Siemens 3RH21311AF00 Auxiliary Contactor Relay
Siemens 3RH21311 Series — Key Specifications
| Parameter | 3RH21311AF00 (Seed) | 3RH21311AB00 | 3RH21311AP00 | 3RH21311AV00 |
|---|---|---|---|---|
| Coil Voltage | 110 VAC | 24 VAC | 230 VAC | 400 VAC |
| Must Operate | 93.5 VAC | 20.4 VAC | 195.5 VAC | 340 VAC |
| Coil Power | 37 VA | 37 VA | 37 VA | 37 VA |
| Contact Form | 3PST-NO (3 Form A) | 3PST-NO (3 Form A) | 3PST-NO (3 Form A) | 4PST-3NO/1NC |
| Contact Rating | — | — | — | 10 A |
| Operate Time | 33 ms | 33 ms | 33 ms | 33 ms |
| Mounting | Chassis / DIN Rail | Chassis / DIN Rail | Chassis / DIN Rail | Chassis / DIN Rail |
| Operating Temp | 25°C–60°C | 25°C–60°C | 25°C–60°C | 25°C–60°C |
All variants share the same base part number (3RH21311) and coil power consumption of 37 VA. Contact form differs: some variants list 3PST-NO while others specify 4PST-3NO/1NC (three normally-open plus one normally-closed auxiliary contact).
Contactor Relay Comparison (Siemens 3RH21311 Coil Voltage Family)
| MPN | Coil Voltage | Must Operate | Contact Form | Encapsulation |
|---|---|---|---|---|
| 3RH21311AF00 | 110 VAC | 93.5 VAC | 3PST-NO | Bulk |
| 3RH21311AB00 | 24 VAC | 20.4 VAC | 3PST-NO | Bulk |
| 3RH21311AD00 | 42 VAC | 35.7 VAC | 4PST-3NO/1NC | Box |
| 3RH21311AH00 | 48 VAC | 40.8 VAC | 4PST-3NO/1NC | Box |
| 3RH21311AP00 | 230 VAC | 195.5 VAC | 3PST-NO | Bulk |
| 3RH21311AP60 | 240 VAC | 204 VAC | 3PST-NO | Bulk |
| 3RH21311AU00 | 240 VAC | 204 VAC | 4PST-3NO/1NC | Box |
| 3RH21311AQ00 | 380 VAC | 323 VAC | 4PST-3NO/1NC | Box |
| 3RH21311AV00 | 400 VAC | 340 VAC | 4PST-3NO/1NC | Box |
The reader must qualify these alternatives independently; numeric similarity scores do not indicate quality ranking.
- 3RH21311AP00 (230 VAC) shares bulk encapsulation and three-pole NO contact arrangement with the seed; coil voltage differs by roughly 2×, changing must-operate threshold from 93.5 to 195.5 VAC.
- 3RH21311AV00 (400 VAC) matches mounting type and coil power but escalates must-operate voltage to 340 VAC and expands contact form to include one NC auxiliary pole.
- 3RH21311AB00 (24 VAC) aligns on contact form, encapsulation, and mounting; the lower coil voltage reduces must-operate threshold to 20.4 VAC, suited for lower-voltage control circuits.
Auxiliary Contact Configuration Notes
The 3RH21311 series provides either three normally-open power contacts or three NO plus one NC auxiliary contact depending on suffix code. Bulk-packaged variants tend toward the 3PST-NO configuration; box-packaged variants more commonly include the 4PST-3NO/1NC arrangement. Panel builders specifying auxiliary feedback for status indication should prefer the NC pole variant.
DIN Rail mounting uses standard 35 mm rail profile. The 33 ms operate time applies across all coil voltages in this series.