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 key switch head is part of the Harmony XB4 series and is intended for use in various automation and electrical applications. Featuring a cutout diameter of 22mm, this robust key switch provides three distinct positions for operation and is particularly suitable for settings requiring secure locking mechanisms. Its durable construction ensures functionality in challenging environments, with a wide operating temperature range of -40°C to +70°C.

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Yes, the key can be withdrawn regardless of switch position.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