3SU1150-0AB40-1BA0

1. Overview

The Siemens 3SU1150-0AB40-1BA0 is a non-illuminated, momentary complete-unit pushbutton from the SIRIUS ACT 3SU1 family — Siemens's modular, tried-and-tested range of pushbuttons and indicator lights in 22mm round format. The part number decodes as: 3SU1150 = metal (shiny/high-gloss) actuator complete unit; 0AB40 = non-illuminated flat pushbutton, green; 1BA0 = 1NO contact, screw terminal. The unit ships as a complete assembly including the green flat actuating button, metal holder, and a pre-fitted 1NO contact module, making it ready for panel installation straight from the box. It is manufactured in Germany (EAN 4011209958319, UPC 804766071997, HS Code 85365080).

DATA QUALITY FLAG: The catalog entry for product ID 257 names this part "SIRIUS ACT Green Complete Button Plastic 1NO" — this is incorrect. The 3SU1150 series is the METAL (shiny) line; the plastic line is 3SU1050. Every authoritative source (Siemens datasheets, RS, DigiKey, Farnell, Newark, Mouser, Radwell, and 15+ regional distributors) consistently describes this part as metal, shiny/high-gloss front ring with metal holder. The catalog subcategory "flush-momentary" is correct. Color (green) and contact (1NO) are also confirmed correct.

2. User Sentiment

No dedicated forum reviews or head-to-head user comparisons were found in the findings. However, the product carries strong implicit credibility markers: it has been listed on Amazon since April 2018 (ASIN B07CJZWPQ7) with a dedicated customer reviews page, and is distributed through Siemens's full authorized network (DigiKey, Mouser, RS, Farnell, Newark, Radwell, Conrad). Industrial users value the SIRIUS ACT line's IP69K washdown protection and the patented one-hand mounting system. One Amazon listing subtitle highlights "5 to 500 volts, Protection" as a customer-facing selling point. No known quality complaints or field failure patterns emerged from the available sources.

3. Real-World Applications

The 3SU1150-0AB40-1BA0 is used in industrial control panels for machine start/stop operations, safety interlocks, and process activation across all industrial sectors. German distributor WLW lists specific uses as: machine and plant control (Steuerung von Maschinen und Anlagen), control panel operation (Bedienung von Steuerpulten), and safety function activation (Aktivierung von Sicherheitsfunktionen). The IP66/IP67/IP69K and NEMA 1/2/3/3R/4/4X/12/13 ratings make it suitable for food and beverage processing (washdown environments), heavy industry, chemical plants, and outdoor enclosures. Its worldwide product approvals (IEC 60947-5-1, CE) make it usable globally without re-certification.

4. Technical Specifications

• Type: Non-illuminated flush (flat) pushbutton, complete unit (actuator + holder + 1NO contact module)
• Series: SIRIUS ACT 3SU1, metal shiny (high-gloss), 22mm
• Color: Green (actuating element plastic cap, green; front ring metal, silver high-gloss)
• Contact: 1NO (SPST-NO), momentary/spring-return
• Terminal: Screw terminal (1BA0 suffix); spring-type terminal available as 3BA0 variant
• Mounting diameter: 22mm (22.30mm nominal), round cutout
• Voltage rating: 500V AC/DC; insulation voltage 500V; overvoltage resistance 6 kV
• Current rating: 10A AC/DC
• IP rating: IP66, IP67, IP69K (terminal: IP20)
• NEMA: 1, 2, 3, 3R, 4, 4X, 12, 13
• Pollution degree: 3
• Operating temperature: -25°C to +70°C
• Mechanical/electrical life: 10,000,000 cycles
• Actuator outer diameter: 29.45 mm
• Overall dimensions: approx. 30 × 60.7 × 40 mm
• Standards: IEC 60947-5-1, RoHS compliant
• Country of origin: Germany

5. Ordering & Compatibility

Pricing at DigiKey is $54.91 (single unit) to $38.47 at 250+ quantity, with a manufacturer standard lead time of 7 weeks (as of 2026). The part is available through RS Components (stock 874-2131 / 70622696 US), Farnell/Newark (06AC6932), Mouser, DigiKey (3473-3SU11500AB401BA0-ND), Radwell, and Conrad. A 20-unit pack variant is available as A6X30142959 (suffix -Z X90). Optional laser-labeling variants: -Z Y10 (upper case symbols), -Z Y15 (upper and lower case), -Z Y19 (spring terminal + laser label). Component breakdown for the modular system: actuator 3SU1050-0AB40-0AA0, holder 3SU1550-0AA10-0AA0, contact module 3SU1400-1AA10-1BA0. Compatible with all standard 3SU1 contact blocks and LED modules for the 22mm SIRIUS ACT family. Related non-illuminated green variants include 3SU1050-0AB40-1BA0 (plastic housing) and 3SU1150-0AB40-1FA0 (flat, metal, different contact).

6. Known Issues

One eBay listing (id 1885080) mislabels this part as an "Illuminated Pushbutton Switch" — this is incorrect; the 3SU1150-0AB40-1BA0 is explicitly non-illuminated (confirmed by RS Morocco, Mixtronica, WESCO, and Siemens datasheets). The automation24.fr and automation24.be FR snippets contain a copy error referencing "surface de commutation noire" (black switching surface) — the correct color is green, confirmed by all other sources. The primary data quality issue is the catalog's incorrect "Plastic" designation in the product name (should be "Metal"). No field reliability issues or safety bulletins were identified.