50 Watt RCH50 Series
These 50W RCH50 Series resistors are designed to be mounted onto a heatsink. They can bear high short time overloads, are non inductive and are particularly suitable for high frequency operation and cut-out circuits.
Power at 25°C
50W with heatsink, 5.5W without heatsink
Resistance Tolerance
±5%
Temperature Coefficient
≤1Ω ±250ppm/°C, >1Ω ±150ppm/°C
Operating Temperature
-55°C → +125°C
Thermal Resistance
1.0°C/W
Limiting Element Voltage
1285Vac
Overload Voltage
2500Vac (Max.)
Dielectric Withstand Voltage
3.5KVac
Insulating Resistance
10000MΩ
Length
50 mm
Width
29.4 mm
Height
15 mm
Key Characteristics
Overload duration
RCH25
RCH50
BDS100
BDS250
1 sec.
375W
750W
200W
1500W
2 sec.
300W
600W
150W
1250W
5 sec.
125W
250W
125W
1000W
10 sec.
75W
150W
100W
750W
For each degree the ambient temperature is raised above 25°C, there is a reduction by 1% of the permitted overload.
The key characteristics table is only applicable to resistors suitably mounted on a heatsink with a thermal resistance of 1°C/W for 25 and 50W ratings, 0.7°C/W for 100W and 0.28°C/W for 250W ratings.
This data is only valid when thermal grease is used and the resistor is correctly tightened by mounting screws.
Tightening Torque
RCH25
RCH50
BDS100
BDS250
0.7Nm
1Nm
2Nm
2Nm
Dimensions
Sfernice series
RCH 5
RCH 10
RCH 25
RCH 50
L
16.6
19
28
50
W
9
11
14
15.5
H
16.4
20.6
27.5
29.4
P
10.2
12.7
18.3
33
F
11.3
14.3
18.3
39.7
T
12.5
15.9
19.8
21.4
S
5.3
5
7.7
8
ØD
2.4
2.4
3.2
3.2
M2
M2
M3
M3
