WRC
SERIES
• POWER TYPE WIRE WOUND CEMENT RESISTOR WITH GLASS ROD
→
WGR
• POWER TYPE WIRE WOUND CEMENT RESISTOR WITH CERAMIC ROD
→
WCR
• POWER TYPE CEMENT RESISTOR WITH METAL OXIDE FILM RESISTOR
→
WMR
■
R-TYPE
A
B
C
d
P
3.81Min
Resistance Range
Type
Power
Rating
2W
3W
5W
7W
Dimensions(mm)
E-24-J(
±
5%)
or G(
±
2%)
WCR
WRC 2R
WRC 3R
WRC 5R
WRC 7R
0.1-20
0.1-20
0.1-50
0.1-100
WMR
20-100K
20-100K
50-100K
100-100K
A
±
1.0
11
11
12.7
12.7
B
±
1.0
7.5
7.5
10
10
C
±
1.0
20.5
20.5
25.4
38.6
P
±
1.0
5.0
5.0
5.0
5.0
d
0.8
0.8
0.8
0.8
G
D
8.2
C
29.2
21.2
F
E
B
A
14
6.4
4.2
9.8
27.6
■
RT-TYPE
12.7
±
1.0
D
1.5Max
■
STICK CASE
W
×
H
×
L(mm)
Q’ty(PCS)
40
5W
9.8
×
29.2
×
580
50
Remarks
2W,3W
10
±
1.0
9
±
0.5
1.0Max.
18+1.0
-0.5
6.0min.
14Max.
■
DIMENSIONS
A
±
0.2
2RT
5.0
5.0
B
±
0.2
3.0
3.0
C
±
1
20.5
20.5
D
±
0.5
11.0
11.0
E
±
0.3
3.5
3.5
F
±
0.5
4.5
4.5
Unit: mm
G
±
0.5
7.5
7.5
5
±
0.8
C
¿
4.0
±
0.3
A
12.7
±
0.3
B
3RT
86
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before your order and/or use.
■
VOLTAGE RATING
Resistor shall have a rated DC or RMS continuous working voltage at commercial line
frequence and wave from corresponding to the power rating, as determined from the following formula
E: Rated continuous working voltage
X
R
P: Power rating
E= P
R: Nominal resistance
■
POWER RATING
Resistor shall have a power specified on table and based on continuous full-load operation at an ambient temperature
of 75
˚C
for 2W, 40
˚C
for 3W through 10W, 25
˚C
for over wattage.
For resistors operated at an ambient temp. exceeding these specified level, the load shall be derated in accordance
with Fig. 1 below.
100
2W
Rated Load(%)
75
3
50
15
25
0
•
•
5
•
7
•
10W
20W
25
40 50
75
100
150
155
200
250
275
Ambient Temperature(˚C)
■
SURFACE TEMPERATURE RISE
250
Surface Temp. Rise
200
150
100
50
0
20W
15W
10W
7W
5W
3W
2W
20
40
60
80
100
120
Rated Load(%)
■
PERFORMANCE CHARACTERISTICS
Item
Operating temp. range
Load life
Moisture load life
Dielectric Withstanding voltage
Thermal shock
Short time over load
-25˚C
~
+155˚C
Max. permissible deviation
No mechanical damage No arcing or breakdown
±
(5% + 0.05Ω)
No mechanical damage
±
(2% + 0.05Ω)
No mechanical damage
±
(5% + 0.05Ω)
No mechanical damage
±
(2% + 0.05Ω)
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before your order and/or use.
89
FIXED RESISTORS
No mechanical damage
±
(5% + 0.05
Ω)
PCB Design
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