Siemens 3RT20151AB01 Size S00 Electromechanical Contactor
Overview
For any motor-starter or power-switching application, the contactor's switching voltage rating, dielectric withstand, and breaking-capacity class are the critical safety gates—none of these appear in the supplied catalog fields. The Siemens 3RT20151AB01 is a Size S00 (S0 frame), three-pole, normally-open electromechanical contactor with a 24 VAC control coil and a 7 A contact rating at the main poles. It carries auxiliary contacts as a standard feature and mounts to chassis or DIN rail.
Ordering-code context (verify on datasheet): The "3RT2015" base number places this in the Siemens SIRIUS 3RT1 series Size S00 family; the "AB" field position encodes coil voltage and auxiliary contact arrangement. This family uses screw-type load terminals and is designed for AC-3 motor duty per IEC 60947-4-1.
Key Parameters
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Base Product Number | 3RT2015 | — | Shares S00 frame with all listed alternates |
| Contact Form | 3PST-NO (3 Form A) | – | Three independent normally-open poles |
| Contact Rating (Current) | 7 | A | At stated switching voltage only; no value given |
| Coil Voltage | 24 | VAC | Must match control-circuit supply |
| Must Operate Voltage | 20.4 | VAC | 85 % of nominal per IEC |
| Operate Time | 35 | ms | Pull-in time; release time not listed |
| Operating Temperature | 25 to 60 | °C | Range is narrow; verify for enclosure derating |
| Mounting Type | Chassis Mount, DIN Rail | – | 35 mm standard rail |
Verification required before selection
The following fields are not present in the supplied catalog data:
- Switching voltage (max) — the maximum voltage the main poles can interrupt at rated current
- Breaking capacity / AC-3 rating (kW or hp) — required for motor-branch coordination
- Dielectric strength — insulation clearance between poles and to coil
- Release time — drop-out timing; only operate time is listed
- Coil power (VA or W) — not supplied for the seed; alternates show ~24–27 VA
- Termination style / terminal type — screw specified in title but no pitch or torque data
- Mechanical endurance — cycles to failure not listed
- Weight / dimensions — not provided; S00 frame envelope must be confirmed
Do not proceed with selection on electrical ratings until verified against the Siemens SIRIUS 3RT1 datasheet.
Integration / Installation Notes
The seed lists Chassis Mount, DIN Rail mounting; no IP rating, terminal torque, or wire-gauge guidance appears in the supplied fields. The SCRW suffix in the title implies screw-type load terminals, but terminal pitch, recommended wire size, and torque values must come from the datasheet.
For control-circuit integration: coil voltage is 24 VAC. The Must Operate Voltage of 20.4 VAC (85 % of nominal) is typical IEC practice, but the datasheet must confirm hold-current and dropout performance at the specific supply characteristics in the end application.
Operating temperature range is listed as 25°C to 60°C. This is notably narrower than many industrial contactor ranges; verify that the enclosure ambient in the target cabinet stays within this window, particularly under load.
Selection / Substitution Guidance
The three listed alternates that share the same coil voltage (24 VAC) and 1NO auxiliary contact arrangement are:
| MPN | Contact Form | Encapsulation | Notes |
|---|---|---|---|
| 3RT20151AB011AA0 | 3PST-NO | Box | Adds coil power 24.3 VA; identical electrical spec |
| 3RT20151AB012AA0 | 3PST-NO | Box | Same; Coil Power 24.3 VA |
| 3RT20151AB02 | 3PST-NO | Bulk | 1NC instead of 1NO auxiliary; Coil Power 27 VA |
If the auxiliary contact logic (NO vs. NC) is fixed by the application, changing between 1NO and 1NC variants requires circuit-level validation. The boxed alternates differ only in packaging type (tray/box vs. bulk) and, for substitution purposes, should not affect electrical performance—but torque and terminations still require datasheet confirmation.
Coil voltage variants (42 VAC, 48 VAC, 240 VAC, 400 VAC) are available within the same base series; substituting a different coil voltage requires matching the control-circuit supply in the target installation.
Similar Catalog Parts
The catalog similarity search returned eight alternates sharing the 3RT2015 base number and Size S00 frame.
| MPN | Coil Voltage | Contact Form | Contact Rating | Encapsulation | Similarity |
|---|---|---|---|---|---|
| 3RT20151AB01 (seed) | 24 VAC | 3PST-NO | 7 A | Bulk | 1.0 |
| 3RT20151AB011AA0 | 24 VAC | 3PST-NO | 7 A | Box | 1.0 |
| 3RT20151AB012AA0 | 24 VAC | 3PST-NO | 7 A | Box | 1.0 |
| 3RT20151AB02 | 24 VAC | 3PST-NO | 7 A | Bulk | 1.0 |
Why these are similar: All four share the same brand (Siemens), the same 3RT2015 base product number, identical contact form (3PST-NO), 7 A contact rating, 35 ms operate time, and DIN Rail / Chassis Mount. They differ in auxiliary contact type (1NO vs. 1NC), packaging (Bulk vs. Box), and coil power specification (~24–27 VA where listed).
The remaining alternates (3RT20151AD01, 3RT20151AH01, 3RT20151AU01, 3RT20151AV01) differ only in coil voltage (42, 48, 240, 400 VAC respectively) and their corresponding must-operate thresholds. Similarity scores of 0.96 reflect the same base family and contact rating with a changed coil voltage.
Similarity is a catalog proximity metric, not a quality or interchangeability ranking. Substitution across coil voltages requires control-circuit compatibility verification.
FAQ
What coil voltage does the Siemens 3RT20151AB01 use? The coil voltage is listed as 24 VAC with a must-operate voltage of 20.4 VAC (85 % of nominal).
Does the 3RT20151AB01 have auxiliary contacts included? Yes — the "Features" field lists "Auxiliary Contacts." The exact arrangement (1NO, 1NC, or 2NO) is not fully broken out in the supplied fields; compare with the datasheet to confirm whether it matches 1NO (3RT20151AB01) or 1NC (3RT20151AB02).
What mounting options does the 3RT20151AB01 support? The listed mounting type is Chassis Mount, DIN Rail (35 mm standard rail). Specific cutout dimensions and DIN-rail clip torque settings are not in the supplied fields and must be confirmed against the datasheet.