Rev Date: 01/17/2012 1 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
SWT/EWT Series
Non-Flammable Edgewound Tubular Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Features:
• High current capability
• RoHS compliant / lead-free
• Non-inductive style only available with silicone coating
(NSWT)
• Suitable for soldering or thru bolt connections
• Wirewound ribbon on ceramic substrate
• SWT – Silicone coating provides temperature handling up
to 350ºC
• SWTA – Adjustable version
• EWT – Vitreous enamel coating provides temperature
handling up to 500ºC
Dielectric
Type / Code Strength
VAC
SWT12 / EWT12 12W 1,000 0.1 - 51K 0.1 - 53 0.1 - 5K
SWT25 / EWT25 25W 2,500 1 - 30K 0.1 - 100 0.1 - 10K
SWT50 / EWT50 50W 2,500 0.1 - 50K 0.1 - 275 0.1 - 20K
SWT100 / EWT100 100W 2,500 0.1 - 100K 0.12 - 680 0.1 - 50K
SWT150 / EWT150 150W 2,500 0.1 - 150K 0.22 - 1.5K 0.1 - 80K
SWT175 / EWT175 175W 2,500 0.15 - 100K 0.24 - 1.3K 0.1 - 100K
SWT200 / EWT200 200W 2,500 0.1 - 200K 0.25 - 1.35K 0.1 - 120K
SWT225 / EWT225 225W 2,500 0.2 - 130K 0.3 - 1.7K 0.12 - 130K
SWT250 / EWT250 250W 2,500 0.5 - 125K 0.33 - 1.8K 0.5 - 200K
SWT300 / EWT300 300W 2,500 0.5 - 150K 0.42 - 2.25K 0.5 - 240K
SWT400 / EWT400 400W 2,500 0.5 - 200K 0.54 - 3K 0.5 - 300K
SWT500 / EWT500 500W 2,500 0.5 - 250K 0.77 - 4.2K 0.5 - 400K
SWT700 / EWT700 700W 2,500 1 - 350K 1 - 5.3K 1 - 500K
SWT1000 / EWT1000 1000W 2,500 1 - 500K 1.4 - 7.6K 1 - 750K
SWT1300 / EWT1300 1300W 2,500 1 - 600K 2 - 10K 1 - 1M
Power Rating
(Watts) @ 70ºC SWT NSWT
Ohmic Range (Ω) and Tolerance
EWT
Electrical Specifications
350
20
80
60
40
30
Ambient Temperature (ºC)
100
25 150100 300
200 250
Percent Rated Power (%)
Power Derating Curve:
Rev Date: 01/17/2012 2 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
SWT/EWT Series
Non-Flammable Edgewound Tubular Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
0.31 ± 0.04 0.19 ± 0.04 0.47 ± 0.04 1.75 ± 0.08 inches
7.94 ± 1.00 4.76 ± 1.00 12.00 ± 1.00 44.50 ± 2.00 mm
0.56 ± 0.04 0.31 ± 0.04 0.47 ± 0.04 2.01 ± 0.08 inches
14.30 ± 1.00 7.94 ± 1.00 12.00 ± 1.00 51.00 ± 2.00 mm
0.56 ± 0.04 0.31 ± 0.04 0.75 ± 0.04 4.02 ± 0.08 inches
14.30 ± 1.00 7.94 ± 1.00 19.00 ± 1.00 102.00 ± 2.00 mm
0.75 ± 0.04 0.50 ± 0.04 0.67 ± 0.04 6.50 ± 0.08 inches
19.10 ± 1.00 12.70 ± 1.00 17.00 ± 1.00 165.00 ± 2.00 mm
1.10 ± 0.04 0.75 ± 0.04 0.67 ± 0.04 8.11 ± 0.08 inches
28.00 ± 1.00 19.10 ± 1.00 17.00 ± 1.00 206.00 ± 2.00 mm
1.13 ± 0.04 0.75 ± 0.04 0.67 ± 0.04 8.50 ± 0.08 inches
28.60 ± 1.00 19.10 ± 1.00 17.00 ± 1.00 216.00 ± 2.00 mm
1.38 ± 0.04 0.75 ± 0.04 0.67 ± 0.04 8.74 ± 0.08 inches
35.00 ± 1.00 19.10 ± 1.00 17.00 ± 1.00 222.00 ± 2.00 mm
1.13 ± 0.04 0.75 ± 0.04 0.71 ± 0.04 10.51 ± 0.08 inches
28.60 ± 1.00 19.10 ± 1.00 18.00 ± 1.00 267.00 ± 2.00 mm
1.57 ± 0.04 0.98 ± 0.04 0.79 ± 0.04 8.27 ± 0.08 inches
40.00 ± 1.00 25.00 ± 1.00 20.00 ± 1.00 210.00 ± 2.00 mm
1.57 ± 0.04 0.98 ± 0.04 0.79 ± 0.04 10.24 ± 0.08 inches
