3RT2018-1BB41

The 3RT2018-1BB41 uses a 24V DC coil drive and has a built-in set of normally open auxiliary contacts for operation indication or interlock signal output. It has an AC-3 rated capacity of 16A/7.5kW, an S00 frame, screw terminals, and weighs approximately 0.292 kg, making it suitable for small and medium-sized electromechanical panels.

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Siemens 3RT2018-1BB41 Electromagnetic Contactor, 24V DC Coil, 1NO Auxiliary Contact

Product Positioning

The 3RT2018-1BB41 belongs to the SIRIUS 3RT2018 series, specifically the 24V DC coil version. The biggest difference between it and the 1BB42 lies in the auxiliary contact type—this model features one set of normally open (NO) instantaneous contacts, suitable for outputting a "contactor closed" operating status signal or serving as an interlocking start condition for the next stage circuit. The main circuit specifications remain unchanged at AC-3 7.5kW/400V, 16A rating, and it also uses the S00 standard frame and screw terminals, facilitating assembly with thermal overload protection components from the same series to form a complete starter. For automated production lines that have already adopted a 24V DC control architecture and require clear operational feedback, the 1BB41 is a common standard configuration.

Core Product Advantages and Features

24V DC coil, normally open auxiliary contact

The coil is driven by 24V DC and equipped with one set of normally open (NO) instantaneous auxiliary contacts, which are suitable for operation status feedback or interlock start signals.

Shares main circuit specifications with 1BB42

The AC-3 rated 16A/7.5kW (400V) has the same frame size as the S00, allowing for flexible selection based on auxiliary contact requirements.

Screw terminals, DIN rail mounting

Both the main circuit and auxiliary circuit use screw terminals, supporting quick mounting on standard 35mm DIN rails, making maintenance and replacement convenient.

Suitable for DC control panel applications

The 24V DC coil can be directly connected to the PLC output or DC power supply panel, eliminating the need for additional AC/DC conversion components.

project	Specification
model	3RT2018-1BB41
coil voltage	24V DC
Auxiliary contact	1 NO (Normal Open)
Rated operating current (AC-3)	16 A (the catalog may list a maximum of 17 A)
Rated power (AC-3, 400V)	7.5 kW
Extreme number	3P
Mounting Frame	S00 (SIRIUS 3RT20 series)
Wiring method	Screw terminals
weight	Approximately 0.292 kg
Insulation voltage	690V
Installation method	35mm DIN rail/panel
Operating ambient temperature	-25°C ~ +60°C

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