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