SWT/EWT Series — Non-Flammable Edgewound Tubular
Wire Wound
Features
• High current capability
• RoHS compliant / Lead-free
• Suitable for soldering or thru bolt connections
• Wirewound Ribbon on ceramic substrate
• Refer to appropriate mounting spec sheet for non standard tab connections
• SWT -Silicone coating provides Power Derating to 350°C
• EWT -Vitreous Enamel coating provides Power Derating to 500°C
Electrical Specifications
Type / Code
Power Rating
(Watts)
@ 70°C
12W
25W
50W
100W
150W
175W
200W
225W
250W
300W
400W
500W
700W
1000W
1300W
Dielectric Strength
VAC
1,000
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
Ohmic Range and Tolerance - 5% & 10%
SWT
0.1Ω
−
51KΩ
1Ω
−
30KΩ
0.1Ω
−
50KΩ
0.1Ω
−
100KΩ
0.1Ω
−
150KΩ
0.15Ω
−
100KΩ
0.1Ω
−
200KΩ
0.2Ω
−
130KΩ
0.5Ω
−
250KΩ
0.5Ω
−
300KΩ
0.5Ω
−
400KΩ
0.5Ω
−
500KΩ
1Ω
−
600KΩ
1Ω
−
1MΩ
1Ω
−
1.3MΩ
EWT
0.1Ω
−
5KΩ
0.1Ω
−
10KΩ
0.1Ω
−
20KΩ
0.1Ω
−
50KΩ
0.1Ω
−
80KΩ
0.1Ω
−
100KΩ
0.1Ω
−
120KΩ
0.12Ω
−
130KΩ
0.5Ω
−
200KΩ
0.5Ω
−
240KΩ
0.5Ω
−
300KΩ
0.5Ω
−
400KΩ
1Ω
−
500KΩ
1Ω
−
750KΩ
1Ω
−
1MΩ
SWT 12 / EWT 12
SWT 25 / EWT 25
SWT 50 / EWT 50
SWT 100 / EWT 100
SWT 150 / EWT 150
SWT 175 / EWT 175
SWT 200 / EWT 200
SWT 225 / EWT 225
SWT 250 / EWT 250
SWT 300 / EWT 300
SWT 400 / EWT 400
SWT 500 / EWT 500
SWT 700 / EWT 700
SWT 1000 / EWT 1000
SWT 1300 / EWT 1300
How to Order
EWT
SEI Type
Type
SWT
EWT
Description
Silicone Coating (Std)
Vitreous Enamel
M
Termination
Code
-
M
S
L
50
Code
Description
Std Tab Connection
Mounting Hardware
Spring Clips
Welded Straight Leads
200
Nominal Resistance
Power Rating
12
25
50
100
150
175
200
225
250
300
400
500
700
1000
5%
Tolerance
B
Packaging
Code
B
Description
Bulk
Tolerance
5%
10%
1300
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Rev 09/08
SWT/EWT Series — Non-Flammable Edgewound Tubular
Wire Wound
.
Mechanical Specifications
Type / Code*
Tolerance
SWT 12 / EWT 12
SWT 25 / EWT 25
SWT 50 / EWT 50
SWT 100 / EWT 100
SWT 150 / EWT 150
SWT 175 / EWT 175
SWT 200 / EWT 200
SWT 225 / EWT 225
SWT 250 / EWT 250
SWT 300 / EWT 300
SWT 400 / EWT 400
SWT 500 / EWT 500
SWT 700 / EWT 700
SWT 1000 / EWT 1000
SWT 1300 / EWT 1300
OD
±
0.04
±
1.0
0.31
7.94
0.56
14.3
0.56
14.3
0.75
19.1
1.10
28.0
1.13
28.6
1.38
35.0
1.125
28.6
1.57
40.0
1.57
40.0
1.57
40.0
2.50
63.5
1.97
50.0
2.50
63.5
2.56
65.0
ID
±
0.04
±
1.0
0.188
4.76
0.31
7.94
0.31
7.94
0.50
12.7
0.75
19.1
0.75
19.1
0.75
19.1
0.75
19.1
1.125
28.6
1.125
28.6
1.125
28.6
1.75
44.5
1.41
35.7
1.75
44.5
1.75
44.5
F
±
0.04
±
1.0
0.47
12.0
0.47
12.0
0.75
19.0
0.67
17.0
0.67
17.0
0.67
17.0
0.67
17.0
0.71
18.0
0.71
18.0
0.71
18.0
0.71
18.0
1.10
28.0
1.10
28.0
1.18
30.0
1.18
30.0
L
±
0.08
±
2.0
1.75
44.4
2.00
51.0
4.00
102
6.50
165
7.11
206
8.50
216
8.74
222
10.5
267
8.74
222
10.71
272
13.46
342
12.00
305
18.18
462
20.00
508
26.26
667
Units
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
*EWT series will have the same Mechanical Specifications as SWT series
Toll Free: (888) SEI-SEIS
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email: marketing@seielect.com
Rev 09/08
SWT/EWT Series — Non-Flammable Edgewound Tubular
Wire Wound
Mounting Brackets Mechanical Specifications
Resistor Power
Rating
SWT 12 / EWT 12
SWT 25 / EWT 25
SWT 50 / EWT 50
