Siemens 3RT20151AB01 | S00 Frame 7 A Contactors
Coil and Control Trade-offs for 3RT2015 S00 Contactors
- Must-operate voltage 20.4 VAC — ensures pull-in below 85% of nominal coil voltage, but limits use in severely undervoltage conditions common with long control runs.
- Operate time 35 ms — adequate for general motor startup sequencing; however, faster logic circuits or safety-related de-energization may require supplementary intermediate relays.
- Operating temperature 25°C–60°C — not suited for unventilated enclosures in high-ambient installations without thermal derating; Siemens specifies 7 A AC-3 at 60°C with standard ventilation.
- Bulk vs. box packaging — seed is bulk-packed; alternates 3RT20151AB011AA0 and 3RT20151AB012AA0 ship in box packaging, affecting inventory staging for service-stock workflows.
Contact Configuration Comparison
The seed (3RT20151AB01) is one of eight S00-frame variants sharing identical 7 A AC-3 ratings, chassis/DIN mounting, and 35 ms operate time. Coil voltage is the primary differentiator. Voltage selection must account for must-operate thresholds and control-circuit architecture.
| Parameter | 3RT20151AB01 | 3RT20151AB011AA0 | 3RT20151AB012AA0 | 3RT20151AB02 |
|---|---|---|---|---|
| Coil Voltage | 24 VAC | 24 VAC | 24 VAC | 24 VAC |
| Contact Form | 3PST-NO | 3PST-NO | 3PST-NO | 3PST-NO |
| Contact Rating | 7 A | 7 A | 7 A | 7 A |
| Mounting | Chassis, DIN Rail | Chassis, DIN Rail | Chassis, DIN Rail | Chassis, DIN Rail |
| Encapsulation | Bulk | Box | Box | Bulk |
| Similarity | — | 1.0 | 1.0 | 1.0 |
Additional alternates with differing coil voltages (all S00 frame, 7 A, chassis/DIN mount):
- 3RT20151AV01 — 400 VAC coil (must-operate 340 VAC)
- 3RT20151AU01 — 240 VAC coil (must-operate 204 VAC)
- 3RT20151AH01 — 48 VAC coil (must-operate 40.8 VAC)
- 3RT20151AD01 — 42 VAC coil (must-operate 35.7 VAC)
Readers must verify coil voltage compatibility against their control-circuit nominal voltage and acceptable voltage-drop budget before specifying any variant.
Why these are similar: All eight parts share the same base number 3RT2015, identical 7 A contact rating, identical mounting provisions, and the S00 frame mechanical envelope. Differences are limited to coil voltage and packaging type.
Engineering Verification Checklist
- Confirm control-circuit nominal voltage matches coil rating (24 VAC for seed).
- Verify must-operate voltage (20.4 VAC) is below worst-case control-circuit voltage under load.
- Check panel ambient temperature and ventilation; derate if > 50°C enclosure temperature.
- Validate AC-3 utilization category suits motor load (7 A, 3-phase nominal).
- Confirm DIN rail or chassis mounting compatible with existing enclosure layout.
- Verify auxiliary contact configuration (1NO on seed) meets status-feedback or interlock requirements.
- Confirm packaging (bulk vs. box) aligns with inventory and service-stock policies.
- Review coil power draw (listed on alternate records as 24.3 VA) against control-transformer or supply capacity.