Siemens SIRIUS ACT Emergency Stop Pushbutton, Mushroom Head, Pull-to-Release, Metal Front Ring, Red, 22mm Mount, 3SU1050-1HA20-0AA0

In industrial environments, every second counts when a process must be halted immediately. The Siemens SIRIUS ACT Emergency Stop Pushbutton with mushroom head and pull-to-release mechanism provides a reliable, tamper-resistant way to shut down machinery fast. Its high-gloss metal front ring and vivid red actuator ensure it is instantly visible, even in busy control panels. This front element is part of the modular SIRIUS ACT system, allowing you to combine it with the appropriate holder and contact blocks to meet your specific application needs.

Who is it for

This emergency stop pushbutton is ideal for machine builders, panel builders, and maintenance teams in manufacturing, packaging, and process industries. It suits applications requiring a robust, high-visibility E-stop that can withstand frequent use and harsh environments.

Main features

• Mushroom-shaped actuator with 40 mm diameter for easy activation
• Pull-to-release unlocking prevents accidental reset
• High-gloss metal front ring for durability and aesthetics
• 22.3 mm mounting diameter fits standard panel cutouts
• High degree of protection: IP66, IP67, IP69K (front)
• Long mechanical life: 100,000 switching cycles
• Compliant with IEC/EN 60947-5-1 and 60947-5-5

Specifications

• Product type: Emergency stop pushbutton front element
• Series: SIRIUS ACT
• Actuator type: Mushroom pushbutton
• Actuator colour: Red
• Actuator diameter: 40 mm
• Unlocking mechanism: Pull-to-release
• Front ring material: Metal, high-gloss
• Mounting diameter: 22.3 mm
• Illumination: Non-illuminated
• Latching function: Latching (maintained)
• Degree of protection (front): IP66, IP67, IP69K
• NEMA rating (front): NEMA 1, 2, 3, 3R, 4, 4X, 12, 13
• Operating temperature: -25 to +70 °C
• Storage temperature: -40 to +80 °C
• Mechanical service life: 100,000 cycles
• Compliance: IEC 60947-5-1, EN 60947-5-1, IEC 60947-5-5, EN 60947-5-5
• RoHS compliant: Yes
• Explosion protection: No
• Required accessories: Holder and contact blocks (sold separately)

Tips

For a complete emergency stop function, pair this front element with a SIRIUS ACT holder and at least one NC contact block. Ensure the panel cutout is exactly 22.3 mm for proper sealing. The pull-to-release action meets common safety standards, but always verify compliance with your local regulations.