3RT2018-1AN21

The 3RT2018-1AN21 is driven by a 220V AC coil and is equipped with one set of normally open auxiliary contacts for operation status indication. It has an AC-3 rated capacity of 16A/7.5kW/400V, an S00 standard frame, screw terminals, and is compatible with IE3/IE4 motors.

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Siemens 3RT2018-1AN21 Electromagnetic Contactor, 220V AC Coil, 1NO Auxiliary Contact

Product Positioning

The 3RT2018-1AN21 is the most basic normally open auxiliary contact version in the 220V AC coil family. It has a built-in set of NO instantaneous contacts, making it suitable as a "running" indicator light or a source of PLC status feedback signals. It is the most common entry-level model for start-stop control of pumps, fans, and conveyor equipment. The main circuit AC-3 is rated at 7.5kW/400V, 16A, using the S00 standard frame and screw terminal wiring. The supplier's information also indicates compatibility with IE3/IE4 high-efficiency motors and has international universality covering IEC and UL/CSA dual certifications, making it suitable for export machines or unified selection of equipment in multiple regions.

Core Product Advantages and Features

220V AC coil, normally open auxiliary contact

The coil operates at 220V AC, 50/60Hz, and is equipped with one set of normally open (NO) instantaneous auxiliary contacts, making it suitable for operation indication or feedback applications.

IE3/IE4 high-efficiency motor compatibility

The supplier information indicates that it can be used with IE3/IE4 grade high-efficiency motors, which is in line with the trend of the new generation of energy-saving motors.

IEC and UL/CSA dual certification

Compliant with IEC standards and UL/CSA certified, suitable for equipment outputs requiring cross-regional and cross-standard verification.

S00 frame, screw terminals

Standardized installation dimensions and wiring methods facilitate pairing with other thermal overload relays in the same series to form a complete starter.

project	Specification
model	3RT2018-1AN21
coil voltage	220V AC, 50/60Hz
Auxiliary contact	1 NO (Normal Open)
Rated operating current (AC-3)	16 A
Rated power (AC-3, 400V)	7.5 kW
Extreme number	3P
Mounting Frame	S00
Wiring method	Screw terminals
Applicable certification	IEC, UL/CSA
Motor compatibility	IE3/IE4 high-efficiency motor compatibility

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The 3RT2018-1AN22 is a 220V AC coil model, equipped with one set of normally closed auxiliary contacts for fault or shutdown feedback. It has an AC-3 16A/7.5kW rating, an S00 frame, screw terminals, and weighs approximately 0.237 kg. It is one of the 220V options in the same series.

3RT2018-1AF02

The 3RT2018-1AF02 coil has a voltage of 110V AC, a built-in set of normally closed auxiliary contacts, a mechanical life of 30 million cycles, an AC-3 electrical life of 10 million cycles, an AC-3 rated power of 16A/7.5kW, and a weight of approximately 0.232 kg.

3RT2018-1AF01

The 3RT2018-1AF01 features a 110V AC coil and one set of normally open auxiliary contacts. It has a rated insulation voltage of 690V, an impulse withstand voltage of 6kV, IP20 protection, an AC-3 16A/7.5kW rating, and dimensions of only 58×45×73mm, weighing approximately 0.233 kg.