Siemens 3RH1921-2CA01 Auxiliary Switch
Specified Parameters
| Specification | Value |
|---|---|
| Accessory Type | Auxiliary Switch |
| Base Product Number | 3RH1921 |
| For Use With / Related Products | 3RT1 Contactors |
| Encapsulation | Bulk |
| Package | Bulk |
| Product Status | Active |
| RoHS Compliance | ROHS3 Compliant |
| Series | SIRIUS 3RH1 |
| Stocks (total) | 5 |
Application Context
The 3RH1921-2CA01 is a front-mounted auxiliary contact block rated for the SIRIUS 3RH1 contactor family. The suffix notation indicates a late-break 1NC configuration. Compatibility is limited to 3RT1 contactor frame sizes S0 through S3. The bulk packaging reflects standard distribution quantities for this catalog line.
Comparison: 3RH1921-2CA01 vs. Alternate Front-Mount Auxiliary Switches
Readers must evaluate each part independently for their specific contactor frame and circuit requirements.
| Spec | 3RH1921-2CA01 (seed) | 3RH1921-1CA01 | 3RH1921-2CA10 | 3RH1921-2DA11 |
|---|---|---|---|---|
| Contact Configuration | 1NC | 1NC | 1NO | 1NO + 1NC |
| Mount Position | Front | Front | Front | Front (cage clamp) |
| Series | SIRIUS 3RH1 | SIRIUS 3RH1 | SIRIUS 3RH1 | SIRIUS 3RH1 |
| Similarity (0–1) | — | 0.9139 | 0.8212 | 0.8202 |
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3RH1921-1CA01 shares the 1NC contact type and front-mount form factor; the suffix difference (2CA vs. 1CA) indicates a late-break variant. Stock availability is notably higher at 55 units.
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3RH1921-2CA10 differs in contact polarity—1NO rather than 1NC—while retaining the same front-mount CC designation and contactor compatibility.
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3RH1921-2DA11 introduces cage clamp termination as the distinguishing feature; it provides a mixed 1NO + 1NC contact set in a front-mount form factor.