The 331E10 is a contact block sub-assembly designed for BACO non-illuminated control heads, featuring screw terminal connections and a single position clip configuration. This block provides 3 normally open (NO) contacts and 1 normally closed (NC) contact, enabling flexible switching configurations for pushbutton and selector switch applications. The assembly measures 43 mm in height, 20.1 mm in depth, and 25 mm in width, conforming to standard EN IEC 60947-5-1 and RoHS compliance requirements. The contact block is constructed with corrosion-resistant materials suitable for harsh environments including chemical exposure and sea air conditions. It is commonly used in industrial control panels, emergency stop circuits, and signaling systems where reliable contact switching and modular design are essential.