Siemens Emergency stop mushroom p/button, red, 1NO+1NC, 22mm Part number 3SU1100-1HB20-1FG0

Product Overview

The Siemens 3SU1100-1HB20-1FG0 is an emergency-stop (E-Stop) mushroom pushbutton from the SIRIUS ACT 3SU1 series. It features a 40 mm red round actuating head and is designed for panel mounting via a 22 mm cutout. The button provides a reliable, positively-latching STOP/E-OFF function, ensuring safe and fail-safe shutdown of machinery or installations in emergency situations.

Key Features

• Emergency-stop mushroom pushbutton, SIRIUS ACT 3SU1 series
• Actuator: 40 mm diameter, red, round
• Positive-latching mechanism — remains locked until manually released (rotate-to-unlatch)
• Single command point (1 pushbutton)
• Built-in contacts: 1 NC + 1 NC contact module for redundant safety switching
• Plastic housing suitable for industrial control panels
• Wide environmental protection: IP66 / IP67 / IP69K when properly installed — dust-tight, wash-down and high-pressure-jet resistant
• Screw-terminal connections for wiring — robust and easy to connect
• Rated insulation voltage 500 V, pollution degree 3 — suitable for industrial control circuits

Technical Specifications

• Article Number: 3SU1100-1HB20-1FG0
• Product Type: E-Stop mushroom pushbutton, SIRIUS ACT 3SU1
• Actuator Diameter: 40 mm
• Mounting Cut-out Diameter: 22.3 mm (typical tolerance +0.4 mm)
• Contacts: 2 × NC (normally closed) for safety circuits
• Switching Mechanism: Positive-latching, rotate-to-unlatch reset
• Insulation Voltage Rating: 500 V
• Protection Rating (enclosure): IP66 / IP67 / IP69K (when correctly mounted), terminal side IP20
• Contact Terminal Connection: Screw-type terminals, conductor cross-section suitable for small signal/control wiring
• Operating Ambient Temperature: –25 °C to +70 °C
• Mechanical / Environmental Robustness: Shock and vibration resistant per industrial standards (shock test 15 g / 11 ms; vibration 10–500 Hz @ 5 g)
• Compliance: Meets emergency-stop requirements per EN ISO 13850 (as part of SIRIUS ACT emergency-stop devices)

Applications

This pushbutton is ideal for use as an emergency-stop or safety shutdown switch on control panels, machine enclosures, automation cabinets, and safety circuits. It is suited for industrial environments — including those subject to dust, moisture, wash-downs or mechanical stress — thanks to its high ingress protection rating. Typical applications include machine safety interlocks, motor shutdowns, safety-guard circuits, emergency shutdowns in manufacturing, processing plants, and heavy-duty automation systems.