75 ≥10R to <100R: ±50 ≥100R: ±25
Resistance tolerance
%
1(F), 2(G), 5(J) and 10(K)
Low value limits
ohms
1R at 1% 0R5 at 2% 0R05 at 5% 0R01 at 10%
WH50 0R015 at 10%
Isolation voltage
volts
1500
1500
3000
3000
DC or AC peak
Note 1: For load at full rating mount on aluminium heatsink 30.5cm x 30.5cm x 1.5mm Note 2: WH25T & WH50T are additionally rated at 15A
CECC 40203-006 Requirements *
AA
BA
CA
DA
Notes
Power rating at 25°C
watts
10
15
25
40
On standard heatsink
Resistance range
ohms
0R05 to 3K4
0R05 to 15K
0R05 to 33K
0R05 to 82K
TCR (-55° to 200°C)
ppm/°C
≥5R to ≤10R: ± 100 >10R: ±50
Resistance tolerance
%
1(F), 2(G), and 5(J)
Low value limits
ohms
1R at 1% 0R5 at 2% 0R05 at 5%
Isolation voltage
volts
1000
1000
2000
2000
DC or AC peak
* This table indicates the CECC specification requirements which are met or exceeded by the corresponding WH series products
Limiting element voltage
Standard values
Thermal impedance
Ambient temperature range
volts
°C/watt
°C
150
16.0
250
500
E24 preferred range
10.0
6.0
-55 to 200
1250
3.5
DC or AC rms
Other values to order
On standard heatsink
WH100
Power rating at 25°C
Resistance range
TCR (-55° to 200°C)
Resistance tolerance
Low value limits
Isolation voltage
Limiting element voltage
Standard values
Thermal impedance
Ambient temperature range
watts
ohms
ppm/°C
%
ohms
volts
volts
°C/watt
°C
100
0R01 to 70K
WH200
WH300
Notes
On standard heatsink
200
300
0R01 to 50K
0R01 to 68K
≤1K0: ±100 >1K0: ±25
Standard 5(J) and 10(K). Also available: 1(F) and 2(G)
Typically ≥0R05: ±5% ≤0R047: ±10%
6360
7070
7070
1900
1900
2500
E24 preferred range
1
0.7
0.6
-55 to 200
DC or AC peak
DC or AC rms
Other values to order
On standard heatsink
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
07.18
Aluminium Housed
Wirewound Resistors
WH Series
Physical Data
Dimensions (mm) & Weight (g)
WH5, 10, 25 & 50
A
B
Type
Max
±0.3
WH5
30
12.4
WH10
36.5
15.9
1
WH25
51
19.8
2
WH50
72.5
21.4
WH100, 200 & 300
A
B
Max
Max
WH100
47.5
88
WH200
72.5
145.7
WH300
72.5
184.4
Note 1: A
max
for WH25T is 71.3
C
±0.3
11.3
14.3
18.3
39.7
C
Max
24.1
41.8
41.8
E
Min
1.9
1.9
2.8
2.8
F
Max
17
21
28
30
G
Max
9
11
15
16
H
Dia ±0.2
2.4
2.4
3.3
3.3
L
Max
17.0
21.0
29.0
51.0
M
±0.5
4.3
5.2
7.2
7.9
N
Max
1.8
2.2
2.6
2.6
Dt
Min
2.5
2.9
4.3
5.1
Dt
Min
7.0
15
15
Wt
Nom
3.6
5.6
13
29
Wt.
Nom
115
475
700
D
E
F
G
Max
Max
±0.3
±0.3
27.3
65.2
35
37
45.5
89.7
70
57.2
45.5
127.7
104
59
Note 2: A
max
for WH50T is 95.5
H
J
K
L
M
3
Max
Max
Max
Nom
Max
11.8
15.4
3.7
4.4
-
20.5
10.4
5.5
5.1
103.4
20.5
12.4
5.5
6.6
141.4
Note 3: WH100: ±0.25, WH200 & 300: ±0.45
WH5, 10, 25 & 50
WH100
WH200 & 300
Spade terminal on
WH25T & WH50T
Nominal dims in mm
End face tracking distance = Dt
Construction
Cap and lead assemblies are fitted to a high purity
ceramic substrate. The resistive element is wound onto
the substrate and welded to the caps. The wound rod is
then moulded and fitted into aluminium housing to give
optimum stability and reliability.
Marking
The resistors are legend marked with type reference,
resistance value and tolerance which will withstand all
accepted industrial cleaning fluids. Values are marked
in accordance with IEC 62.
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
07.18
Aluminium Housed
Wirewound Resistors
WH Series
Terminations
WH5-100
Material
Strength
Solderability
Pb-free solder dipped, copper clad steel
The terminations meet the requirements
of IEC 68.2.21
The terminations meet the requirements
of IEC 115-1, clause 4.17.3.2
WH25T & 50T
WH200 & 300
Material
Strength
6.35mm (¼“) spade terminal
M6 threaded steel terminal with a
set of four nuts and washers
Termination robustness 50N max
Tightening torque 5Nm max
WH100, 200 & 300
Maximum
2
N/A
2
Performance Data
WH5, 10, 25 & 50
Actual
CECC 40203-006
Requirements
Maximum
Typical
Load at commercial rating: 1000hrs at 25°C
ΔR%
1
1
0.4
Load at CECC rating: 1000hrs at 25°C
ΔR%
1
1
0.4
Dry heat: 1000hrs at 200°C
ΔR%
1
1
0.4
Derating from 25°C
Zero at 200°C, see derating graph
Short-term overload
ΔR%
1
1
0.2
Climatic sequence
ΔR%
1
1
0.4
Climatic category
55/200/56
Long-term damp heat
ΔR%
1
0.5
0.2
Temperature rapid change
ΔR%
0.25
0.25
0.1
Resistance to solder heat
ΔR%
0.25
0.25
0.05
Vibration and bump
ΔR%
0.25
0.25
0.025
Noise (in decade of frequency)
μV/V
Not specified
0
0
Insulation resistance
ohms
1G min
10G min
Pulse and overload performance
Not specified
See graphs
Note: A 0.05 ohm addition is to be added to the performance of all resistors < 10 ohms.
