What is the purpose of selecting derated switches for known continuous load current applications?

Selecting derated switches for known continuous load current applications is primarily aimed at obtaining reasonable switch efficiency and service life. This practice involves choosing switches that are rated higher than the actual load they will handle to ensure reliable operation under continuous use.

When a switch is derated, it operates below its maximum rated capacity, which mitigates overheating and potential damage that could arise from prolonged use at higher loads. This approach helps in extending the lifespan of the switch, as it minimizes wear and prevents failure due to thermal stress.

Furthermore, by ensuring that switches are not operating at their full capacity, you enhance their efficiency, resulting in lower electrical resistance and reduced energy loss. Thus, selecting derated switches is critical for maintaining operational integrity and ensuring long-term functionality in electrical systems.