Eaton XTCE400M22A – Push Button Contact Block / Module The Eaton XTCE400M22A is a NO (Normally Open) contact block module from the XTCE series, designed for use with Eaton's modular industrial control components. It functions as an electrical switching element that is mechanically actuated by an external operator (such as a pushbutton, selector switch, or key switch) but does not include the operator itself. This module mounts onto the back of a compatible operator, creating a complete control station when combined.