Siemens 3RT20151AB01 Contactors
Selection trade-offs for the 3RT2015 family
The Siemens 3RT2015 series positions 7 A electromechanical contactors for light motor and distribution duties in control panels. Variant selection hinges on four parameters recorded across catalog entries:
- Coil voltage selection: Catalog entries span 24 VAC through 400 VAC. Must-operate voltage scales proportionally (20.4 VAC at 24 VAC coil; 340 VAC at 400 VAC coil). Mismatched coil voltage prevents pickup regardless of load-side ratings.
- Auxiliary contact arrangement: The 3RT20151AB01 carries one normally-open (1NO) auxiliary contact. Alternates 3RT20151AB02 and 3RT20151AB021AA0 specify normally-closed (1NC) auxiliary in otherwise identical packages. Control-circuit logic type (hold-in vs dropout) governs which arrangement suits a given schematic.
- Encapsulation and packaging: The seed variant lists Bulk packaging; several alternates (3RT20151AB011AA0, 3RT20151AB012AA0, 3RT20151AV01, 3RT20151AD01, 3RT20151AQ01, 3RT20151AH01) are cataloged as Box. Unit quantity and handling preferences may dictate which package form suits a given order.
- Coil power consumption: Alternates with Box encapsulation specify 24.3 VA pull; the 3RT20151AB02 (Bulk) lists 27 VA. Power-supply sizing and thermal headroom in enclosed panels follow from these figures.
Key specifications (3RT20151AB01)
| Parameter | Value |
|---|---|
| Base Product Number | 3RT2015 |
| Contact Form | 3PST-NO (3 Form A) |
| Contact Rating | 7 A |
| Coil Voltage | 24 VAC |
| Must Operate Voltage | 20.4 VAC |
| Operate Time | 35 ms |
| Mounting Type | Chassis Mount, DIN Rail |
| Operating Temperature | 25°C ~ 60°C |
| Features | Auxiliary Contacts |
| Encapsulation | Bulk |
Catalog comparison — 3RT2015 variants
| MPN | Coil Voltage | Contact Form | Must Operate | Coil Power | Encapsulation | Similarity |
|---|---|---|---|---|---|---|
| 3RT20151AB01 | 24 VAC | 3PST-NO (1NO aux) | 20.4 VAC | — | Bulk | 1.0 |
| 3RT20151AB011AA0 | 24 VAC | 3PST-NO (1NO aux) | 20.4 VAC | 24.3 VA | Box | 1.0 |
| 3RT20151AB012AA0 | 24 VAC | 3PST-NO (1NO aux) | 20.4 VAC | 24.3 VA | Box | 1.0 |
| 3RT20151AB02 | 24 VAC | 3PST-NO (1NC aux) | 20.4 VAC | 27 VA | Bulk | 1.0 |
| 3RT20151AV01 | 400 VAC | 3PST-NO (1NO aux) | 340 VAC | 24.3 VA | Box | 0.96 |
| 3RT20151AD01 | 42 VAC | 3PST-NO (1NO aux) | 35.7 VAC | 24.3 VA | Box | 0.96 |
The top three similarity-1.0 alternates differ from the seed only in packaging and (for the 3RT20151AB02) auxiliary contact state. These variants require the reader's own engineering qualification before substitution.
Why these variants appear similar: All share the 3RT2015 base product number, 7 A contact rating, three-pole normally-open arrangement, 35 ms operate time, and DIN Rail / chassis mounting. The must-operate voltage threshold and coil power diverge only as a direct function of the coil voltage chosen across the family range.
FAQ
Does the 3RT20151AB01 include an auxiliary contact? Yes — the catalog entry lists "Auxiliary Contacts" under Features; the contact form is specified as 3PST-NO with one normally-open auxiliary contact.
What coil voltage does the 3RT20151AB01 require? The specified coil voltage is 24 VAC with a must-operate threshold of 20.4 VAC.
Can a 400 VAC coil variant replace the 24 VAC version in the same enclosure footprint? No — coil voltage is a fixed selection per unit; swapping to 3RT20151AV01 or other higher-voltage coils requires a different control transformer or supply arrangement and re-verification of must-operate voltage against the available control voltage.