3RT2018-1AD01

The 3RT2018-1AD01 coil has a voltage of only 42V AC, which is a rare low-voltage coil option in the Siemens SIRIUS series. It is equipped with one set of normally open auxiliary contacts, AC-3 rated 16A/7.5kW/400V, S00 frame, screw terminal wiring.

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Siemens 3RT2018-1AD01 Electromagnetic Contactor 42V AC Coil 1NO Auxiliary Contact

Product Positioning

In the Siemens SIRIUS 3RT20 coding convention, the suffix "AD" corresponds to the relatively uncommon low-voltage coil option of 42V AC. 3RT2018-1AD01 is an example of this specification, with both 50Hz and 60Hz power supplies using 42V. Low-voltage coils are commonly found in control circuits where personal safety is emphasized, such as SELV control power supplies supplied by safety isolation transformers, and control panels near damp or metal-cased equipment, reducing the risk of electric shock to the control circuit itself. The auxiliary contacts are configured with one normally open (NO) group, and the main circuit maintains an AC-3 7.5kW/400V, 16A rating. The mounting frame is also S00, using screw terminal wiring, and can be assembled with the same series of standard thermal overload relays to form a complete starting unit.

Core Product Advantages and Features

42V AC low voltage coil

The coil voltage is only 42V AC (50/60Hz), making it suitable for low-voltage control circuits powered by a safety isolation transformer.

1 set of normally open auxiliary contacts

It has a built-in 1NO instantaneous auxiliary contact, which can be used as a feedback signal for operating status or a chain start signal.

The main circuit specifications are consistent with the series.

AC-3 rated 16A/7.5kW (400V), S00 frame, screw terminals, compatible with other coil voltage versions.

Suitable for high-security environments

The low-voltage coil design reduces the risk of electric shock to operators on the control side and is suitable for installation around damp or metal-encased equipment.

project	Specification
model	3RT2018-1AD01
coil voltage	42V 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 circuits	Safety Extra Low Voltage (SELV) Control Circuit

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3RT2018-1AB02

The 3RT2018-1AB02 uses a 24V AC coil, equipped with one set of normally closed auxiliary contacts, rated insulation voltage of 690V, S00 standard frame, AC-3 rated 16A/7.5kW, weighs only about 232.5 grams, and has an operating temperature of -25°C to +60°C.

3RT2018-1AB01

The Siemens SIRIUS 3RT2018-1AB01 is a standard 3-pole electromagnetic contactor with an S00 frame. It has an AC-3 rated capacity of 7.5kW/400V and a rated current of 16A. It uses a 24V AC coil and has a built-in set of normally open auxiliary contacts. The screw terminal design makes it suitable for direct starting circuits of small motors.