The Schneider Electric XB4BA21 is a complete flush push-button from the Harmony XB4 range, suited for 22 mm panel mounting in industrial control and signalling applications. It delivers a spring-return action with one normally open contact and is supplied unmarked for custom labelling.

• Reference: XB4BA21
• Range: Harmony XB4
• Product type: Complete push-button
• Style: Flush (recessed)
• Colour: Black
• Mounting diameter: 22 mm
• Contact configuration: 1 NO (normally open)
• Action: Spring return
• Legend: Unmarked
• Cap material: Chrome-plated metal
• Base material: Zamak (zinc alloy)