General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print. A subsidiary of
TT electronics plc
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Fireproof high
temperature ceramic
case with stand-off
Inorganic
fireproof
encapsulant
Alloy resistance wire on
fiberglass substrate
PWR Series
• 3, 5, 7, and 10 watts
• 0.1Ω to 18KΩ range
• Radial leads for PC mount
• TC’s from 300 ppm/°C to +5500 ppm/°C
General Purpose Stand-Up
Power Wirewound Resistor
Dimensions (Inches and (mm))
IRC Type A B C D E LD
PWR-3 0.475 ±0.030
(12.0 ±0.8)
0.320 ±0.030
(8.1 ±0.8)
1.00 ±0.030
(25.4 ±0.8)
0.200 ±0.062
(5.08 ±1.6)
0.175 ±0.062
(4.44 ±1.6)
0.036 ±0.002
(0.91 ±0.05)
PWR-5 0.500 ±0.030
(12.7 ±0.8)
0.350 ±0.030
(8.8 ±0.8)
1.00 ±0.030
(25.4 ±0.8)
0.200 ±0.062
(5.08 ±1.6)
0.175 ±0.062
(4.44 ±1.6)
0.036 ±0.002
(0.91 ±0.05)
PWR-7 0.500 ±0.030
(12.7 ±0.8)
0.350 ±0.030
(8.8 ±0.8)
1.50 ±0.032
(38.1 ±0.81)
0.200 ±0.062
(5.08 ±1.6)
0.175 ±0.062
(4.44 ±1.6)
0.036 ±0.002
(0.91 ±0.05)
PWR-10 0.630 ±0.032
(16.0 ±0.81)
0.510 ±0.032
(13.2 ±0.81)
1.39 ±0.032
(35.3 ±0.81)
0.290 ±0.062
(7.4 ±1.6)
0.250 ±0.062
(6.4 ±1.6)
0.036 ±0.002
(0.91 ±0.05)
Physical Data
Specifications
- Power Rating: 3, 5, 7, and 10 watts
- Resistance Range:
3 watt: 0.1Ω to 7.5K 7 watt: 0.1Ω to 18K
5 watt: 0.1Ω to 8.5K 10 watt: 0.18Ω to 18K
- Tolerance: ±5% and ±10%
(refer to PWRG for tolerances less than 5% pg.129)
- Flameproof inorganic construction
- EIA RS-344, insulated fixed wirewound resistors
A
C
E
B
LD
D
0.080
±0.032
0.170
±0.062
Meniscus
permitted to
bottom of feet
PWR Series Issue November 2008 Sheet 1 of 2
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
General Purpose Stand-Up
Power Wirewound Resistor
Temperature Rise Chart
300
200
100
0
0 20 40 60 80 100 120
Hot Spot Temperature (°C)
Rated Power (%)
PWR - 7, 10
PWR - 3, 5
Power Derating Curve
100
80
60
40
0 50 100 150 200 250
Hot Spot Temperature (°C)
Rated Power (%)
PWR - 7, 10
20
0
85
25
PWR - 3, 5
Sample Part No.
IRC Type
PWR
Power
Resistance Range
Tolerance
J = ±5%, K = ±10%
RoHS Indicator
LF indicates RoHS compliance
Ordering Data
PWR 10 1202 K LF
PWR Series Issue November 2008 Sheet 2 of 2
