Resistors
Wirewound Power
Radial Terminal Resistor
WPRT Series
10 to 50 watts
Quick connect or soldered tag terminals
Optional mounting bracket
High overload capability
AEC-Q200 qualified
Flameproof case
RoHS compliant
All parts are Pb-free and comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
Electrical Data
WPRT10
Power rating at 25°C
Power rating at 70°C
5s overload rating at 25°C
Resistance range
Thermal impedance
Isolation voltage
TCR
Resistance Tolerance
Standard Values
Ambient temperature range
°C
watts
watts
watts
ohms
°C/watt
volts
ppm/°C
%
10
10
50
1R0 - 820R
18
WPRT15
15
12.3
75
1R0 – 1K0
14
WPRT20
20
16.4
100
2R0 – 1K2
12
1000
<20R: ±400, ≥20R: ±350
±5
E24
-55 to +155
WPRT30
30
24.6
150
3R0 – 1K5
8.5
WPRT40
40
32.8
200
6R0 – 1K5
7
WPRT50
50
41
250
6R0 – 1K5
7
Note: No LEV applies. Maximum voltage (dc or rms) is √(P x R)
Physical Data
Figure 1 - soldered tag (S) and the same with bracket (SB)
Figure 2-soldered tag with rugged bracket (SR)
All dimensions in mm and weights in g Maximum bow on length and width <1.00mm
Type
WPRT10
WPRT15
WPRT20
WPRT30
WPRT40
WPRT50
L
±1.5
48
48
63
75
90
90
W
±1.0
10
12.5
12.5
19
19
19
D
9.0±1.0
11.5±1.0
13.5±1.0
19±1.0
19±0.6
19±0.6
P
±1.0
32
32
44
54
70
70
ØJ
±0.2
4.1
4.1
4.1
4.1
4.1
4.1
C
±0.4
5.5
6.2
6.2
7.6
7.6
7.6
ØB
±0.2
2.5
2.5
2.5
3.2
3.2
3.2
K
±1.0
3.0
3.0
3.0
4.0
4.0
4.0
F
±0.5
8.7
8.0
10.0
9.5
9.5
9.5
G
±0.5
5.0
6.0
6.0
7.5
7.5
7.5
E
±0.5
12
12
12
18
18
18
M1
±0.1
4.2
4.2
4.2
4.2
5.2
5.2
M2
±0.1
4.2
4.2
4.2
4.2
4.5
4.5
H
±1.0
18
21
21
32
32
32
N
±0.2
23
23
23
39
39
39
S
±0.3
60
60
74
88
104
104
R
±0.3
72
72
86.5
105
122
122
Weight (nom.)
S
11
18
27
66
81
81
SB
16.5
24
34
80
94
94
SR
18.5
27.5
37.5
87.5
105.5
105.5
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
06.18
All dimensions inin mm and weights in g
All dimensions mm and weights in g
Maximum bow on length and width <1.00mm
Maximum bow on length and width <1.00mm
All dimensions inin mm and weights in g
All dimensions mm and weights in g
Maximum bow on length and width <1.00mm
Maximum bow on length and width <1.00mm
Type
Type
±1.0
1.5
1.5
Power
1.0
Wirewound
±1.0
DD
1.0
WPRT10
WPRT10
48
48
10
10
9.0±1.0
9.0±1.0
32
Radial Terminal
11.5±1.0 32
Resistor
WPRT15
WPRT15
48
48 12.5
12.5 11.5±1.0 32
32
LL
W
W
PP
ØJ
ØJ
C
C
ØB
ØB
K
K
FF
G
G
EE
M1
M1 M2
M2
H
H
N
N
SS
R
R
0.2 0.4 0.2 1.0 0.5 0.5 0.5 0.1 0.1 1.0 0.2 0.3 0.3
0.2 0.4 0.2 1.0 0.5 0.5 0.5 0.1 0.1 1.0 0.2 0.3 0.3
4.1
4.1
4.1
4.1
4.1
4.1
6.0
6.0
6.0
6.0
6.0
6.0
5.5
5.5
6.2
6.2
6.2
6.2
7.6
7.6
7.6
7.6
7.6
7.6
2.5
2.5
2.5
2.5
2.5
2.5
3.2
3.2
3.2
3.2
3.2
3.2
3.0
3.0
3.0
3.0
3.0
3.0
4.0
4.0
4.0
4.0
4.0
4.0
8.7
8.7
8.0
8.0
10.0
10.0
9.5
9.5
9.5
9.5
9.5
9.5
5.0
5.0
6.0
6.0
6.0
6.0
7.5
7.5
7.5
7.5
7.5
7.5
12
12
12
12
12
12
18
18
18
18
18
18
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
5.2
5.2
5.2
5.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.5
4.5
4.5
4.5
18
18
21
21
21
21
32
32
32
32
32
32
23
23
23
23
23
23
39
39
39
39
39
39
60
60
72
72
60
60
72
72
74
74 86.5
86.5
88
88 105
105
104
104 122
122
104
104 122
122
Weight
(nom.)
