Square D Harmony XB4 Key Switch Head, Key No. 455, 3-Position Maintained, Right-Key Withdrawal

Square D Harmony XB4 Key Switch Head — 3-Position Maintained

The Square D Harmony XB4 ZB4BG09 is a key switch head for 22mm panel-mount operators. With a 3-position maintained action and right-key withdrawal, this switch head requires a key (No. 455) to operate and returns key withdrawal only from the right position, providing access control and operational security for industrial control panels.

Key Features

• 3-position maintained key switch operation
• Right-key withdrawal — key can only be removed in the right position
• Key number 455
• 22mm panel mount compatible (Harmony XB4 series)

Specifications

• Series: Harmony XB4
• Positions: 3
• Action: Maintained
• Key Withdrawal: Right position only
• Key Number: 455
• Model: ZB4BG09
• UPC: 78590137451
• Manufacturer: Square D (Schneider Electric)

Applications

Key switch heads are used in industrial control panels, machine tool controls, and process equipment to restrict operation to authorized personnel. The 3-position maintained design with right-key withdrawal is commonly used for mode selection functions where it is important to prevent unauthorized position changes. Compatible with Harmony XB4 series contact blocks and legend plates.