3RT2018-2FB41

Spring terminal S00 contactor, 24V DC coil with built-in diode for suppressing surges, one set of normally open auxiliary contacts for start-up feedback signal, AC-3 rated 16A/7.5kW (400V), storage temperature range -55°C to 80°C.

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Siemens 3RT2018-2FB41 24V DC Built-in Diode Coil 1NO Spring Terminal AC-3 16A/7.5kW

Product Positioning

The 3RT2018-2FB41 is a SIRIUS 3RT20 S00 frame contactor. Compared to the 2FB42 in the same family, the difference lies in the auxiliary contact configuration: the last digit "41" of this model corresponds to one set of normally open auxiliary contacts, suitable for use as a "started" indicator for motor start status signal feedback or interlock control. The coil is also 24V DC and has a built-in suppression diode, which reduces the interference of surges on the control circuit during power failure; the terminals have a spring-loaded design, allowing for quick wiring and vibration resistance. The main circuit is rated AC-3 16A/7.5kW (400V), and the storage temperature range is -55°C to +80°C, making it suitable for harsh warehousing and transportation environments.

Core Product Advantages and Features

1 set of normally open auxiliary contacts

It can serve as a signal feedback indicating that the contactor is engaged, facilitating PLC monitoring of the motor's start-up status.

24V DC with built-in suppression diode coil

When the coil is de-energized, the built-in diode absorbs the back electromotive force surge, protecting nearby electronic control components.

Spring-type terminals

Screwless fastening, high wiring efficiency, and able to withstand significant vibration without easily loosening.

Wide temperature storage design

Storage temperature range is -55°C to +80°C, suitable for long-term storage or transportation environments.

project	Specification
Product Series	SIRIUS 3RT20, frame size S00
Extreme number	3 poles (3 normally open main contacts)
AC-3 Rated Current/Power (400V)	16 A / 7.5 kW
500V AC-3 rated current	12.4 A
690V AC-3 rated current	8.9 A
Coil Specifications	24V DC, built-in suppression diode
Auxiliary contacts	1 normally open (1NO) group
Auxiliary contact rated (AC-15/400V)	3 A
Terminal type	Spring-loaded terminals (main circuit/auxiliary/coil)
External dimensions (height × width × depth)	70 × 45 × 73 mm
net weight	Approximately 0.314 kg
Operating/Storage Temperature Range	-25°C to +60°C / -55°C to +80°C
Mechanical life	Approximately 30 million times
Protection level	IP20 (Front Panel)

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3RT2018-2FB42

S00 frame contactor, spring-loaded terminals for screwless quick-connection, 24V DC coil with built-in suppression diode to reduce power failure surge, equipped with one set of normally closed auxiliary contacts, main circuit AC-3 rated 16A/7.5kW, suitable for motor control and interlocking circuits.

3RT2018-2BB42

S00 miniature contactor, 24V DC standard coil (excluding diode), spring-loaded terminals with one set of normally closed auxiliary contacts, AC-3 rated current 16A, power 7.5kW (400V), optional electronic auxiliary contacts to extend electrical life.

3RT2018-2BB41

S00 frame spring terminal contactor, 24V DC standard coil, one set of normally open auxiliary contacts for start-up feedback, main contacts AC-3 rated 16A/7.5kW (400V), net weight approximately 0.313kg, mechanical life approximately 30 million cycles.