40.00 ± 1.00 25.00 ± 1.00 20.00 ± 1.00 260.00 ± 2.00 mm
1.57 ± 0.04 0.98 ± 0.04 0.79 ± 0.04 12.99 ± 0.08 inches
40.00 ± 1.00 25.00 ± 1.00 20.00 ± 1.00 330.00 ± 2.00 mm
1.97 ± 0.04 1.38 ± 0.04 0.98 ± 0.04 12.99 ± 0.08 inches
50.00 ± 1.00 35.00 ± 1.00 25.00 ± 1.00 330.00 ± 2.00 mm
1.97 ± 0.04 1.38 ± 0.04 0.98 ± 0.04 18.11 ± 0.08 inches
50.00 ± 1.00 35.00 ± 1.00 25.00 ± 1.00 460.00 ± 2.00 mm
2.36 ± 0.04 1.57 ± 0.04 1.18 ± 0.04 21.26 ± 0.08 inches
60.00 ± 1.00 40.00 ± 1.00 30.00 ± 1.00 540.00 ± 2.00 mm
2.56 ± 0.04 1.65 ± 0.04 1.18 ± 0.04 25.59 ± 0.08 inches
65.00 ± 1.00 42.00 ± 1.00 30.00 ± 1.00 650.00 ± 2.00 mm
(1) EWT and NSWT series will have the same Mechanical Specifications as SWT series
OD ID F L
SWT1300 / EWT1300
SWT175 / EWT175
SWT200 / EWT200
SWT225 / EWT225
SWT250 / EWT250
SWT700 / EWT700
SWT1000 / EWT1000
SWT500 / EWT500
SWT300 / EWT300
SWT400 / EWT400
SWT100 / EWT100
SWT150 / EWT150
Unit
SWT12 / EWT12
SWT25 / EWT25
SWT50 / EWT50
Type / Code(1)
Mechanical Specifications
Rev Date: 01/17/2012 3 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
SWT/EWT Series
Non-Flammable Edgewound Tubular Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Hardware:
• Sturdy plated steel brackets, thru-bolts, centering washers, and insulating washers
• Brackets provide elongated mounting holes for ease of mounting
1.00 0.75 0.50 0.22 0.44 inches
25.40 19.05 12.70 5.56 11.13 mm
1.00 0.75 0.50 0.22 0.44 inches
25.40 19.05 12.70 5.56 11.13 mm
1.00 0.75 0.50 0.22 0.44 inches
25.40 19.05 12.70 5.56 11.13 mm
1.00 0.75 0.50 0.22 0.44 inches
25.40 19.05 12.70 5.56 11.13 mm
1.50 0.88 1.25 0.28 0.56 inches
38.10 22.23 31.75 7.14 14.30 mm
1.50 0.88 1.25 0.28 0.56 inches
38.10 22.23 31.75 7.14 14.30 mm
1.50 0.88 1.25 0.28 0.56 inches
38.10 22.23 31.75 7.14 14.30 mm
1.50 0.88 1.25 0.28 0.56 inches
38.10 22.23 31.75 7.14 14.30 mm
1.50 0.88 1.25 0.28 0.56 inches
38.10 22.23 31.75 7.14 14.30 mm
1.50 0.88 1.25 0.28 0.56 inches
38.10 22.23 31.75 7.14 14.30 mm
1.50 0.88 1.25 0.28 0.56 inches
38.10 22.23 31.75 7.14 14.30 mm
3.00 1.50 2.50 0.41 - inches
76.20 38.10 63.50 10.3 - mm
1.50 0.88 1.25 0.28 0.56 inches
38.10 22.23 31.75 7.14 14.30 mm
3.00 1.50 2.50 0.41 - inches
76.20 38.10 63.50 10.30 - mm
3.00 1.50 2.50 0.41 - inches
76.20 38.10 63.50 10.30 - mm
1300W
E
400W
500W
700W
1000W
200W
225W
250W
300W
50W
100W
150W
175W
DU
12W
25W
Resistor Power Rating A B C nits
Mounting Brackets Mechanical Specifications
Rev Date: 01/17/2012 4 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
SWT/EWT Series
Non-Flammable Edgewound Tubular Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Metal Centering Washer Mica Insulating Washer
0.31 1.75 2.25 0.31 - - - inches
7.95 44.40 57.15 7.95 - - - mm
0.56 2.01 2.50 0.56 0.19 0.75 0.31 inches
14.30 51.00 63.50 14.22 4.83 19.05 7.95 mm
0.56 4.02 4.75 0.56 0.19 0.75 0.31 inches
14.30 102.00 120.65 14.22 4.83 19.05 7.95 mm
0.75 6.50 7.00 0.75 0.19 1.00 0.50 inches