Weight
(nom.)
SS SB
SB
SR
SR
11 16.5
11 16.5 18.5
18.5
18
18 24
24
27.5
27.5
27
27 34
34
37.5
37.5
66
66 80
80
87.5
87.5
81
81 94
94 105.5
105.5
81
81 94
94 105.5
105.5
WPRT Series
WPRT30
WPRT30
75
75
WPRT40
WPRT40
WPRT50
WPRT50
90
90
90
90
WPRT20
WPRT20
63
63
12.5 13.5±1.0
12.5 13.5±1.0
19
19
19±1.0
19±1.0
19
19
19±0.6
19±0.6
19
19
19±0.6
19±0.6
44
44
54
54
70
70
70
70
Physical Data
thetwo fixing holes from circles to slots, delete dimension Ø4.20.2, and add dimensions M1 &&M2.
Figure 44––change the two fixing holes from circles to slots, delete dimension Ø4.20.2, and add dimensions M1 M2.
Figure
change
Figure 3 - quick connect “amp” tag (A)
and the same with bracket (AB)
Figure 33- -
quick connect “amp” tag (A) and the same with
Figure
quick connect “amp” tag (A) and the same with
bracket (AB)
bracket (AB)
In table, add columns for M1 & M2, correct second column headed LLto SSand change tolerances for N, SS& R.
In table, add columns for M1 & M2, correct second column headed to and change tolerances for N, & R.
Figure 4 - quick connect “amp” tag with
rugged bracket (AR)
Figure 44- -
quick connect “amp” tag with rugged bracket (AR)
Figure
quick connect “amp” tag with rugged bracket (AR)
All dimensions in mm and weights in g Maximum bow on length and width <1.00mm
Type
WPRT10
L
±1.5
48
W
±1.0
10
D
9.0±1.0
P
±1.0
32
ØJ
±0.2
4.1
K
±1.0
3.0
F
±0.5
8.7
G
±0.5
5.0
E
±0.5
12
All dimensions inin mm and weights in g
All dimensions mm and weights in g
Maximum bow on length and width <1.00mm
Maximum bow on length and width <1.00mm
All dimensions inin mm and weights in g
All dimensions mm and weights in g
Maximum bow on length and width <1.00mm
Maximum bow on length and width <1.00mm
Type
Type
LL
W
W
1.5
±1.0
1.5
±1.0
48
48
12.5
48
48
63
63
12.5
75
75
19
90
90
90
90
19
D
D
PP
ØJ
ØJ
K
K
FF
G
G
EE
M1
M1 M2
M2
H
H
N
N
SS
R
R
1.0 0.2 1.0 0.5 0.5 0.5 0.1 0.1 1.0 0.2 0.3 0.3
1.0 0.2 1.0 0.5 0.5 0.5 0.1 0.1 1.0 0.2 0.3 0.3
32
32
4.1
32
