Siemens 3RT20171AF01 Contactor
Selection Trade-offs for the 3RT20171AF01
The 3RT20171AF01 is a Siemens SIRIUS 3RT2017 series Size S00 electromechanical contactor with a 12 A contact rating, 110 VAC coil, and auxiliary-contact-equipped 3PST-NO main pole configuration.
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Coil voltage class: 110 VAC coil requires a corresponding control-circuit voltage. The must-operate threshold is 93.5 VAC. Verify that the available control power maintains adequate margin above this pickup voltage under expected line conditions.
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Auxiliary contact configuration: The primary listing carries one normally-open (1NO) auxiliary contact designation. If a normally-closed (NC) auxiliary is required for status or interlock signaling, the catalog peer 3RT20171AF02 shares all other stated parameters but substitutes a 1NC configuration.
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Operating temperature window: The stated range is 25°C to 60°C. This device is not specified for cold-start or outdoor ambient-freezing environments. If the enclosure or panel operates near either boundary, confirm thermal derating is acceptable for the specific load duty cycle.
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Coil power and inrush: At 37 VA, the pull-in VA differs from the 33 VA class common to most other voltage variants in this 3RT2017 family. This affects control-transformer sizing or supply unit selection if upgrading or standardizing a panel.
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Encapsulation and packaging: The seed is listed as bulk packaging rather than box quantities. If the procurement strategy requires fixed pack counts or if automated insertion is planned, verify compatibility with the bulk form factor.
Technical Parameters
| Parameter | Value |
|---|---|
| Base Product Number | 3RT2017 |
| Contact Form | 3PST-NO (3 Form A) |
| Contact Rating | 12 A |
| Coil Voltage | 110 VAC |
| Must Operate Voltage | 93.5 VAC |
| Coil Power | 37 VA |
| Operate Time | 33 ms |
| Mounting Type | Chassis Mount, DIN Rail |
| Features | Auxiliary Contacts |
| Encapsulation | Bulk |
| Operating Temperature | 25°C ~ 60°C |
Similar Catalog Parts
The table below presents in-catalog peers sharing the same base product number and contact rating. These rows are listed for catalog-level screening; none constitute OEM-approved interchange without the reader's own qualification.
| MPN | Coil Voltage | Must Operate | Coil Power | Operate Time | Contact Form | Encapsulation | Similarity |
|---|---|---|---|---|---|---|---|
| 3RT20171AF01 | 110VAC | 93.5 VAC | 37VA | 33 ms | 3PST-NO | Bulk | — |
| 3RT20171AF02 | 110VAC | 93.5 VAC | 33VA | 35 ms | 3PST-NO | Box | 1.00 |
| 3RT20171AP01 | 230VAC | 195.5 VAC | 37VA | 33 ms | 3PST-NO | Bulk | 0.96 |
| 3RT20171AQ01 | 380VAC | 323 VAC | 33VA | 35 ms | 3PST-NO | Box | 0.96 |
Why 3RT20171AF02 is catalog-similar: Shares the identical coil voltage class (110VAC), contact form (3PST-NO), base product number, and auxiliary-contact feature. The sole stated difference is NC vs NO auxiliary type, and a slight variation in coil power (33 VA vs 37 VA) and operate time (35 ms vs 33 ms).
Why 3RT20171AP01 is catalog-similar: Matches on contact rating (12 A), base product number, bulk encapsulation, and 37 VA coil power. Differs in coil voltage class (230VAC vs 110VAC) and corresponding must-operate threshold (195.5 VAC), making it a different control-circuit voltage option within the same frame.
Why 3RT20171AQ01 is catalog-similar: Shares the 3RT2017 base, 3PST-NO contact form, and auxiliary-contact feature. The 380VAC coil class places it in a higher voltage control circuit tier, with must-operate at 323 VAC.
FAQ
What control-circuit voltage is required for the 3RT20171AF01 to pull in? The must-operate voltage is 93.5 VAC. The coil is rated at 110 VAC nominal.
Does the 3RT20171AF01 include auxiliary contacts? Yes. The listing specifies "Auxiliary Contacts" as a feature and a 1NO main pole contact form.
What is the switching time of the 3RT20171AF01? Operate time is listed as 33 ms. Release time is not present in the catalog record.