8 Channel Relay Module 24V High and Low Level Trigger Relay Module DIY Raspberry Pi 400 Kit How long do the AA

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8 Channel Relay Module 24V High and Low Level Trigger Relay Module DIY Raspberry Pi 400 Kit How long do the AA8 Channel Relay Module 24V High and Low Level Trigger Relay Module 8 Channel Relay Module 24V High and Low Level This is 8 Channel 12V Solid State Relay Module. A solid state relay (SSR) is just what it sounds like; an IC that acts like a mechanical relay. They allow you to control high voltage AC loads from lower voltage DC control circuitry. They accomplish this by using infrared light as the 'contact,' a solid state relay is really just an IR LED