ETI Heavy Duty Key Switches — Product Specifications Explore ETI’s exclusive Heavy Duty Key Switch Controls with Interchangeable Core Cylinder designs. Our switches offer reliable, secure key system integration for controlling lighting, HVAC, automatic doors, gates, and more. Available in multiple configurations, mounting options, and faceplate styles, each model features high-grade materials, anti-tamper security, and UL-rated components. Download individual product spec sheets to compare details and select the right key switch solution for your facility or system needs.