MODEL RS
Wirewound Resistors
Military, MIL-R-26 Qualified, Type RW
Precision Power, Silicone Coated
FEATURES
• Complete welded construction
• High-temperature silicone coating
• Meets applicable requirements of MIL-R-26
• Available in non-inductive styles (Type NS) with Aryton-Perry winding for lowest
reactive components
• Over 44 million unit-hours of testing with no catastrophic failures have proven
failure rate of less than 0.0066% per 1000 hours (at 60% confidence) with
full rated power at + 25°C. A failure is defined as ± 1% resistance change.
S TANDARD ELECTRICAL S P ECIFICATIONS
RESISTANCE RANGE(Ohms)
MIL. RANGE SHOWN IN BOLD FACE
MAXIMUM *
WORKING
VOLTAGE
DALE RATING
DALE
MODEL
MIL-R-26
TYPE
U
V
±.5%, ±1%
±3%, ±5%
WEIGHT
(Grams)
±.05% thru ±5%
±3% & ±5%
±.05%
±.1%
±.25%
U
V
RS-1/8
—
—
.125 W
.4 W
—
—
—
1 - 1k
—
—
.1 - 1.4k
.1 - 3.4k
8.5
20
—
—
.15
.21
.23
.34
—
RS-1/4
.499 - 1k
.499 - 3.4k
.499 - 4.9k
.499 - 10.4k
.499 - 2.74k
.499 - 6.85k
.1 - 47.1k
.1 - 18.74k
.1 - 24.5k
.1 - 6.49k
.1 - 32.3k
.1 - 32.3k
—
RS-1/2
—
.75 W
1.0 W
1.0 W
1.0W
—
1 - 1.3k
1 - 2.74k
—
.499 - 1.3k
.499 - 2.74k
.499 - 2.74k
.499 - 1.67k
.499 - 12.7k
.499 - 4.49k
.499 - 6.5k
.499 - 6.49k
.499 - 8.6k
.499 - 8.6k
—
.1 - 4.9k
29
—
RS-1A
—
—
.1 - 10.4k
.1 - 2.74k
.1 - 6.85k
.1 - 47.1k
.1 - 18.74k
.1 - 24.5k
.1 - 6.49k
.1 - 32.3k
.1 - 32.3k
.1 - 2.0k
52
—
RS-1A-300
RS-1M
RW70
—
—
—
—
—
1 - 1.32k
.499 - 12.7k
.499 - 4.49k
.499 - 6.5k
—
41
—
.30
2.10
.65
.70
—
RS-2
—
4.0 W
3.0W
5.5 W
—
210
95
250
—
RS-2M
—
RS-2B
—
3.0 W
3.0 W
2.5 W
2.5 W
2.5 W
5.0 W
5.0 W
5.0 W
7.0 W
10.0 W
10.0 W
10.0 W
3.75 W
—
140
—
157
—
RS-2B-300
RS-2C
RW79
—
3.25 W
3.25 W
3.25 W
6.5 W
—
.499 - 8.6k
.499 - 6.8k
—
138
138
130
360
—
157
157
150
410
—
1.6
1.6
1.6
4.2
—
RS-2C-17
RS-2C-23**
RS-5
—
RW69
—
.499 - 25.7k
—
.499 - 25.7k
.499 - 24.3k
—
.1 - 95.2k
.1 - 24.3k
—
.1 - 95.2k
.1 - 24.3k
.1 - 8.5k
RS-5-69
RS-5-70**
RS-7
RW74
RW67
—
6.5 W
9.0 W
13.0 W
—
—
320
504
858
—
365
576
978
—
4.2
4.7
9.0
—
.499 - 41.4k
.499 - 73.4k
—
.499 - 41.4k
.499 - 73.4k
.499 - 71.5k
—
.1 - 154k
.1 - 273k
.1 - 71.5k
—
.1 - 154k
.1 - 273k
.1 - 71.5k
.1 - 20k
RS-10
—
RS-10-38
RS-10-39**
RW78
RW68
13.0 W
—
765
875
9.0
* Maximum working voltage determined at .0008" [.020mm] diameter wire resistance values. ** Standard tolerance is ± 5% .1 ohm and above, ± 10% below 1 ohm.
± 3% available. Note: Shaded area indicates most popular models.
ELECTRICAL S P ECIFICATIONS
Terminal Strength: 5 pound pull test = RS-1/8 thru RS-1A
models. 10 pound pull test = all others.
Resistance Tolerance: ± .05%, ± .1%, ± .25%, ± .5%, ± 1%,
± 3%, ± 5%.
Temperature Coefficient: ± 90PPM/°C, below 1 ohm.
± 50PPM/°C, 1 ohm - 9.9 ohm. ± 20PPM/°C, 10 ohm
and above. (Consult factory for special TC requirements.)
MATERIAL S P ECIFICATIONS
Core: Ceramic, steatite or alumina, depending on physical size.
Element: Copper-nickel alloy or nickel-chrome alloy
depending on resistance value.
Dielectric Strength: 500 VAC for RS-1/8 through RS-1A
models. 1000 volts for all others.
End Caps: Stainless steel.
Insulation Resistance: 1000 Megohm minimum dry.
Coating: Special high temperature silicone.
Standard Terminals: Tinned Copperweld®.
100 Megohm minimum after moisture test.
Short Time Overload: 5 seconds at 5 times ratedpower for
3.25 watt size and smaller. 5 seconds at 10 times rated
power for 4 watt size and larger.
Weldable Leads: Weldable lead materials are available from
Dale® on a standard stocking basis and can be specified by
adding the dash number shown below to the standard part
number. Consult factory for charges on special lead materials.
Grade “A” Nickel, untinned -53 (Example: RS-1A-53).
MECHANICAL S P ECIFICATIONS
Solderability: MIL-R-26 Type - Meetsrequirements of
MIL-STD-202, Method 208. Standard RS (Non-MIL Styles) - Deviations for RS-1/8: Endcaps will be nickel-silver alloy and
60/40 electro tin plated terminals to facilitate soldering. terminals will be tinned copper.
Vishay Dale 1122 23rd Street, Columbus, NE 68601-3647 • Phone (402) 563-6506 • Fax 402-563-6418 • Internet www.vishay.com
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