SIEMENS
SIEMENS 3RT20251AK643MA0 IEC Magnetic Contactor 110/120V AC 3P 2NO/2NC
IEC magnetic contactor with 3 poles, 17 A inductive and 40 A resistive ratings, 2 NO/2 NC auxiliary contacts, and 110/120 V AC coil for DIN-rail or surface mounting
- IEC magnetic contactor rated for 110/120V AC coil voltage
- Three-pole design handles 17 A inductive and 40 A resistive loads
- Built-in 2NO/2NC auxiliary contacts simplify control wiring
- Compact 5.87 in height by 2.13 in width fits tight panels
- DIN-rail or surface mounting with screw terminals for secure installation
IEC Magnetic Contactor for Motor Control
This SIEMENS 3RT20251AK643MA0 is a three-pole IEC magnetic contactor rated for 17 A inductive and 40 A resistive loads. It operates on a 110/120V AC coil voltage and includes four auxiliary contacts in a 2NO/2NC configuration. The unit belongs to the SIRIUS 3RT safety contactor series with frame size S0.
Check Coil Voltage and Mounting Compatibility
Verify that your control circuit supplies 110/120V AC to match the coil rating before ordering. Confirm the available DIN rail or surface mounting space accommodates the overall dimensions of 5.87 in height by 2.13 in width. Ensure the screw terminal connections suit your wiring scheme and that a non-reversing contactor meets the application requirements.
Integrates into Panels with DIN Rail Mounting
The contactor mounts on standard DIN rail or directly onto a panel surface, fitting within compact enclosures using its S0 frame dimensions. Screw terminals provide secure connections for both main and auxiliary circuits without specialised tooling. The 2NO/2NC auxiliary block supports interlocking and status feedback, freeing separate relay modules for other functions.
Highlights
- IEC magnetic contactor rated for 110/120V AC coil voltage
- Three-pole design handles 17 A inductive and 40 A resistive loads
- Built-in 2NO/2NC auxiliary contacts simplify control wiring
- Compact 5.87 in height by 2.13 in width fits tight panels
- DIN-rail or surface mounting with screw terminals for secure installation
Specifications
| Brand | SIEMENS |
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Questions about this item
What comes in the box and what must be purchased separately for the SIEMENS 3RT20251AK643MA0 contactor?
The contactor itself is supplied with 2NO/2NC auxiliary contacts and screw terminals. DIN rail clips, wiring, fuses, overload relays and enclosures are not included and must be sourced separately.
How do I choose between the 110 V AC and 120 V AC coil ratings for this contactor?
The coil is rated for a continuous 110/120 V AC range, so a single version covers both voltages. Select this model when your control circuit operates anywhere within that range.
What does the 17 A inductive current rating mean when the contactor is installed in a motor circuit?
It indicates the maximum full-load inductive current the main poles can switch reliably at 110/120 V AC coil voltage. Motor loads must not exceed 17 A; resistive loads may go up to 40 A.
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