Schneider ZB4BS844 Harmony XB4 (metal, 22mm) Emergency Stop Head 40mm trigger...

The ZB4BS844 is a Harmony XB4 series emergency stop button head from Schneider Electric, designed for 22.5 mm panel cutouts with a red 40 mm mushroom actuator and twist-to-release reset mechanism. Built with a chrome-plated metal body, it uses a push-to-latch action with mechanical hold, making it suited for safety-critical machine control applications.

Technical specifications:

• Commercial reference: ZB4BS844
• Manufacturer: Schneider Electric
• EAN:
• Series / range: Harmony XB4
• Product type: Emergency stop button head
• Mounting diameter: 22.5 mm
• Head profile: Red mushroom, 40 mm, unmarked
• Body material: Chrome-plated metal
• Action type: Push-to-latch with mechanical hold
• Reset: Twist-to-release
• Dimensions (W x H x D): 40 x 40 x 57 mm
• Weight: 0.073 kg
• Mechanical durability: 300,000 cycles
• IP protection: IP66, IP69, IP69K per IEC 60529
• NEMA rating: NEMA 4, 4X, 12, 13
• IK rating: IK06 per IEC 50102
• Operating temperature: -40...70°C
• Electrical protection class: Class I per IEC 61140
• Standards: IEC 60947-5-5, IEC 60947-5-1, IEC 60947-1, ISO 13850, IEC 60204-1, UL 508, CSA C22.2 No 14, JIS C8201-5-1, GB 14048.5
• Certifications: DNV, UL, Lloyd's Register (LROS), Bureau Veritas (BV), CSA
• Vibration resistance: 5 gn (2...500 Hz) per IEC 60068-2-6
• Shock resistance: 30 gn (18 ms) / 50 gn (11 ms) per IEC 60068-2-27

Features and benefits:

• Chrome-plated metal construction provides robust mechanical durability across 300,000 operating cycles
• Red 40 mm mushroom head offers high visibility for reliable emergency stop actuation
• Push-to-latch with mechanical hold ensures the actuator stays engaged after activation until intentionally released
• IP66, IP69, and IP69K ratings make it suitable for washdown and wet industrial environments
• Compatible with up to 4 contact blocks using front-mount single or double contact block assemblies
• Multi-certification including DNV and Lloyd's Register supports use in marine and offshore installations

Applications:

• Industrial machine control panels requiring a compliant emergency stop device
• Marine and offshore equipment requiring DNV or Lloyd's Register certified components
• Food processing or chemical plant environments requiring IP69K washdown protection
• Factory automation safety circuits designed to IEC 60204-1 and ISO 13850
• Automation enclosures in harsh environments rated to NEMA 4X

Compliant with IEC 60947-5-5, ISO 13850, IEC 60204-1, UL 508, and CSA C22.2 No 14. Part of the Schneider Electric Harmony XB4 range.

Also known as: Schneider ZB4BS844, Schneider Electric ZB4BS844, Harmony XB4 emergency stop head, 22mm mushroom head emergency stop actuator.