0.25
WH100: 0.5
0
Pulse and Overload Performance
For short durations of
≤0.1s
the energy graph should
be used. For longer durations the overload graph
applies.
10
10000
1000
Energy (joules)
100
10
1
Multiple of Rated Power
WH25-300
WH300
WH200
WH100
WH50
WH25
WH10
WH5
WH5&10
WH5-50
WH100-300
1
0.1
1
10
Overload Duration (s)
100
1000
0.1
0.01
0.1
1
10
100
1000
Value (ohms)
10000 100000
Application Notes
After soldering, care should be taken to ensure that there are no flux residues on the end faces of the moulding
compound, otherwise insulation resistance will be reduced. The minimum surface tracking distances from termination
to casing are shown in the Physical Data tables as dimension Dt.
It is recommended that the resistor base should be coated thinly with heatsink compound before mounting to obtain
the stated operating characteristics. The heatsink compound increases thermal conductivity to the heatsink.
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
07.18
Aluminium Housed
Wirewound Resistors
WH Series
The standard aluminium heatsinks are defined in the table below. If smaller heatsinks are used then derating should
be applied as indicated in the graph below. If no heatsink is employed, use the ratings for 1cm
2
.
Reference heatsink dimensions
Type (CECC)
WH5 (AA)
WH10 (BA)
WH25 (CA)
WH50 (DA)
WH50 @ 50W
WH100
WH200
WH300
Thickness (mm)
1
1
1
1
1.5
3
3
3
Derating for reduced heatsink dimensions
Area (cm²)
410
410
544
544
930
1000
3800
5800
1000
WH300 25°C
WH300 70°C
WH200 25°C
WH200 70°C
Ma xim um Dis sipa tion (W)
100
WH100 25°C
WH100 70°C
WH50 25°C
DA 25°C
DA 70°C
WH25/CA 25°C
WH25/CA 70°C
WH10/BA 25°C
WH10/BA 70°C
WH5/AA 25°C
WH5/AA 70°C
Derating for ambient temperature
1 20
Proportion of Pr (%)
1 00
80
60
40
20
0
0
10 0
20 0
A m b ie n t T e m p e ra tu r e (°C )
10
1
1
10
100
Heatsink Surface Area (cm )
2
1000
10000
Packaging
WH resistors are packed in plastic bags and boxed.
Ordering Procedure
Type
Termination
T
Standard
Spade terminal
Example: WH25 with spade terminals at 100 ohms with a 5% tolerance:
WH25T–100RJ
I
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
G
1%
2%
J
K
5%
10%
Packing
WH5, 10
I
WH25, 50
WH100
WH200, 300
Bulk
250/box
200/box
45/box
10/box
Standard
The following options apply toWH5, 10, 25 & 50 only:
For CECC released product state on order the CECC number and style. Example:
WH25-3K3JI CECC40203-006 CA
For SnPb finish instead of Pb-free replace the packing suffix with PB. Example:
WH25-3K3JPB
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
07.18
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
TT Electronics
:
WH5-33RJI WH50-R68JI WH25-10KJI WH50-10KJI WH50-1K0JI WH25-1K0JI WH25-10RJI WH50-10RJI
WH10-10RJI WH50-1K2JI WH50-5R6JI WH50-180RJI WH50-15RJI WH25-15RJI WH50-50RJI WH50-6R8JI
WH25-18RJI WH50-18RJI WH25-8K2JI WH25-47RJI WH50-47RJI WH50-30RJI WH25-3K9JI WH25-4R7JI
WH50-33RJI WH5-120RJI WH50-4R7JI WH50-27RJI WH25-4K7JI WH25-2R0JI WH50-2R0JI WH5-22RJI WH50-
2R2JI WH25-2R2JI WH50-270RJI WH50-22RJI WH50-22KJI WH25-R10JI WH25-470RJI WH5-4R7JI WH25-
22RJI WH25-220RJI WH50-16KJI WH50-220RJI WH5-100RJI WH50-150RJI WH5-10RJI WH50-2K2JI WH25-
2K2JI WH25-68RJI WH50-20RJI WH25-56RJI WH5-27RJI WH25-3R9JI WH25-R33JI WH5-330RJI WH50-24RJI
WH10-100RJI WH50-100RJI WH50-5R0JI WH25-39RJI WH25-100RJI WH25-27RJI WH25-24RJI WH50-1R0JI
WH25-1R0JI WH5-68RJI WH25-12RJI WH50-12RJI WH25-1R5JI WH25-10RFI WH25T-1K0JI WH100-300RJ
WH25-6R8GI WH200-4R7JI WH300-10RJI WH10-240RJI WH5-6R8JI WH10-150RJI WH25-120RJI WH5-R33JI
WH25-6R8JI WH50-50KJI WH5-270RJI WH50-4K7JI WH50-390RJI WH10-220RJI WH25-680RJI WH25-33RJI
WH5-56RJI WH10-22RJI WH50-3R3JI WH10-270RJI WH5-3K3JI WH25-330RJI WH10-470RJI WH10-56RJI
WH50-470RJI WH5-15RJI WH200-3R3JI
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