SIEMENS
SIEMENS 3RT20181AK643MA0 IEC Magnetic Contactor 2NC/2NO 110-120V AC 3P
IEC magnetic contactor with 2NO/2NC auxiliary contacts, 110-120V AC coil, three poles, 16 A inductive and 22 A resistive ratings, screw terminals, DIN-rail or surface mounting in frame size S00
- IEC-compliant contactor rated for 16 A inductive loads
- 110-120 V AC coil suits standard control circuits
- Four auxiliary contacts (2NO/2NC) simplify wiring
- Screw terminals and DIN-rail mount speed installation
- Compact 4.73 × 1.97 in footprint fits tight panels
SIEMENS IEC Magnetic Contactor 3-Pole
The SIEMENS 3RT20181AK643MA0 is a three-pole IEC magnetic contactor designed for switching motor loads and power circuits. It operates on a 110-120V AC coil voltage and features a compact S00 frame size suitable for DIN rail or surface mounting. The unit includes four auxiliary contacts in a 2NO/2NC configuration for control circuit signalling. Screw terminals provide secure wiring connections for power and control circuits.
Suited for standard motor switching up to 16A
This contactor suits panels controlling motors or resistive loads within the 16A inductive and 22A resistive ratings. It is not reversing, so applications requiring forward-reverse operation need a different assembly. The device has no integral enclosure, so installers must provide suitable IP-rated housing. Buyers needing NEMA-rated starters or integrated overload protection should consider alternative product lines.
Coil voltage 110-120V AC defines compatibility
The 110-120V AC coil voltage is the critical specification that determines whether this contactor matches the control circuit supply. Verify the panel control voltage before ordering, as other coil voltages are not interchangeable on this model. The fixed auxiliary contact arrangement of 2NO/2NC also sets the control logic interface. Matching these two parameters ensures correct integration.
Highlights
- IEC-compliant contactor rated for 16 A inductive loads
- 110-120 V AC coil suits standard control circuits
- Four auxiliary contacts (2NO/2NC) simplify wiring
- Screw terminals and DIN-rail mount speed installation
- Compact 4.73 × 1.97 in footprint fits tight panels
Specifications
| Brand | SIEMENS |
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Questions about this item
How can I confirm the SIRIUS 3RT contactor is operating correctly after wiring the 110-120V AC coil?
Apply 110-120V AC to the coil; the main 3-pole circuit should close and the integrated 2NO/2NC auxiliary contacts must change state, measurable with a multimeter across the screw terminals.
What does the 3RT20181AK643MA0 package contain and what must I source separately?
The contactor body with screw terminals and built-in 2NO/2NC auxiliaries is supplied; DIN rail clips are integral, so no extra mounting hardware is included or required.
Which version should I choose for a 16 A inductive load on a 110-120V AC control circuit?
This model is rated 16 A inductive and 22 A resistive at 3 poles with a 110/120V AC coil, matching those exact requirements.
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