SWT 100 / EWT 100
SWT 150 / EWT 150
SWT 175 / EWT 175
SWT 200 / EWT 200
SWT 225 / EWT 225
SWT 250 / EWT 250
SWT 300 / EWT 300
SWT 400 / EWT 400
SWT 500 / EWT 500
SWT 700 / EWT 700
SWT 1000 / EWT 1000
SWT 1300 / EWT 1300
A
1.00
25.40
1.00
25.40
1.00
25.40
1.00
25.40
1.5
38.1
1.5
38.1
1.5
38.1
1.5
38.1
1.5
38.1
1.5
38.1
1.5
38.1
3.00
76.2
1.5
38.1
3.00
76.2
3.00
76.2
B
0.750
19.05
0.750
19.05
0.750
19.05
0.750
19.05
0.875
22.23
0.875
22.23
0.875
22.23
0.875
22.23
0.875
22.23
0.875
22.23
0.875
22.23
1.50
38.10
0.875
22.23
1.50
38.10
1.50
38.10
C
0.50
12.70
0.50
12.70
0.50
12.70
0.50
12.70
1.25
31.75
1.25
31.75
1.25
31.75
1.25
31.75
1.25
31.75
1.25
31.75
1.25
31.75
2.50
63.50
1.25
31.75
2.50
63.50
2.50
63.50
D
0.219
5.56
0.219
5.56
0.219
5.56
0.219
5.56
0.281
7.14
0.281
7.14
0.281
7.14
0.281
7.14
0.281
7.14
0.281
7.14
0.281
7.14
0.406
10.30
0.281
7.14
0.406
10.30
0.406
10.30
E
0.438
11.13
0.438
11.13
0.438
11.13
0.438
11.13
0.563
14.30
0.563
14.30
0.563
14.30
0.563
14.30
0.563
14.30
0.563
14.30
0.563
14.30
Units
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
0.563
14.30
inches
mm
inches
mm
inches
mm
Toll Free: (888) SEI-SEIS
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email: marketing@seielect.com
Rev 09/08
SWT/EWT Series — Non-Flammable Edgewound Tubular
Wire Wound
Bolt and Washers Mechanical Dimensions
Resistor
Power
Rating
12W
25W
50W
100W
150W
175W
200W
225W
250W
300W
400W
500W
700W
1000W
1300W
inches
mm
B
C
D
OD
0.313
7.95
0.56
14.3
0.56
14.3
0.75
19.1
1.10
28.0
1.13
28.6
1.38
35.0
1.125
28.6
1.57
40.0
1.57
40.0
1.57
40.0
2.50
63.5
1.97
50.0
2.50
63.5
2.56
65.0
Core
Length
1.75
44.4
2.00
51.0
4.00
102
6.50
165
7.11
206
8.50
216
8.74
222
10.5
267
8.74
222
10.71
272
13.46
342
12.00
305
18.18
462
20.00
508
26.26
667
Bolt
Length
2.25
57.15
2.50
63.50
4.75
120.65
7.00
177.80
7.75
196.85
9.125
231.78
9.25
234.95
11.25
285.75
9.25
234.95
11.125
282.58
14.00
355.60
12.50
317.50
18.75
476.25
20.50
520.70
27.00
685.80
Bolt
No.
8
10
10
10
0.25"
0.25"
0.25"
0.25"
0.50"
0.50"
0.50"
0.50"
0.50"
0.50"
0.50"
A
0.313
7.95
0.56
14.22
0.56
14.22
0.75
19.05
1.125
28.575
1.125
28.575
1.400
35.56
1.125
28.575
1.57
39.878
1.57
39.878
1.57
39.878
2.50
63.50
1.97
50.04
2.50
63.50
2.56
65.02
0.190
4.83
0.190
4.83
0.190
4.83
0.250
6.35
0.250
6.35
0.250
6.35
0.250
6.35
0.500
12.70
0.500
12.70
0.500
12.70
0.500
12.70
0.500
12.70
0.500
12.70
0.500
12.70
0.75
19.05
0.75
19.05
1.00
25.40
1.25
31.75
1.50
38.10
1.50
38.10
1.50
38.10
2.00
50.80
2.00
50.80
2.00
50.80
3.00
76.20
2.25
57.15
3.00
76.20
3.00
76.20
0.313
7.95
0.313
7.95
0.500
12.7
0.625
15.875
0.75
19.05
0.75
19.05
0.75
19.05
1.00
25.40
1.00
25.40
1.00
25.40
1.50
38.1
1.25
31.75
1.50
38.1
1.50
38.1
Toll Free: (888) SEI-SEIS
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80
email: marketing@seielect.com
Rev 09/08
SWT/EWT Series — Non-Flammable Edgewound Tubular
Wire Wound
Spring Clip Mechanical Specifications
Resistor Power
Rating
12W
25W
50W
A
0.281
7.14
0.625
15.88
0.625
15.88
B
0.25
6.35
0.25
6.35
0.25
6.35
C
0.344
8.74
0.469
11.91
0.469
11.91
D
0.188
4.78
0.313
7.95
0.313
7.95
Units
inches
mm
inches
mm
inches
mm
Toll Free: (888) SEI-SEIS
(888) 734-7347
www.seielect.com
81
email: marketing@seielect.com
Rev 09/08