Switch Selection Guide Summary

Overview

This document provides a detailed guide for selecting switches based on their electrical ratings and physical sizes. It categorizes switches by their power ratings, voltage capacities, and form factors to assist in choosing the appropriate switch for specific applications.

Key Specifications

• Power Ratings: Switches are rated primarily by VA (volt-ampere) at 28V AC/DC for ultra-miniature and subminiature types, and by amperage at 125V or 250V AC for miniature and standard types.
• Voltage Ratings: Common voltage ratings include 28V AC/DC for low power switches, 125V AC for medium power, and up to 250V AC for higher power switches.
• Current Ratings: Range from 0.4VA (very low current) up to 50A for high capacity standard switches.

Switch Categories and Ratings

Additional Notes

• Some standard switches are categorized by capacitance levels: Low Cap, Medium Cap, Medium/High Cap, and High Cap, indicating their suitability for different electrical loads.
• Wire lead options are available for certain switch types, facilitating easier wiring and installation.

Recommendations

When selecting a switch, consider the required current and voltage ratings first, then match the physical size and form factor to the application constraints. For low power signal switching, ultra-miniature or subminiature switches are appropriate. For higher power or industrial applications, standard switches with higher amperage ratings should be selected.