32
44
44
4.1
54
54
6.0
70
70
70
70
6.0
4.1
4.1
3.0
4.1
4.1
4.1
4.1
3.0
6.0
6.0
4.0
6.0
6.0
6.0
6.0
4.0
3.0
3.0 8.7
8.7
8.0
6.0
3.0
3.0 8.0
8.0
3.0
3.0 10.0
10.0
10.0
6.0
4.0
4.0 9.5
9.5
9.5
9.5
4.0
4.0 9.5
7.5
4.0
4.0 9.5
7.5
9.5
9.5
5.0
5.0
12
6.0
6.0
6.0
12
6.0
7.5
7.5
7.5
18
7.5
7.5
18
7.5
12
12
4.2
4.2 4.2
4.2
18
18
4.2
4.2
23.5
12
12
4.2
4.2 4.2
4.2
21
21
12
4.2
4.2
4.2
4.2
25
21
12
4.2 4.2
21
18
18
4.2
4.2 4.2
4.2
32
32
18
4.2
5.2
4.2
4.5
30
32
18
5.2 4.5
32
18
5.2
5.2
4.5
4.5
30
32
18
5.2 4.5
32
M1
±0.1
4.2
M2
±0.1
4.2
H
±1.0
19
N
±0.2
23
S
±0.3
60
R
±0.3
72
Weight (nom.)
A
Weight
(nom.)
AR
AB
Weight
(nom.)
11
16.5
SS SB
SB
11 16.5
11 16.5
18
24
18
18 24
24
27
27
34
27
34
34
66
66 80
80
66
94
80
81
81
94
81
81
94
81
94
94
81
94
18.5
SR
SR
18.5
18.5
27.5
27.5
27.5
37.5
37.5
37.5
87.5
87.5
87.5
105.5
105.5
105.5
105.5
105.5
105.5
WPRT10
WPRT10
WPRT15
48
WPRT15
WPRT15
WPRT20
WPRT20
WPRT20
63
WPRT30
WPRT30
WPRT30
75
WPRT40
WPRT40
WPRT50
WPRT50
WPRT40
90
10
10
9.0±1.0
9.0±1.0
11.5±1.0
32
12.5 11.5±1.0
12.5 11.5±1.0
12.5 13.5±1.0
12.5 13.5±1.0
13.5±1.0
44
19
19
19±1.0
19±1.0
19±1.0
19±0.6
54
19
19
19±0.6
19
19
19±0.6
19±0.6
19±0.6
70
23
23
60
60
72
72
23
60
72
23
23
60
60
72
72
23
74
86.5
86.5
23
23
74
74
86.5
39
39
88
88 105
105
39
39
88
39
104
105
104 122
122
39
104
39 104
122
104 122
122
39
WPRT50
90
19
19±0.6
70
6.0
4.0
9.5
7.5
18
5.2
4.5
30
39
104
122
Figure 5 – as configuration A but with tighter tolerance terminal alignment (AT) and the same with bracket (AD)
All dimensions in mm and weights in g
Maximum bow on length and width <1.00mm
Type
WPRT10
WPRT15
WPRT20
WPRT30
WPRT40
WPRT50
L
+0.5/-1.0
48
48
63
75
90
90
W
+0.5/-1.0
10
12.5
12.5
19
19
19
D
9.0 ±1.0
11.5 ±1.0
13.5 ±1.0
19 ±1.0
19 ±0.6
19 ±0.6
P
±0.3
32
32
44
54
68
68
ØJ
±0.2
4.1
4.1
4.1
6.0
6.0
6.0
K
±1.0
3.0
3.0
3.0
4.0
4.0
4.0
F
±0.5
8.7
8.0
10.0
9.5
9.5
9.5
G
±0.5
5.0
6.0
6.0
7.5
7.5
7.5
E
±0.5
12
12
12
18
18
18
H
±1.0
19
23.5
25
30
30
30
Weight (nom.)
