SIEMENS
SIEMENS 3RT20251AN20 contactor 1NC/1NO 208V AC 3-pole
IEC magnetic contactor with 1NO/1NC auxiliary contacts, 3-pole switching at 208 V AC, 17 A inductive and 40 A resistive load, DIN-rail or surface mount
- IEC magnetic contactor rated 208 V AC coil
- 3-pole power switching for motor loads up to 17 A inductive
- Auxiliary contacts 1 NO and 1 NC for control circuits
- Screw-terminal connections on DIN-rail or surface mount
- SIRIUS 3RT20 series frame S0 measures 3.65 in high × 3.4 in wide
IEC Contactor for Motor Control
The SIEMENS 3RT20251AN20 is a three-pole IEC magnetic contactor built for switching inductive loads up to 17 A and resistive loads up to 40 A. It suits control panels, motor starters and machinery circuits that require a compact, DIN-rail mountable device.
Screw Terminals and DIN Rail Mounting
The unit uses screw terminals for secure wiring and fits on DIN rails or surface mounts without an enclosure. Its 3.4 in width and 3.65 in height keep the footprint small, freeing panel space for additional relays, timers or overload relays in the same assembly.
208 V AC Coil with Low Holding Power
The 208 V AC coil draws minimal power once pulled in, keeping heat rise low inside the cabinet. Non-reversing operation and the 1NO/1NC auxiliary block simplify control wiring while the open frame design allows unrestricted airflow around the contacts.
Highlights
- IEC magnetic contactor rated 208 V AC coil
- 3-pole power switching for motor loads up to 17 A inductive
- Auxiliary contacts 1 NO and 1 NC for control circuits
- Screw-terminal connections on DIN-rail or surface mount
- SIRIUS 3RT20 series frame S0 measures 3.65 in high × 3.4 in wide
Specifications
| Brand | SIEMENS |
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Questions about this item
How much inductive current can the 3RT20251AN20 handle continuously before thermal limits become a concern?
The contactor is rated for 17 A inductive full-load current, which sets the practical thermal boundary during sustained operation.
What heat or noise should I expect when the 208 V AC coil is energised all day on a DIN-rail mount?
The IEC-sized S0 frame with screw terminals runs silently; only the coil draws power, so warmth stays modest and there is no fan noise.
Which auxiliary-circuit components must already be wired for the 1NO/1NC contacts to function?
You need a compatible 208 V AC control circuit and screw-terminal wiring to the two built-in auxiliary contacts (1 NO, 1 NC).
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