NH-250 5 1% E01 Vishay, NH-250 5 1% E01 Datasheet - Page 3
![RESISTOR, WIREWOUND, 50HM, 250W, 1%](/photos/26/17/261774/4682793_sml.jpg)
NH-250 5 1% E01
Manufacturer Part Number
NH-250 5 1% E01
Description
RESISTOR, WIREWOUND, 50HM, 250W, 1%
Manufacturer
Vishay
Datasheet
1.RH00522R00FE02.pdf
(5 pages)
Specifications of NH-250 5 1% E01
Resistance Tolerance
± 1%
Power Rating
250W
Resistor Element Material
Wirewound
Resistor Case Style
Axial Lugs
No. Of Pins
2
Temperature Coefficient
± 50ppm/°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
POWER RATING
Vishay RH resistor wattage ratings are based on mounting to the following heat sink:
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
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
Document Number: 30201
Revision: 02-Mar-11
FREE AIR POWER RATING
GLOBAL
MODEL
W at 25 °C
RH005 and RH010:
RH025:
RH050:
RH100 and RH250:
NH005
RH005
3.75
4" x 6" x 2" x 0.040" thick aluminum chassis (129 sq. in. surface area)
5" x 7" x 2" x 0.040" thick aluminum chassis (167 sq. in. surface area)
12" x 12" x 0.059" thick aluminum panel (291 sq. in. surface area)
12" x 12" x 0.125" thick aluminum panel (294 sq. in. surface area)
120
100
100
80
60
40
20
90
80
70
60
50
40
30
20
10
- 55 - 50
0
0
0
For technical questions, contact:
Wirewound Resistors, Industrial Power,
C
A
B
Aluminum Housed, Chassis Mount
RH010
NH010
A
6.25
B
0
C
20
25
50
40
RH025
NH025
12.5
% OF RECOMMENDED HEAT SINK AREA
ww2bresistors@vishay.com
D
AMBIENT TEMPERATURE IN °C
60
150
RH050
NH050
20
80
250
100
RH100
NH100
40
Vishay Dale
www.vishay.com
RH, NH
RH250
NH250
100
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