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
50
On standard heatsink
Power rating at 25°C
watts
10
15
25
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
01.21
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
19.8
WH25
51
2
21.4
WH50
72.5
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
M
H
J
K
L
3
Max
Max
Max
Max
Nom
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
01.21
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
55/200/56
Climatic category
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
01.21
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
Example: WH25-100RJI
(WH25 at 100 ohms ±5%, Pb-free)
W
H
2
1
1
Type
5
2
2
Termination
-
1
0
3
3
Value
0
R
J
4
I
5
4
Tolerance
F = ±1%
G = ±2%
J = ±5%
K = ±10%
5
Packing & Termination Finish
I
All types
Standard packing & Pb-free
PB WH5, 10, 25 & 50 Standard packing & SnPb
WH5, WH10
250/box
WH25, WH50
200/box
Bulk
WH100
45/box
WH200, WH300
10/box
WH5
All types
Standard
E24 = 3/4
WH10
WH25, 6.35mm spade characters
T
WH50
terminals
R = ohms
WH25
K = kilohms
WH50
WH100
WH200
WH300
For CECC released product (WH5, 10, 25 & 50 only) state on order the CECC number and style. Example:
WH25-3K3JI CECC40203-006 CA
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
01.21
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