Harmony® XB5/ZB5 Plastic Control & Signaling Units Schneider Electric Harmony® XB5/ZB5 Plastic Control and Signaling Units include pushbuttons, switches, timers, and pilot lights. These devices combine the simplicity of installation, flexibility, and robustness to meet most industrial applications. The XB5/ZB5 switches deliver one of the most comprehensive product ranges available on the market. These devices meet the robustness and performance requirements for the majority of industrial applications. The switches deliver an innovative and ergonomic design that allows easy operation and improves the look and feel of control panels and machines. These devices feature a comprehensive range of modular products that enable simple selection and ease of use to make an operator’s work simpler and more efficient. Typical applications include machine manufacturers, chemical industry, paper mills, marine applications, and car washes.