Siemens 3RT20251AP00 Size S0 Contactor
| Parameter | Value |
|---|---|
| Base Product Number | 3RT2025 |
| Mfr | Siemens |
| Coil Voltage | 230 VAC |
| Coil Power | 65 VA |
| Contact Form | 3PST-NO (3 Form A) |
| Contact Rating (Current) | 40 A |
| Must Operate Voltage | 184 VAC |
| Operate Time | 38 ms |
| Operating Temperature | 25°C – 60°C |
| Mounting Type | Chassis Mount, DIN Rail |
| Encapsulation | Bulk |
| Features | Auxiliary Contacts |
The 3RT20251AP00 is a Siemens SIRIUS 3RT2025 family Size S0 electromechanical contactor with a 230 VAC coil. It provides three normally-open power poles rated 40 A and includes an integrated auxiliary contact arrangement (1NO/1NC). The contactor ships in bulk packaging and mounts directly to chassis or a standard 35 mm DIN rail.
The S0 frame designation corresponds to the SIRIUS compact footprint used in motor branch and general-purpose switching applications. The 3RT prefix identifies this as an AC-operated contactor in the Siemens SIRIUS modular system, which shares common accessories such as auxiliary contact blocks and surge suppressors across the size range.
Performance Characteristics
Coil data: The 230 VAC coil draws approximately 65 VA during inrush and operates reliably down to 184 VAC (must-operate threshold). Response time is listed at 38 ms operate. The operating temperature window spans 25°C to 60°C.
Power contacts: Three Form A poles are provided. The listed contact rating of 40 A reflects the maximum current rating under the stated test conditions associated with this catalog entry.
Auxiliary function: The integrated 1NO/1NC auxiliary contact block supports control-circuit feedback, interlock signaling, or PLC interface without requiring separate addon modules.
Installation Options
- DIN rail mounting: Accepts standard 35 mm top-hat rail per IEC 60715.
- Chassis mounting: Direct screw mounting where panel rail space is unavailable.
- Accessories: The SIRIUS 3RT S0 size shares the accessory ecosystem with other 3RT2025 variants (auxiliary contact expansions, surge suppressors); compatibility should be verified against the specific variant suffix.
Catalog Comparison with S0 Family Voltage Variants
The table below presents shared spec keys for the primary part and in-catalog voltage variants sharing the 3RT2025 base product number. All parts listed require individual qualification for any given application.
| Parameter | 3RT20251AP00 | 3RT20251AP60 | 3RT20251AV00 | 3RT20251AB00 |
|---|---|---|---|---|
| Coil Voltage | 230 VAC | 240 VAC | 400 VAC | 24 VAC |
| Coil Power | 65 VA | 68 VA | 65 VA | 65 VA |
| Contact Rating | 40 A | 40 A | 17 A | 16 A |
| Must Operate Voltage | 184 VAC | 192 VAC | 320 VAC | 19.2 VAC |
| Operate Time | 38 ms | 38 ms | 40 ms | 38 ms |
| Operating Temperature | 25°C – 60°C | 25°C – 60°C | 25°C – 60°C | 25°C – 60°C |
| Mounting | Chassis / DIN Rail | Chassis / DIN Rail | Chassis / DIN Rail | Chassis / DIN Rail |
| Contact Form | 3PST-NO | 3PST-NO | 3PST-NO | 3PST-NO |
| Encapsulation | Bulk | Bulk | Box | Bulk |
| Similarity | — | 1.0 | 0.96 | 0.96 |
Why These Parts Appear Similar
-
3RT20251AP60 shares the same S0 frame, bulk packaging, 40 A contact rating, and 240 VAC coil voltage. The must-operate threshold scales proportionally with nominal coil voltage (192 VAC vs 184 VAC).
-
3RT20251AV00 is the 400 VAC coil variant within the same base product series. The coil power remains 65 VA, and mounting/contact form are identical. The listed contact rating of 17 A reflects the catalog entry for this specific voltage configuration; the reader's coordination study should confirm rating adequacy for the target load.
-
3RT20251AB00 matches the 24 VAC coil subset of the family. The must-operate voltage of 19.2 VAC (80% of nominal) is consistent with the pickup threshold logic used across the SIRIUS 3RT series.
The similarity scores reflect catalog-level parametric overlap and shared prefix characters; they do not indicate interchangeability or approved substitution. Coil voltage selection must match the available control-circuit voltage in the target installation.
FAQ
What coil voltage does the 3RT20251AP00 require? The 3RT20251AP00 uses a 230 VAC coil and will reliably pick up when the coil voltage reaches 184 VAC or higher.
Can the 3RT20251AP00 be mounted on a standard DIN rail? Yes. It supports both chassis mount and 35 mm top-hat DIN rail (IEC 60715) mounting.
Does the 3RT20251AP00 include built-in auxiliary contacts? Yes. The unit integrates a 1NO/1NC auxiliary contact block as a standard feature.