SIEMENS
SIEMENS 3RT20171AB02 Contactor 24V AC 3P 12A 1NC
IEC magnetic contactor with 24 V AC coil, three poles, 12 A inductive rating and one normally-closed auxiliary contact
- Coil runs on 24 V AC control voltage
- Three power poles switch up to 12 A inductive load
- Single normally-closed auxiliary contact built in
- Screw terminals accept solid or stranded wire
- DIN-rail or surface mounting simplifies installation
IEC magnetic contactor for motor control
This IEC magnetic contactor switches three-phase loads up to 12 A inductive or 22 A resistive. It operates on a 24 V AC coil and mounts on DIN rail or flat surfaces. The S00 frame size fits compact panels and machine builders who need a small, non-reversing starter.
Coil voltage and pole count set the application
The 24 V AC coil requires a matching control transformer or supply; it will not work on DC or higher voltages. Three poles handle three-phase circuits only, so single-phase or DC loads need a different device. The non-reversing design means direction change requires additional components.
12 A inductive rating decides if the part fits
Full-load inductive current of 12 A is the key figure for motor-starting duty; exceeding it risks contact welding or overheating. Resistive loads up to 22 A are supported, but motor loads must stay at or below 12 A. One normally-closed auxiliary contact is included for interlock or status feedback.
Highlights
- Coil runs on 24 V AC control voltage
- Three power poles switch up to 12 A inductive load
- Single normally-closed auxiliary contact built in
- Screw terminals accept solid or stranded wire
- DIN-rail or surface mounting simplifies installation
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
How do I choose between the 12 A inductive and 22 A resistive ratings for my load?
Use the 12 A rating for motor or transformer loads and the 22 A rating for heating or lighting loads; the contactor carries both values simultaneously.
What does the 12 A full-load inductive current mean when the contactor is installed in a panel?
It is the maximum continuous current the main poles can switch for inductive loads such as motors at the rated 24 V AC coil voltage.
What does the screw-terminal interface cap in practice for wire size and torque?
Screw terminals accept solid or stranded conductors up to the frame S00 limit and must be tightened to the manufacturer’s specified torque.
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