User Manual

RPS 250
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
Vishay Sfernice
Document Number: 50007 For technical questions, contact: [e-mail]
www.vishay.com
Revision: 24-Nov-08 33
OVERLOADS
In any case the applied voltage must be lower than 2.5 Un. U maxi < 2.5 Un < 12 500 V.
Short time overload: 4 Pn/10 s
Accidental overload: The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink.
ENERGY CURVE
POWER RATING CHART
The temperature of the heatsink should be maintained in the limit specified.
To improve the thermal conductivity, surfaces in contact should be coated with a silicone grease.
MARKING
Series, style, ohmic value (in Ω), tolerance in %, manufacturing date, VISHAY trademark
PACKAGING
Packaging box of 15 units
ENERGY IN JOULES
OVERLOAD DURATION IN SECONDS
1 µs
0.13
1
10
100
1000
10 000
10 µs 100 µs 1 ms 1 s10 ms 100 ms
% RATED POWER
0 20 40 60 80 100 120 140
HEATSINK TEMPERATURE IN DEGREES CELSIUS
0
20
40
60
80
100