3SU1150-1HB20-1CH0

1. Overview

The Siemens 3SU1150-1HB20-1CH0 is a complete emergency stop pushbutton device from the SIRIUS ACT 3SU1 series — one of Siemens' flagship modular industrial control product lines. Unlike bare actuators, this "complete device" bundles the 40mm red mushroom-head actuator, a yellow backing plate labelled "NOT-HALT" (Emergency Stop), a holder, and a 1NC contact element — everything needed for panel installation in a single part number.

The unit uses a positive-latching, rotate-to-unlock mechanism compliant with EN ISO 13850 (the international safety standard for emergency stop functions). The metal housing and high-gloss front ring distinguish this 3SU1150 variant from the plastic-body 3SU1100 sibling, making it the preferred choice for demanding environments.

2. User Sentiment

Feedback across industrial suppliers and forums is consistently positive. Users highlight the snap-on, tool-free, one-handed installation concept as a major time-saver compared to older Siemens pushbutton generations. The metal construction is praised for durability and professional appearance on control panels. The modular contact-stacking approach (up to two 1-pole modules without tools) is valued for flexibility. The product's Siemens pedigree and broad certification portfolio give specifying engineers confidence in regulatory compliance. No recurring quality complaints were identified across distributor listings.

3. Real-World Applications

• Industrial machinery safety circuits requiring EN ISO 13850-compliant emergency stop functionality
• Outdoor control panels and enclosures where IP66/IP67/IP69K ingress protection is required
• Food and beverage processing equipment subjected to high-pressure washdowns (IP69K rated)
• Automation lines communicating over PROFINET, AS-Interface, or IO-Link fieldbus networks
• Heavy manufacturing and process industries where metal-body durability outperforms plastic alternatives
• Global deployments requiring multi-standard compliance across IEC, EN, and ISO frameworks

4. Technical Specifications

• Type: Complete emergency stop mushroom pushbutton (actuator + contact element + holder + backing plate)
• Series: Siemens SIRIUS ACT 3SU1
• Mushroom Head Diameter: 40 mm
• Mounting Cutout Diameter: 22 mm (22.3 mm)
• Color: Red (glossy/shiny)
• Housing Material: Metal (front ring: high-gloss metal)
• Actuator Mechanism: Positive latching, rotate-to-unlatch (twist release)
• Safety Standard: EN ISO 13850
• Contact Configuration: 1 NC (normally closed)
• Terminal Type: Screw terminal
• Rated Voltage: 500V AC / 500V DC
• Rated Current: 10 A
• IP Protection: IP20 / IP66 / IP67 / IP69K (multi-rating)
• Depth: 95 mm
• Weight (packaged): ~128 g
• Certifications/Standards: IEC 60947-1, EN 60947-1, IEC 60947-5-1, EN 60947-5-1, IEC 60721, IEC 60068-2-27, EN ISO 13850, IEC 81346-2, IEC 61508, IEC 60068-2-6
• RoHS: Compliant
• REACH: No SVHC identified
• Country of Origin: Germany
• EAN: 4011209956865

5. Ordering & Compatibility

The 3SU1150-1HB20-1CH0 is a ready-to-install complete device. Within the modular 3SU1 system, the "1HB20" designates the metal mushroom actuator (40mm, red, shiny) and "1CH0" the 1NC contact block with screw terminals. Alternative variants include:

• 3SU1100-1HB20-1CH0 — plastic-body equivalent, lower cost and IP ratings
• 3SU1150-1HB20-1CG0 — same actuator, different contact/label variant
• 3SU1150-1HB20-3PH0 — variant with different contact configuration
• Contact blocks and actuators can be purchased separately for maintenance or custom configurations. The holder is compatible with all 3SU1-series contact elements and accessory modules (max 2 stacked 1-pole modules).
• Available through authorized Siemens distributors including Newark Electronics, RS Components, Distrelec, Kempston Controls, and Automation24.
• Typical pricing: ~€45–€55 ex VAT per unit (Europe).

6. Known Issues

No significant issues reported. The 3SU1 series has been widely deployed since its introduction with no widespread field complaints identified. The metal variant (3SU1150) is considered more robust than the plastic (3SU1100), and the IP69K rating makes it suitable for the most demanding wash-down environments. Users should ensure the 22.3mm panel cutout is correctly sized to achieve rated IP protection.