RH050270R0FE02 Datasheet, PDF (3/5 Pages) Vishay Siliconix – Wirewound Resistors, Industrial Power, Aluminum Housed, Chassis Mount

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RH, NH
Vishay Dale
POWER RATING
Vishay RH resistor wattage ratings are based on mounting to the following heat sink:
RH005 and RH010: 4" x 6" x 2" x 0.040" thick aluminum chassis (129 sq. in. surface area)
RH025:
5" x 7" x 2" x 0.040" thick aluminum chassis (167 sq. in. surface area)
RH050:
12" x 12" x 0.059" thick aluminum panel (291 sq. in. surface area)
RH100 and RH250: 12" x 12" x 0.125" thick aluminum panel (294 sq. in. surface area)
FREE AIR POWER RATING
GLOBAL
MODEL
RH005
NH005
W at 25 °C
4.5
RH010
NH010
7.5
RH025
NH025
12.5
RH050
NH050
20
RH100
NH100
40
RH250
NH250
100
AMBIENT TEMPERATURE DERATING
Derating is required for ambient temperatures above 25 °C, see the following graph.
Curves A, B, C apply to operation of unmounted resistors. Curve D applies to all types when mounted to specified heat sink.
A = RH005 and RH010 size resistor, unmounted
B = RH025 size resistor, unmounted
C = RH050, RH100 and RH250 size resistor, unmounted
D = All types mounted to recommended aluminum heat sink
120
100
80
D
60
A
B
40
C
20
0
- 55 - 50
0
50
25
150
250
AMBIENT TEMPERATURE IN °C
REDUCED HEAT SINK DERATING
Derating is also required when recommended heat sink area is reduced.
A = RH005 and RH010 size resistor
B = RH025 size resistor
C = RH050, RH100 and RH250 size resistor
100
90
80
70
60
50
40
30
20
10
0
0
A
B
C
20
40
60
80
100
% OF RECOMMENDED HEAT SINK AREA
Revision: 22-Jun-12
3
Document Number: 30201
For technical questions, contact: [e-mail]
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ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000