Siemens SIRIUS 3RU21161KB0 Thermal Overload Relay
Functional ratings — 3RU21161KB0
| Spec | Value |
|---|---|
| Accessory type | Thermal Overload Relay |
| Series | SIRIUS 3RU2 |
| Base product number | 3RU2116 |
| Current range | 9–12.5 A |
| Encapsulation | Bulk |
| ROHS | ROHS3 Compliant |
| Product status | Active |
The CL10 sizing refers to S00 contactor mounting compatibility, and the bulk pack variant ships without individual retail packaging.
Similarity comparison — SIRIUS 3RU2 CL10 S00 family
The reader must qualify all listed alternates independently; numeric similarity does not imply interchangeability.
| MPN | Current range | Similarity |
|---|---|---|
| 3RU21161KB0 | 9–12.5 A | — |
| 3RU21161HB0 | 5.5–8 A | 0.9282 |
| 3RU21161JB0 | 7–10 A | 0.9282 |
| 3RU21161FB0 | 3.5–5 A | 0.9282 |
| 3RU21161EB0 | 2.8–4 A | 0.9282 |
All family members share identical form factor, series, and bulk packaging. Similarity derives from shared brand, base PN prefix, and category classification; current-range differencing is the sole distinguishing axis.
Trade-off checklist — 3RU21161KB0 and family
- Current range selection governs motor compatibility: the 9–12.5 A band suits motors whose full-load amperage falls within that window; mismatched sizing reduces thermal protection accuracy.
- Bulk packaging affects inventory handling: panel builders ordering high volumes may prefer bulk; single-unit or small-batch procurement may incur extra handling cost.
- S00 frame constrains contactor pairing: CL10 S00 relays mount directly to SIRIUS 3RT2 contactor line; mixing S0 or larger frames requires different relay series.
- ROHS3 compliance is uniform across family: no differentiation on environmental certification among listed alternates.