SIEMENS
SIEMENS 3RT20281AC20 IEC Magnetic Contactor 24V AC 3P
IEC magnetic contactor with 24 V AC coil, three poles, 38 A inductive and 50 A resistive ratings, screw terminals and DIN-rail mounting
- 24 V AC coil voltage suits low-voltage control circuits
- 38 A inductive full-load current handles demanding motor loads
- 50 A resistive full-load current supports heating and lighting circuits
- 3-pole configuration switches three-phase power in one device
- DIN-rail or surface mounting simplifies panel installation
SIEMENS 3RT2028 IEC Magnetic Contactor
The SIEMENS 3RT20281AC20 is a three-pole IEC magnetic contactor with a 24V AC coil and 1NO/1NC auxiliary contacts. It handles 38 A inductive and 50 A resistive full-load current in a S0 frame size. The unit mounts on DIN rail or surface and uses screw terminals for connections. It suits industrial motor-starting and control circuits requiring IEC-rated switching.
Upgrade from lower-rated or non-IEC contactors
This contactor replaces older starters that cannot meet 38 A inductive or 50 A resistive loads at 24V AC coil voltage. The jump is worth it when your application demands the S0 frame dimensions of 2.15 in height and 3.55 in width with IEC compliance. Non-reversing operation means it fits single-direction motor circuits without added complexity.
Check coil voltage and mounting before ordering
Verify your control circuit supplies 24V AC to match the coil rating. Confirm the panel space accommodates 2.15 in height and 3.55 in width for the S0 frame. Ensure DIN rail or surface mounting matches your enclosure layout. The screw-terminal connections require appropriate wire gauges for 38 A inductive or 50 A resistive loads.
Highlights
- 24 V AC coil voltage suits low-voltage control circuits
- 38 A inductive full-load current handles demanding motor loads
- 50 A resistive full-load current supports heating and lighting circuits
- 3-pole configuration switches three-phase power in one device
- DIN-rail or surface mounting simplifies panel installation
Specifications
| Brand | SIEMENS |
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Questions about this item
What DIN-rail and surface-mount space does the S0 frame contactor with 2.15 in height and 3.55 in width require?
The unit fits a standard DIN rail or can be surface mounted; allow at least 2.15 in height by 3.55 in width plus wiring clearance.
How is the 24 V AC coil wired on the screw terminals, and what step is often missed?
Connect the coil to the designated A1 and A2 screw terminals; the common mistake is leaving the auxiliary 1NO/1NC contacts unwired when the control circuit needs feedback.
When should the main power contacts rated for 38 A inductive and 50 A resistive be inspected or replaced?
Inspect the main contacts after heavy inching or frequent motor starts; replace the contactor if contact erosion causes voltage drop or overheating at the rated currents.
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