Schneider ZB4BS834 Harmony XB4 Emergency Stop Head 30mm Red Mushroom

The Schneider Electric ZB4BS834 is an emergency stop push-button head from the Harmony XB4 series, with a 30 mm unmarked red mushroom operator. The head uses trigger action with mechanical latching and is reset by turning the operator to release, suitable for ISO 13850 emergency stop circuits. It mounts in a standard 22.5 mm panel cut-out with a chromium-plated metal bezel.

Note: This is the operator head only. A compatible contact block (e.g. ZB4BZ102 body with 1 NC, or separate XB4 contact blocks) is required to form a complete operating assembly.

Technical specifications:

• Part number: ZB4BS834
• Manufacturer: Schneider Electric
• Series: Harmony XB4 (metal)
• Type: Head for emergency switching off push-button
• Operator: Red mushroom 30 mm, unmarked
• Action: Trigger action with mechanical latching
• Reset: Turn to release
• Bezel material: Chromium plated metal
• Mounting diameter: 22.5 mm
• IP rating: IP66, IP69, IP69K (IEC 60529)
• IK rating: IK06 (IEC 50102)
• Electrical shock protection: Class I (IEC 61140)
• Mechanical durability: 300,000 cycles
• Operating temperature: -40 to +70 °C
• Storage temperature: -40 to +70 °C
• Vibration resistance: 5 gn, 2-500 Hz (IEC 60068-2-6)
• Shock resistance: 30 gn / 18 ms and 50 gn / 11 ms (IEC 60068-2-27)
• High-pressure washer resistance: 7,000,000 Pa at 55 °C, 0.1 m
• Weight: 0.068 kg
• Standards: EN/ISO 13850, EN/IEC 60204-1, EN/IEC 60947-5-1, EN/IEC 60947-5-4, EN/IEC 60947-5-5
• Directive: Machinery Directive 2006/42/EC
• Certifications: UL listed, CSA, DNV, BV, LROS
• Enclosure type: UL Type 4X/13
• GTIN: 3389110888850

Features and benefits:

• Tamper-proof trigger action: a change of contact state is not possible by teasing or floating the operator - the safety requirement for ISO 13850 emergency stop devices
• Compliant with EN/ISO 13850 and Machinery Directive 2006/42/EC for machine safety stop circuits
• IP66/IP69/IP69K plus high-pressure washer resistance, suitable for food, beverage and washdown environments
• Chromium-plated metal bezel rated for 300,000 mechanical cycles
• Wide -40 to +70 °C operating range for cold-storage and outdoor industrial enclosures

Applications:

• Emergency stop circuits on machine tools, conveyors and industrial equipment requiring EN/ISO 13850 compliance
• Food, beverage and pharmaceutical equipment with IP69K washdown requirements
• Outdoor industrial control panels needing -40 °C cold-start capability

Related products in this family:

• ZB4BS844 - same trigger-action turn-to-release head in 40 mm red mushroom (also available on our store)
• ZB4BS864 - 60 mm version of the same head
• ZB4BT844 / ZB4BT84 / ZB4BX84 - push-pull reset variants (30 / 40 / 60 mm)
• ZB4BS934 / ZB4BS944 / ZB4BS964 - key-release variants (key No. 455)
• ZB4BZ102 - compatible body with 1 NC contact block for a complete assembly

Also known as: Schneider ZB4BS834, Harmony XB4 30 mm red mushroom emergency stop head, ZB4-BS834.