Rev Date: 03/25/2011 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 SWT NSWT EWT
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 - 250K 0.33 - 1.8K 0.5 - 200K
SWT300 / EWT300 300W 2,500 0.5 - 300K 0.42 - 2.25K 0.5 - 240K
SWT400 / EWT400 400W 2,500 0.5 - 400K 0.54 - 3K 0.5 - 300K
SWT500 / EWT500 500W 2,500 0.5 - 500K 0.77 - 4.2K 0.5 - 400K
SWT700 / EWT700 700W 2,500 1 - 600K 1 - 5.3K 1 - 500K
SWT1000 / EWT1000 1000W 2,500 1 - 1M 1.4 - 7.6K 1 - 750K
SWT1300 / EWT1300 1300W 2,500 1 - 1.3M 2 - 10K 1 - 1M
Power Rating
(Watts) @ 70ºC
Ohmic Range (Ω) and Tolerance
5% and 10%
Electrical Specifications
Rev Date: 03/25/2011 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 0.188 ± 0.04 0.47 ± 0.04 1.75 ± 0.08 inches
7.94 ± 1.0 4.76 ± 1.0 12.0 ± 1.0 44.5 ± 2.0 mm
0.56 ± 0.04 0.31 ± 0.04 0.47 ± 0.04 2.00 ± 0.08 inches
14.3 ± 1.0 7.94 ± 1.0 12.0 ± 1.0 51.0 ± 2.0 mm
0.56 ± 0.04 0.31 ± 0.04 0.75 ± 0.04 4.00 ± 0.08 inches
14.3 ± 1.0 7.94 ± 1.0 19.0 ± 1.0 102.0 ± 2.0 mm
0.75 ± 0.04 0.5 ± 0.04 0.67 ± 0.04 6.5 ± 0.08 inches
19.1 ± 1.0 12.7 ± 1.0 17.0 ± 1.0 165.0 ± 2.0 mm
1.1 ± 0.04 0.75 ± 0.04 0.67 ± 0.04 7.11 ± 0.08 inches
28.0 ± 1.0 19.1 ± 1.0 17.0 ± 1.0 206.0 ± 2.0 mm
1.13 ± 0.04 0.75 ± 0.04 0.67 ± 0.04 8.5 ± 0.08 inches
28.6 ± 1.0 19.1 ± 1.0 17.0 ± 1.0 216.0 ± 2.0 mm
1.38 ± 0.04 0.75 ± 0.04 0.67 ± 0.04 8.74 ± 0.08 inches
35.0 ± 1.0 19.1 ± 1.0 17.0 ± 1.0 222.0 ± 2.0 mm
1.125 ± 0.04 0.75 ± 0.04 0.71 ± 0.04 10.5 ± 0.08 inches
28.6 ± 1.0 19.1 ± 1.0 18.0 ± 1.0 267.0 ± 2.0 mm
1.57 ± 0.04 1.125 ± 0.04 0.71 ± 0.04 8.74 ± 0.08 inches
40 ± 1.0 28.6 ± 1.0 18.0 ± 1.0 222.0 ± 2.0 mm
1.57 ± 0.04 1.125 ± 0.04 0.71 ± 0.04 10.71 ± 0.08 inches
40 ± 1.0 28.6 ± 1.0 18.0 ± 1.0 272.0 ± 2.0 mm
1.57 ± 0.04 1.125 ± 0.04 0.71 ± 0.04 13.46 ± 0.08 inches
40.0 ± 1.0 28.6 ± 1.0 18.0 ± 1.0 342.0 ± 2.0 mm
2.5 ± 0.04 1.75 ± 0.04 1.1 ± 0.04 12 ± 0.08 inches
63.5 ± 1.0 44.5 ± 1.0 28.0 ± 1.0 305.0 ± 2.0 mm
1.97 ± 0.04 1.41 ± 0.04 1.1 ± 0.04 18.18 ± 0.08 inches
50.0 ± 1.0 35.7 ± 1.0 28.0 ± 1.0 462.0 ± 2.0 mm
2.50 ± 0.04 1.75 ± 0.04 1.18 ± 0.04 20 ± 0.08 inches
63.5 ± 1.0 44.5 ± 1.0 30.0 ± 1.0 508.0 ± 2.0 mm
2.56 ± 0.04 1.75 ± 0.04 1.18 ± 0.04 26.26 ± 0.08 inches
65.0 ± 1.0 44.5 ± 1.0 30.0 ± 1.0 667.0 ± 2.0 mm
(1) EWT and NSWT series will have the sa
SWT1300 / EWT1300
SWT175 / EWT175
SWT200 / EWT200
SWT225 / EWT225
SWT250 / EWT250
SWT700 / EWT700
SWT1000 / EWT1000
SWT100 / EWT100
SWT150 / EWT150
SWT300 / EWT300
SWT400 / EWT400
Type / Code(1) Unit
SWT12 / EWT12
SWT500 / EWT500
ID F LOD
SWT25 / EWT25
SWT50 / EWT50
Mechanical Specifications
me Mechanical Specifications as SWT series
350
20
30
80
60
40
Ambient Temperature (ºC)
100
25 150100 300
200 250
Percent Rated Power (%)
Power Derating Curve:
Rev Date: 03/25/2011 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
123456789101112
EWTM50JB200R
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
SEI Type Termination Packaging
EWT M B
Code Code
T- 12 Quantity
TM25 each
S50
L100
A150
175
200
225
250
300
400
500
700
1000
1300
Std Tab Connection
Mounting Hardware J 5%
1300W
400W
500W
700W
1000W
WT Non-inductive Silicone
Coating
200W
225W
175W
150W
100W
50WSpring Clips
Welded Straight Leads
Vitreous Enamel 25W
250W
300W
Bbulk
1 ohm = 1R00
10 Kohm = 10K0
0.1 ohm = R100
SizeCode Tol
all sizes Four characters with the
multiplier used as the
decimal holder.
K10%
Code Description
Adjustable
Product Series Power Tolerance Resistance ValueDescription Packaging
Silicone Coating (std) 12W
SW
EW
NS
How to Order
Legacy Part Number (before January 3, 2011):
