POWER SOLUTION – NIKKOHM
20W, 50W Metal Clad Wire Wound Power Resistors
RH25, RH25N, RH50, RH50N
Features
Inductive (RH), non-inductive (RHN) aluminum clad housed wire wound power resistors.
Molded resistor construction, ceramic winding core using and fully welded design give complete
environmental protection and long life stability.
Metal resistive wire shows performance of rush current durability.
Precision up to 30ppm/C, 0.1% performances are realized.
Low resistance of 0.022ohm is suitable for many current shunt applications.
Applications
Braking resistor and dumping resistor of the motor control, rush current protection of charging capacitors,
gate resistor of IGBT, snubber resistor and current detection of industrial power sources
Dimensions (mm)
dia. J
Symbol
A
B
C
D
E
F
G
H
J
B
G
E
C
F
A
D
H
RH25,
RH50,
RH25N
RH50N
27.1+0.15-0.1 49.3+0.15-0.1
15.6+/-0.2
15.6+/-0.2
16.0+/-0.2
16.0+/-0.2
49.4+/-0.2
70.8+/-0.2
29.6+/-0.2
29.6+/-0.2
18.3+/-0.2
39.7+/-0.2
20.6+/-0.2
20.6+/-0.2
8
8
3.2 dia.-4slot 3.2 dia.-4slot
35.0gr
Weight
16.5gr
Terminal dia.= 2.0mm.
End hole dia = 2mm in 3.7 width.
Specifications
Type
RH25
RH25N
RH50
RH50N
Winding
Inductive
Non-inductive
Inductive
Non-inductive
Power Rating
heat
Free
sink
air
(W)
(W)
20
8
20
8
50
10
50
10
Resistance
Range
(ohm)
0.022-25k
0.1-10k
0.048-50k
0.2-20k
+/-200
ppm/C
(H)
0.022-0.09
0.022-0.09
0.048-0.09
0.048-0.09
TC
+/-100
ppm/C
(A)
0.1-0.976
0.01-0.976
0.01-0.976
0.01-0.976
+/-50
ppm/C
(C)
1-19.6
1-19.6
1-19.6
1-19.6
+/-30
ppm/C
(E)
20-
20-
20-
20-
Tolerance
(symbol)-minimum
ohm
+/-0.1%(B)-1ohm
+/-0.25% (C)-0.4ohm
+/-0.5%(D)-0.2ohm
+/-1%(F)-0.1ohm
+/-2%(G)-0.05ohm
+/-5%(J)-0.02ohm
POWER SOLUTION – NIKKOHM
20W, 50W Metal Clad Wire Wound Power Resistors
RH25, RH25N, RH50, RH50N
Ordering Information
Ordering P/N
RH25-A0.2ohmD000
RH25NC19.6ohmB000
RH50NC50kohmC000
RH50-A3.3ohmJ000
RH50NH0.05ohmJ
Type
RH25
RH25
RH50
RH50
RH50
Inductive /
Non-inductive
-
N
N
-
N
TC
A
C
C
A
H
Resistance
0.2ohm
19.6ohm
50kohm
3.3ohm
0.05ohm
Tolerance
D
B
C
J
J
Additional
Code
000
000
000
000
000
Specifications
Short time overload
Heat shock
Dielectric strength
Insulation resistance
Load life
Operating temp. range
Storage temp. range
Specifications
+/-(0.2%+0.05ohm)
+/-(0.2%+0.05ohm)
+/-(0.2%+0.05ohm)
10Gohm
+/-(1.0%+0.05ohm)
-55 to +250C
-55 to+250C
Test Conditions
5 times of rating power, 5 seconds
AC2000V, at maximum leakage current=2mA.
Dry condition.
Rating power 90 min ON, 30min OFF, 1000h.
Temperature Rise
Temperature (C )
140
120
100
80
60
40
20
0
0
20
40
60
80
% of Power Rating
Free Air
RH25
RH50
Temperature Rise
100
With Heat Sink, RH25
Temperature (C )
RH50
140
120
100
80
60
40
20
0
0
20
40
60
80
100
% of Power Rating
Derating Curve
100
80
60
40
20
0
-50
0
25C
Free air (RH50)
Free air (RH25)
On Chassis (RH25/RH50)
Frequency Characteristics
Impedance (ohm)
100k
10k
RH50-A1kohmF
RH50NA1kohmF
250
1k
100k
1M
10M
50 100
150
200
Ambient Temperature (C)
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