TM
WIRE WOUND RESISTORS
CERAMIC ENCASED TYPE
Flame Proof
High Temperature
Ceramic Housing
Inorganic
Fire Retardant
Encapsulant
Tin Plated
Copperweld
®
SERIES
POWER TYPE
Ceramic Encased Wire Wound Resistors
Fire Proof
HCW
All Welded Cap &
Lead Assembly
Alloy Wire wound
Element On
Ceramic Substrate
Very high degree of insulation
Low temperature on PCB solder joint
2 W to 20 W
R10 to 56K
PHYSICAL CONFIGURATION
HCW SERIES
d
H
35+3
L
35+3
W
HTR
TYPE
POWER
RATING
at 70°C
DIMENSIONS (mm)
L
+1.5
W
+1
H
+1
RESISTANCE TYPICAL
RANGE
WT.
min
max PER PC
d
(gms)
+0.05
PULSE TYPE RESISTORS
Resistors for use under pulse
conditions as per IEC - 61000 - 4 - 5
available. For further information
please refer to
“Understanding
pulse & over load capability of
wire wound resistors”.
In case a tailor-made pulse
resistor is required, please refer
to
"Questionnaire of data
required"
and provide data
accordingly.
CW-2
2W
3W
CW-3
CW-5
5W
CW-7
7W
CW-10
10W
CW-15 15W at 25°C
CW-20 20W at 25°C
17.5 7.5
22.0 8.0
22.0 9.5
35.0 9.5
48.0 9.5
48.0 12.5
63.0 12.5
7.0
8.0
9.5
9.5
9.5
12.5
12.5
0.8
0.8
0.8
0.8
0.8
1.0
1.0
R10
R10
R10
R10
R10
R10
R10
7K5
11K
11K
30K
43K
43K
56K
2.9
4.4
5.5
8.5
11.5
19.8
24.0
TM
WIRE WOUND RESISTORS
CERAMIC ENCASED TYPE
HCW
ELECTRICAL AND ENVIRONMENTAL CHARACTERISTICS / DATA
Test
Resistance tolerance
Voltage rating
Temperature co-efficient
Short time overload
Insulation resistance
Moisture resistance
Load life test
Derating
Performance Requirements
+ 10% [K]; + 5% [J]; +3%[H]; + 2% [G];
+1% [F]
E = PxR
+30 to +90 ppm/ °C [Depending on
resistance value]
DR = +[2% + R05]
>1000 Mega - Dry
>100 Mega - Wet
∆
R = +[5% + R05]
∆
R = +[5% + R05]
Full power dissipation at 70°C to
zero at 270°C (ambient)
DERATING CURVE
70°C
Rated Power [%]
120
100
80
40
0
40
80
120
160
200
240 275
Ambient Temperature [°C]
ORDERING INFORMATION
HCW
CW-7
10K
K
TOLERANCE
RESISTANCE VALUE
HTR TYPE
SERIES
Note :
Due to recent technological advances, the ceramic cases used may be steatite ceramic or corderite
ceramic or high alumina ceramic depending on the nature of the application. Hence the ceramic cases
may be off-white or variations of brown and variations of grey; colours which are inherent to these
ceramic materials.
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