Siemens 3RH29111FA220MA0 Auxiliary Switch Block
Catalog Comparison: SIRIUS 3RH29111 Family
The seed part 3RH29111FA220MA0 is one of several front-mounted auxiliary switch blocks sharing base product number 3RH29111 within the Siemens SIRIUS relay series. The table below provides side-by-side screening across shared catalog fields; all candidates require the reader's own engineering qualification before use.
| Field | 3RH29111FA220MA0 | 3RH29111FB22 | 3RH29111FC30 | 3RH29111FB11 |
|---|---|---|---|---|
| Accessory Type | Auxiliary Switch | Auxiliary Switch | Auxiliary Switch | Auxiliary Switch |
| Base Product Number | 3RH29111 | 3RH29111 | 3RH29111 | 3RH29111 |
| Series | SIRIUS | SIRIUS | SIRIUS | SIRIUS |
| Encapsulation | Box | Box | Box | Box |
| For Use With/Related Products | 3RH, 3RT Series | 3RH, 3RT Series | 3RH, 3RT Series | 3RH, 3RT Series |
| Package | Box | Box | Box | Box |
| Product Status | Active | Active | Active | Active |
| RoHS | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Similarity (0–1) | — | 0.91 | 0.91 | 0.91 |
Why these parts are catalog-similar
- 3RH29111FB22: Shares the same 9-character MPN prefix and delivers 2NO+2NC contact configuration identical to the seed. The MPN edit-distance similarity of 0.69 reflects a different suffix block designation (FB22 vs FA220MA0), likely indicating a screw-clamp termination variant versus the spring-clamp (MA) variant of the seed.
- 3RH29111FC30: Same base 3RH29111 and SIRIUS series, but switches from the 2NO+2NC configuration to a 3NO arrangement. The 0.62 edit similarity score reflects the structural change in contact pole count and configuration encoding.
- 3RH29111FB11: Matches the seed on series, base product number, encapsulation, and compatibility range (3RH, 3RT). The FB11 suffix designates a reduced 1NO+1NC contact set, providing a lower-density option within the same mounting and termination platform.
These four parts occupy the same SIRIUS S00/S0 size class and share identical mechanical mounting constraints; the primary differentiator is contact arrangement. Other alternates in the catalog (3RH29111YA210MA0, 3RH29111XA220MA7, 3RH29111XA310MA0, 3RH29111XA040MA0, 3RH29111XA400MA0) follow the same pattern with varying contact configurations ranging from 2NO+1NC through 4NO and 4NC variants.
Key Parameters
| Parameter | Value |
|---|---|
| Accessory Type | Auxiliary Switch |
| Series | SIRIUS |
| Base Product Number | 3RH29111 |
| Mounting | Front |
| Contact Configuration | 2NO + 2NC |
| Termination | CU (copper) |
| Encapsulation | Box |
| For Use With | 3RH contactors, 3RT contactors |
| Package | Box |
| Product Status | Active |
| RoHS | ROHS3 Compliant |
Ordering Context
The prefix 3RH designates the Siemens auxiliary switch accessory family within SIRIUS, positioned for front-mount attachment to 3RH and 3RT devices. The suffix FA220MA0 encodes the contact arrangement (2NO+2NC) and the MA0 termination class (spring-clamp connection). Base number 3RH29111 identifies the common mounting platform shared across multiple contact configurations in this product line.
Integration Notes
- Compatible with 3RH and 3RT series devices within the SIRIUS family.
- Front-mount configuration occupies minimal panel depth when attached to the relay body.
- Box encapsulation provides dust protection for contact elements.
FAQ
What contact configuration does the 3RH29111FA220MA0 provide? The block provides 2 normally open (NO) contacts and 2 normally closed (NC) contacts in a single front-mount unit.
Can the 3RH29111FB22 replace the 3RH29111FA220MA0 in the same panel? Both parts share base product number 3RH29111 and are listed for the same 3RH and 3RT series compatibility range. They differ in termination style (screw-clamp versus spring-clamp) and in suffix encoding. Substitution requires the reader's own verification against their specific wiring and mechanical requirements.
What differentiates the 3RH29111FB11 from the seed part? The FB11 variant provides a 1NO+1NC configuration versus the seed's 2NO+2NC arrangement, offering reduced contact density within the same SIRIUS S00/S0 mounting form factor.