AT
11
18
27
66
81
81
AD
16.5
24
34
80
94
94
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
06.18
Wirewound Power
Radial Terminal Resistor
WPRT Series
Construction
A high purity ceramic rod, with force fit end caps onto which is wound a wire element. The element is fitted into a ceramic case with
fireproof insulation cement. The terminal material is tin plated steel.
Name
1
2
3
4
5
6
Rod
Filling Material
Ceramic Case
Terminal
Bracket
Wire Element
Main Material
Al
2
O
3
SiO
2
Al
2
O
3
CaO
Steel (tin plated)
Steel
Resistance Alloy
Termination Strength:
The terminations meet the requirements of IEC 86.2.21
Marking:
Power rating, resistance value and tolerance are legend marked.
Flammability:
The resistor will not burn under any condition of applied temperature or overload.
Solvent resistance:
The body protection and marking are resistant to all normal industrial solvents suitable for printed circuits.
Performance Data
Maximum
Load at rated power (1000hrs at 25°C and 70ºC)
Derating from rated power
Short term overload (5 x rated power)
Damp heat steady state (56 days, 40°C, ≥90% RH)
Temperature rapid change (5 cycles -55ºC to +155ºC)
Resistance to solder heat
Voltage Proof (1kV for 60s)
Solderability
ΔR%
ΔR%
ΔR%
ΔR%
ΔR%
5
Zero at 275ºC (see graph)
5 +0.05Ω
5 +0.05Ω
2 +0.05Ω
1 +0.05Ω
No flashover, mechanical damage, arcing or breakdown
Min. 95% coverage
Derating Curve
350
Proportion of Rated Power (%)
100
80
15W-50W
Temperature
Rise
Body Temperature
Rise
50W
300
Temperature Rise (°C)
10W
250
200
150
100
50
0
10W
15W
20W
30W
40W
60
40
20
0
0
50
100
150
200
250
300
Am bient Tem perature (°C)
0
10
20
30
40
50
Pow er (W)
Am bient Tem perature (°C)
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
06.18
Wirewound Power
Radial Terminal Resistor
WPRT Series
Pulse Performance
The pulse energy capacity limits in the graph below relate to pulses below 100ms duration based on an instantaneous wire temperature
rise of 750ºC.
WPRT Series Energy Capability Graph
40&50W
30W
15W
20W
10W
Resistance value (ohms)
Application Notes
S, SR and SB configurations have terminals which can be soldered. However, for full power operation, due to the possibility of high terminal
temperatures, it is recommended that the connections be secured mechanically, rather than relying on the solder joint alone.
AT and AD configurations are designed for use in molded housing assemblies, where the alignment of terminals and the body dimensions
must be defined to a greater tolerance.
SR and AR configurations have a bracket with two fixing points rather than one, and are ideal for high shock & vibration applications.
Ordering Procedure
Type
Power Rating
Configuration
S
SB
SR
A
AB
AR
AT
AD
Soldered tag without bracket
Soldered tag with bracket
Soldered tag with rugged bracket
Example: WPRT50 at 1.2 kilohms 5% tolerance with quick connect “amp” tag terminals and bracket, bulk packed in a box of 168 pieces –
WPRT 50 AB – 1K2 J
B168
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Quick connect “amp” tag without bracket
Quick connect “amp” tag with bracket
Quick connect “amp” tag with rugged bracket
Configuration A with tighter tolerance terminal alignment
Configuration AB with tighter tolerance terminal alignment
Value (use IEC62 code)
Tolerance (use IEC62 code)
J
Packing
B440
B330
B400
B300
B270
B270
B240
B168
B160
WPRT30 / 40 / 50
Bulk
WPRT10
WPRT15
WPRT20
S / SB / A / AB / AT / AD
SR / AR
S / SB / A / AB / AT / AD
SR / AR
S / SB / A / AB / AT / AD
SR / AR
S / A / AT
SB / AB / AD
SR / AR
440 / box
330 / box
400 / box
300 / box
270 / box
270 / box
240 / box
168 / box
160 / box
Standard
5%
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
06.18
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