19.10 165.00 177.80 19.05 4.83 25.40 12.70 mm
1.10 8.11 7.75 1.12 0.25 1.25 0.62 inches
28.00 206.00 196.85 28.58 6.35 31.75 15.88 mm
1.13 8.50 9.13 1.12 0.25 1.50 0.75 inches
28.60 216.00 231.78 28.58 6.35 38.10 19.05 mm
1.38 8.74 9.25 1.40 0.25 1.50 0.75 inches
35.00 222.00 234.95 35.56 6.35 38.10 19.05 mm
1.13 10.51 11.25 1.12 0.25 1.50 0.75 inches
28.60 267.00 285.75 28.58 6.35 38.10 19.05 mm
1.57 8.74 9.25 1.57 0.50 2.00 1.00 inches
40.00 222.00 234.95 39.88 12.70 50.80 25.40 mm
1.57 10.71 11.13 1.57 0.50 2.00 1.00 inches
40.00 272.00 282.58 39.88 12.70 50.80 25.40 mm
1.57 13.46 14.00 1.57 0.50 2.00 1.00 inches
40.00 342.00 355.60 39.88 12.70 50.80 25.40 mm
2.50 12.01 12.50 2.50 0.50 3.00 1.50 inches
63.50 305.00 317.50 63.50 12.70 76.20 38.10 mm
1.97 18.19 18.75 1.97 0.50 2.25 1.25 inches
50.00 462.00 476.25 50.04 12.70 57.15 31.75 mm
2.50 20.00 20.50 2.50 0.50 3.00 1.50 inches
63.50 508.00 520.70 63.50 12.70 76.20 38.10 mm
2.56 26.26 27.00 2.56 0.50 3.00 1.50 inches
65.00 667.00 685.80 65.02 12.70 76.20 38.10 mm
0.5"
0.5"
10
10
10
0.25"
0.25"
0.25"
0.25"
1000W
1300W
AB
8
0.5"
0.5"
0.5"
0.5"
0.5"
300W
400W
500W
700W
175W
200W
225W
250W
25W
50W
100W
150W
Bolt No. D Units
12W
CResistor Power Rating OD Core Length Bolt Length
Bolt and Washers Mechanical Specifications
Rev Date: 01/17/2012 5 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
SWT/EWT Series
Non-Flammable Edgewound Tubular Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
0.28 0.25 0.34 0.19 inches
7.14 6.35 8.74 4.78 mm
0.63 0.25 0.47 0.31 inches
15.88 6.35 11.91 7.95 mm
0.63 0.25 0.47 0.31 inches
15.88 6.35 11.91 7.95 mm
25W
50W
DU
12W
Resistor Power Rating A B C nits
Spring Clip Mechanical Specifications
Rev Date: 01/17/2012 6 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
SWT/EWT Series
Non-Flammable Edgewound Tubular Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
How to Order
123456789101112
EWTM50JB200R
Code Code
- 12 Quantity
M25 Each
EWT S50
L100
A150
175
200
225
250
300
400
500
700
1000
1300
SWT Silicone Coating
(std)
Adjustable
Product Series Power Tolerance Resistance ValueDescription Packaging
Code Tol
All Sizes
K 10%
Code Description Four characters
with the multiplier
used as the
decimal holder.
Size
250W
300W
0.1 ohm = R100
1 ohm = 1R00
10 Kohm = 10K0
NSWT Non-inductive
Silicone Coating
200W
225W
175W
150W
100W
50WSpring Clips
Welded Straight Leads
1300W
400W
500W
700W
1000W
Std Tab Connection
Mounting Hardware J 5%
12W
Vitreous Enamel
25W B Bulk
Legacy Part Number (before January 3, 2011):
Power Nominal
Ratin
g
Resistance Tolerance
50 200 5%
T
y
pe Description Code Description Code Tolerance Code Description
SWT Silicone Coating (std) - Std Tab Connection 12 5% B Bulk
EWT Vitreous Enamel M Mounting Hardware 25 10%
NSWT Non-Inductive Silicone Coating S Spring Clips 50
L Welded Straight Leads 100
A Adjustable 150
175
200
225
250
300
400
500
700
1000
1300
Packaging
EWT M B
SEI Type Termination
