SIEMENS
SIEMENS 3RT20251AC20 IEC Magnetic Contactor 24V AC 3P 17A 40A 1NO/1NC
IEC magnetic contactor switches three-phase loads up to 17 A inductive or 40 A resistive with a 24 V AC coil and 1NO/1NC auxiliary contacts
- Handles inductive loads up to 17 A reliably
- Switches resistive loads up to 40 A safely
- Operates on standard 24 V AC control circuits
- Compact 3.6 in height fits tight panels
- Mounts on DIN rail or surface for flexibility
IEC Magnetic Contactor 24V AC
The SIEMENS 3RT20251AC20 is a three-pole IEC magnetic contactor designed for switching inductive loads up to 17 A and resistive loads up to 40 A. It operates on a 24 V AC coil and provides one normally open and one normally closed auxiliary contact for control-circuit feedback. The unit mounts on DIN rail or a flat surface within a compact frame size S0.
Coil voltage and pole limits
The 24 V AC coil voltage restricts use to control circuits that supply this exact potential; higher or lower voltages will not operate the contactor reliably. Three poles handle three-phase motor circuits, but the contactor has no reversing capability, so it cannot change motor direction by itself. Inductive rating of 17 A and resistive rating of 40 A define the maximum continuous current per pole.
Auxiliary contacts and mounting check
Verify that your control circuit can deliver 24 V AC to the coil and that the auxiliary contact arrangement of 1NO/1NC matches your feedback or interlock requirements. Confirm the DIN rail or surface mounting footprint fits the 3.6 in height and 1.7 in width dimensions. Ensure screw-terminal connections suit your wire gauge and termination practice.
Highlights
- Handles inductive loads up to 17 A reliably
- Switches resistive loads up to 40 A safely
- Operates on standard 24 V AC control circuits
- Compact 3.6 in height fits tight panels
- Mounts on DIN rail or surface for flexibility
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
Which coil voltage and pole configuration should I select for a 24 V AC control circuit?
This contactor has a fixed 24 V AC coil and three main poles, so no alternative coil or pole options exist for this part number.
What does the 17 A inductive rating mean when the contactor is installed in a motor starter?
It indicates the maximum continuous current the main contacts can switch for inductive loads such as motors under AC-3 duty.
How does the IEC frame size S0 limit the contactor's application?
Frame size S0 defines the physical envelope and the 17 A inductive / 40 A resistive current limits for this series.
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