3SU1156-6AA20-1AA0

1. Overview

The 3SU1156-6AA20-1AA0 is a complete indicator light assembly from Siemens' SIRIUS ACT 3SU1 family — the company's modular, tried-and-tested range of pushbuttons and signaling devices in round design, available in metal and plastic variants. This unit is a panel-mount LED pilot light with a 22mm round metal (shiny/high-gloss) body, smooth red lens, and an integrated 230V AC LED module (PN: 3SU1401-1BF20-1AA0), supplied complete with a metal holder. It is manufactured in Germany (EAN: 4011209966482). Catalog name flag: The Button Index catalog lists this as "22mm Red LED Indicator 24V" — this is incorrect; all authoritative sources (Siemens, DigiKey, RS, Conrad, Mouser, Farnell) confirm the rated voltage is 230V AC, not 24V. The 24V variant has a different part number (3SU1152-6AA20-1AA0).

2. User Sentiment

No forum or enthusiast community sentiment was found for this industrial component. It is a professional-grade industrial device sold through automation distributors rather than consumer channels. The snap-on, tool-free assembly concept is highlighted positively by multiple distributors — one-hand mounting with integrated anti-rotation, requiring no groove in mounting holes. Its IP69K rating (withstands high-pressure alkaline cleaning) is frequently cited as a key selling point for demanding industrial environments. Repair services (Radwell, sintronics.de, siserv.de) advertise refurbishment support, suggesting this is a long-lived stocked part on active machinery. A notable data quality issue exists across aggregator sites (DigChip, chipdig, element14/farnell TW): they describe the product as "white colour single LED indicator" — this is a database error; every authoritative source confirms the lens color is red (code AA20 in the part number system = red, as confirmed by comparison with sibling parts AA40=green, AA70=yellow on prof-elec.fr).

3. Real-World Applications

Deployed in industrial control panels, machine operator interfaces, and process automation equipment across manufacturing, industrial automation, and infrastructure sectors. Suitable for outdoor and harsh-environment installations due to IP66/IP67/IP69K protection and resistance to dust, oils, alkaline solutions, and high-pressure washing. Used in electrical distribution boards (Verteilerbau), HVAC/pump control panels (bombeo.co, Colombia), and general industrial signaling — standard for any 230V AC panel application requiring a rugged mains-voltage status indicator. Available globally (26 distributors confirmed across US, UK, DE, FR, ES, IT, JP, PH, NO, NL, AE, AU, RU, CN, CO, PE, TR, MX).

4. Technical Specifications

• Type: Complete indicator light assembly (Leuchtmelder Komplettgerät / pilot light complete unit)
• Color: Red (smooth, flat lens; shiny/high-gloss metal bezel) — confirmed RED, not white
• Rated Voltage: 230V AC (±20%, i.e., 184–276V AC operating range)
• Insulation Voltage: 320V; Surge voltage: 4kV
• Mounting Diameter: 22mm (cutout: 22.30mm); Outer diameter: 29.45mm
• Shape: Round; Lens style: Smooth/flat
• Body Material: Metal (shiny/high-gloss), plastic cap
• Connection: Screw terminal (-1AA0 suffix); Spring-clamp alternative: 3SU1156-6AA20-3AA0
• IP Rating: IP66 / IP67 / IP69K (front); IP20 (terminal side)
• NEMA: 1, 2, 3, 3R, 4, 4X, 12, 13
• Luminosity: 450–1400 mcd (450–1120 mcd per elim.ru; 900–1400 mcd per DigiKey)
• Operating Temperature: -25°C to +70°C
• Installation Depth: ~49.7mm; Mounting height: 11.8mm; Weight: 0.08kg
• Certifications: UL, CSA, CCC, EAC, CE, RoHS compliant
• Pollution Degree: 3; Shock and vibration resistant
• Included sub-components: LED module 3SU1401-1BF20-1AA0 + metal holder

5. Ordering & Compatibility

Pricing observed: USD $84.77–$88.94 (qty 1, US market); €19.24–€22.46 (EU market); ¥84.82 (CN market, -Z Y15 variant); COP $90,000 (Colombia). DigiKey lists as not normally stocked with 6-week manufacturer lead time; spot availability confirmed at Conrad (6 units), Kempston Controls, Maraindustrial, BDI Express, and others. Compatible accessories: the LED module 3SU1401-1BF20-1AA0 is the supplied light source. Related products: 3SU1156-6AA20-3AA0 (same specs, spring-clamp terminals, EAN: 4011209967328). Customization variants available with laser labeling (suffix -Z Y10, -Z Y12, -Z Y13, -Z Y15, -Z Y19). RS Components stock number: 874-2200 (UK/global). DigiKey PN: 3SU11566AA201AA0.

6. Known Issues

Widespread data aggregation error: DigChip, chipdig, and element14 Taiwan all incorrectly describe the product as "white colour" in their database entries — this is confirmed as a data import error, not a real product variant. The actual lens color is red throughout. The catalog entry for this product (Button Index ID 119) lists the voltage as "24V" in both the product name ("22mm Red LED Indicator 24V") and the subcategory ("led-24v") — this is incorrect; the 3SU1156 part number family specifically denotes 230V AC devices. No significant field failure or quality issues reported in available distributor or market content.