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Relay switches are categorized by their application, ranging from smart home automation to heavy-duty industrial or automotive use. When choosing a relay, ensure the matches your control signal (e.g., 5V for Arduino, 12V for cars) and the contact rating can handle the power of the device you are switching. Smart Home Relays

Commonly used for car horns, fog lights, and fuel pumps, these are built for DC electrical systems and often include mounting tabs or waterproof housings. Viair 40-Amp Relay Summit Racing& more Go to product viewer dialog for this item. buy relay switch

Built for panel mounting or DIN rail installation, these handle high voltage and current for industrial automation. Relay switches are categorized by their application, ranging

A standard component for DIY projects that switches up to 10A. Sold for $2.00 at aretronics.com or $2.50 at Goliath Automation & Robotics . Industrial Power Relays Viair 40-Amp Relay Summit Racing& more Go to