Siemens 3SU11020AB503BA0 Illuminated Pushbutton
Overview
The 3SU11020AB503BA0 is an illuminated pushbutton operator from Siemens' SIRIUS ACT series, designed for front-panel mounting in industrial control and operator interface applications. The device features a blue momentary-contact actuator with an integral LED illumination module rated for 24 VAC/DC supply.
Key catalog fields for this part include SPST-NO contact behavior, IP66/IP67/IP69K environmental sealing, and cycle-life ratings of 10 million electrical and 3 million mechanical operations.
Key Parameters
| Parameter | Value |
|---|---|
| Actuator Type | Round, Button |
| Circuit | SPST-NO |
| Current Rating | 10 A (AC/DC) |
| Illumination Voltage (Nominal) | 24 VAC/DC |
| Illumination Type, Color | LED, Blue |
| Ingress Protection | IP66/IP67/IP69K |
| Electrical Life | 10,000,000 Cycles |
| Mechanical Life | 3,000,000 Cycles |
| Encapsulation | Box |
| Base Product Number | 3SU1102 |
Missing or unverified fields requiring datasheet confirmation:
- Operating voltage range for the contact block (not supplied)
- LED forward current / power dissipation (not supplied)
- Terminal type and wire size range (not supplied)
- Panel cutout / bezel dimensions (not supplied)
- Mounting depth / overall installation depth (not supplied)
- Contact material / breaking capacity under AC-12 / AC-15 or DC load categories (not supplied)
- Minimum applicable load for reliable contact operation (not supplied)
Verification required: Electrical ratings for contact switching under the intended load category (AC-15, AC-12, DC-13, or resistive) must be confirmed from the Siemens SIRIUS ACT datasheet before selection.
Integration Notes
The data source did not provide mounting type, panel cutout, bezel dimensions, or terminal details. These are essential for enclosure design and wiring layout. Siemens SIRIUS ACT pushbuttons use a standardized 22.5 mm round mounting format; however, specific acceptance of this part in a given enclosure or operator panel must be validated against the manufacturer's dimensional drawings.
Illumination requires a separate 24 VAC/DC supply to the LED circuit. The contact block operates independently. Electrical coordination between illumination and contact modules should be reviewed against the control-circuit voltage plan.
Selection and Substitution Notes
The 3SU11020AB503BA0 is specified as SPST-NO (single-pole, normally open). Substituting with a DPST or changeover contact variant changes circuit architecture; this must not be assumed equivalent. All variants listed in the alternate table share the same base product family (3SU1102) and mechanical life / IP ratings, but differ in contact arrangement and cap color.
No explicit mention of SIL / PL rating or ATEX / hazardous-area suitability appears in the supplied fields. Verify suitability for safety-related functions separately.
Similar Catalog Parts
| MPN | Circuit | Color | Encapsulation | Similarity |
|---|---|---|---|---|
| 3SU11020AB503BA0 (primary) | SPST-NO | Blue | Box | — |
| 3SU11020AB503FA0 | DPST-NO/NC | Blue | Box | 1.0 |
| 3SU11020AB501BA0 | SPST-NO | Blue | Bulk | 1.0 |
| 3SU11020AB501FA0 | DPST-NO/NC | Blue | Box | 1.0 |
| 3SU11020AB303BA0 | SPST-NO | Yellow | Box | 1.0 |
| 3SU11020AB403BA0 | SPST-NO | Green | Box | 1.0 |
| 3SU11020AB603BA0 | SPST-NO | White | Box | 1.0 |
| 3SU11020AB203CA0 | SPST-NC | Red | Box | 1.0 |
Why alternates are similar: All parts share the same base product number (3SU1102), actuator type (round button), illumination voltage (24 VAC/DC), IP rating (IP66/IP67/IP69K), and cycle-life ratings (10M electrical / 3M mechanical). Differences appear in cap color, contact arrangement (NO vs NC vs DPST), and packaging (box vs bulk). The primary part (3SU11020AB503BA0) is distinguished by its blue cap + SPST-NO + box encapsulation combination.
No judgment is made that higher similarity scores indicate better performance or interchangeability.
FAQ
Q: Does the 3SU11020AB503BA0 include a contact block, or is the contact block ordered separately?
The catalog title and spec fields list actuator type, circuit configuration, and current rating, but do not explicitly state whether a contact block is included with this part number. Siemens SIRIUS ACT typically offers operators and contact modules as separate line items. Verify the ordering description for 3SU11020AB503BA0 on the Siemens datasheet to confirm whether it ships as an assembled unit or as an operator head only.
Q: What is the switching capacity of the contact element under AC-15 or DC-13 load?
The supplied fields list a current rating of 10 A (AC/DC) and an electrical life of 10,000,000 cycles, but do not specify the utilization category (AC-12, AC-15, AC-14, DC-13, etc.) or the associated voltage limits. The Siemens SIRIUS ACT contact module datasheet provides rated operational currents and voltages per IEC 60947-5-1 categories; selection must align with the intended control-circuit load.
Q: Can the 3SU11020AB503BA0 be used in outdoor washdown environments?
The part is rated IP66/IP67/IP69K per the catalog fields. IP69K indicates resistance to high-pressure, high-temperature washdown. However, suitability for a specific environment depends on the complete assembly (including contact module, housing, and cable entries). Verify that all installed components and enclosure interfaces maintain the stated IP rating in the target application.