Schneider Electric Harmony XB4 3-position Key Switch Head, Latching, 22mm Cutout

Featuring black handles and a range of positions, Schneider Electric offers the Harmony ZB4 series of key switch heads. Round and chrome plated metal, they are designed to be durable, simple to set up, flexible and robust. Each switch head contains an ingenious locking system which is a snap-fit head and body, the heads can be tightened with a single screw to ensure secure and simple mounting. We have a large range of Harmony ZB4 key switch heads available in our catalogue with different positions and operator type to suit your needs.

All heads require a body/fixing collar and contact bodies which are available from our catalogue of products:
Collar 331-0142
Contact bodies 331-0158

• Low-load electrical contact
• Screw clamp connection, pins for printed circuit
• Ingenious locking system
• Flexible and robust
• -40°C to 70°C operating temperature

• Conformity with IEC, UL, CSA standards
• IP67, IP66 conforming to IEC 60529, IP69 and IP69K
• NEMA 13 and NEMA 4X
• IK06 conforming to IEC 50102

Applications - Designed for industry, infrastructure and service sector use including:
• Automotive
• Control system panel builders
• Energy distribution
• Public works
• Building
• Airports

This Harmony XB4, black head with key (key no.421E) for key selector switch has 3 positions, operates with stay-put mechanism with key withdrawal on left, center and right position. This head with key provides a versatile interface for controlling your machines. It is easily installed and replaced on compatible complete key selector switch units to provide a secure manner for authorized staff to switch between process or machine operating modes. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66. It has a metal bezel, this makes it Ideal for applications requiring high impact and vibration resistance. It is designed to fit in a standard 22mm cutout, ensuring compatibility when installing in pre-existing machinery. Secure machine and system operation with a key, only available to authorized operators. Its wide range of operating temperatures from -40°C to 70°C allows versatility in usage of product.

• Latching key switch provides secure position stability
• IP66, IP67, and IP69K ratings ensure protection against moisture
• High mechanical life of 1,000,000 cycles maximises longevity
• Black operator profile promotes visibility and usability
• Key withdrawal possible in any position enhances flexibility
• Green certified to support environmental responsibility

• Used in industrial machinery for secure control
• Ideal for harsh weather conditions in outdoor settings
• Applied in control panels for enhanced operator safety
• Utilised in automotive applications requiring robust locking mechanisms

Yes, the compact design allows for installation in limited areas.

It operates effectively in temperatures ranging from -40°C to +70°C.

Yes, it withstands high-pressure conditions up to 7,000,000Pa at 55°C.

Yes, the key can be withdrawn regardless of switch position.

It uses a 421E key for locking and unlocking functions.