How to Derate a Switch based on Temperature, and load.

Switch Temperature Correction
  Current Derating Factor @ Application Ambient Temperature
  Military Commercial
Load Type 0oC to 85oC Above 85oC 0oC to 85oC Above 85oC
Resistive 75% of rated
Resistive load
60% of rated
Resistive load
75% of rated
Resistive load
60% of rated
Resistive load
Inductive /
Motor
75% of rated
Inductive load
60% of rated
Inductive load
40% of rated
Resistive load
30% of rated
Resistive load
Capacitive /
Lamp
75% of rated
Capacitive load
60% of rated
Capacitive load
25% of rated
Resistive load
20% of rated
Resistive load

Mechanical Switches are derated based on their load and the operational temperature. Determine the type of load the switch will see, and than the temperature of operation. A listing of Switch vendors; Switches Manufacturers


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Derating guidelines for other components;
Guideline for Derating Electronic Components


Engineering Key Words: Switch, Component Derating, Reliability, How-To, Sizing, Derate, Ampacity, Fusing, Insulation, Over-Heat, Rated Temp, Temperature, Guide, Guideline, Example, Overload, Design.


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Last Modified 3/20/08
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