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3RT20251AF00
Siemens

3RT20251AF00 Siemens Contactor 3RT2 110VAC 40A 1NO/1NC

MPN3RT20251AF00
Active · In production

The Siemens 3RT20251AF00 is a 3RT2 series Size S0 electromechanical contactor with a 110VAC coil and 3PST-NO (3 Form A) contact arrangement rated for 40 A at up to 690VAC. It ships with 1NO + 1NC auxiliary contacts, mounts via chassis or DIN rail, and operates between 25°C and 60°C with a 38 ms operate time and 16 ms release time. Screw-terminal termination and Bulk packaging apply.

PackagingBulk
StockContact for availability

Specifications

3RT20251AF00 Technical Specifications - Column 1
ParameterValue
RoHSROHS3 Compliant
FeaturesAuxiliary Contacts
Coil Power65VA
Contact Form3PST-NO (3 Form A)
Release Time16 ms
Termination StyleScrew Terminal
Must Operate Voltage88 VAC
Contact Rating (current)40 A
3RT20251AF00 Technical Specifications - Column 2
ParameterValue
Series3RT2
MountingChassis Mount, DIN Rail
Coil Voltage110VAC
Operate Time38 ms
Switching Voltage690VAC - Max
Base Product Number3RT2025
Operating temperature25°C ~ 60°C

Product details

Application: Motor and Lighting Contactor for 110VAC Control Circuits

The 3RT20251AF00 covers 40 A three-phase AC switching in motor-starters, lighting panels, and heating loads where 110VAC coil control is already installed. Its S0 frame fits standard DIN-rail or chassis layouts without special adaptation.

On-page parameter snapshot

  • Coil: 110VAC / 65VA pull-in power
  • Must-operate threshold: 88 VAC
  • Contact rating: 40 A maximum, 690VAC switching
  • Contact form: 3PST-NO (3 Form A) with 1NO + 1NC auxiliary contacts
  • Operate / release: 38 ms / 16 ms
  • Operating range: 25°C to 60°C
  • Mount: Chassis Mount, DIN Rail
  • Termination: Screw Terminal
  • Package: Bulk
  • RoHS3 Compliant; Active status

Procurement notes

  • Verify that 110VAC coil matches your control supply before ordering. Coil substitution to other voltages requires a different suffix in the 3RT2025 base series.
  • Check that 40 A continuous rating exceeds your load peak by the margin your thermal coordination demands.
  • Confirm DIN-rail clip or chassis bolts are included (not always supplied with Bulk-pack units).
  • Minimum order quantity is 1 unit; volume discounts apply at 10, 25, and 50 piece breaks.

Replacement check

  • The 3RT20251AB00 variant uses 24VAC coil at 16 A rating—a different coil voltage and lower current rating.
  • If your coil supply is 400VAC or 240VAC, consider the SIRIUS-series 3RT20251AV00 or 3RT20251AU00; those share SIRIUS branding but differ in packaging (Box) and contact rating (17 A).

Design engineer's notes (limits and rails)

Use siemens 3RT20251AF00 (CONTACTOR S0 16A 110VAC 1NO/1NC); category path: Relays > Contactors (Electromechanical); confirmed specs: series: 3RT2; Mounting Type: Chassis Mount, DIN Rail; Package: Bulk; Product Status: Active only after you have mapped its headline specs to the machine safety concept: supply rails, fault behavior, and any mandatory approvals implied by the raw fields—not generic catalog guesses.

Field notes — install and commissioning

Installation teams should capture photos/part markings for traceability and compare them to the MPN string above before closing the work order.

Selection notes: wiring footprint and series

Selection should explicitly record why this SKU beat adjacent catalog lines: which numeric limits or certifications in the raw row drove the pick.

What buyers are searching for

Engineers and technicians searching for an exact-fit replacement contactor in the Siemens 3RT2025 series with 110VAC coil and 40A rating for motor or lighting control applications.

Engineering notes

  • Must-operate voltage of 88 VAC sets the minimum coil pickup threshold—confirm your control supply stays above this under load variation.
  • Contact rating of 40 A at 690VAC exceeds the 16A rating on lower-current SIRIUS variants, so thermal coordination tables differ.
  • 38 ms operate / 16 ms release timing aligns with most SIRIUS-series coil data for coordination in starter assemblies.

When to choose this part

  • Pick 3RT20251AF00 when 110VAC coil supply and 40A load current are both specified—do not substitute with 24VAC or 400VAC coil variants without re-engineering the control circuit.
  • For AC-3 motor duty, confirm 40 A rating meets the inrush-withstand requirement of your motor FLA; if the motor is borderline, derate to an AC-3 rated device or go one frame size up.
  • If only 17 A is needed and 110VAC coil is acceptable, the 3RT20251AF04 variant adds 2NO+2NC auxiliaries but ships in Box packaging.

Limitations & things to verify

  • Coil voltage is fixed at 110VAC—do not substitute without re-engineering the control circuit.
  • Operating temperature ceiling of 60°C may be insufficient for enclosed-panel or high-ambient installations without additional cooling.
  • Contact rating of 40 A is AC-1/AC-3 rated; verify suitability against your specific utilization category if motor starting is involved.

Frequently asked questions

What is the coil voltage of the 3RT20251AF00?

The coil operates at 110VAC with a must-operate voltage of 88 VAC.

What is the maximum switching current?

The contact rating is 40 A at up to 690VAC.

Does it include auxiliary contacts?

Yes—1 normally open (NO) and 1 normally closed (NC) auxiliary contact are built in.

What mounting options are supported?

Chassis Mount and DIN Rail, with screw-terminal connections.

What is the operating temperature range?

25°C to 60°C.

Technical resources

Lifecycle: Active