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.

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Siemens 3RT2018-2FB42 24V DC Built-in Diode Coil 1NC Spring Terminal AC-3 16A/7.5kW

Product Positioning

The 3RT2018-2FB42 belongs to the SIRIUS 3RT20 series S00 frame miniature contactor. The "2" in the model number indicates a spring-loaded (screwless) terminal design, and "F" indicates a 24V DC coil with a built-in suppression diode, which absorbs back EMF surges when the coil is de-energized, protecting relays, PLC outputs, and other electronic components in the control circuit. The last digit "42" corresponds to one set of normally closed auxiliary contacts, which can be used for fault feedback, interlocking protection, and other applications. The main circuit maintains an AC-3 rated capacity of 16A/7.5kW (400V), with a mechanical life of up to 30 million cycles, making it suitable for direct starting control of small to medium-sized three-phase motors.

Core Product Advantages and Features

24V DC with built-in suppression diode coil

The built-in diode absorbs the surge when the coil is de-energized, protecting electronic components such as PLC outputs and relays in the control circuit.

Spring-loaded terminal quick-connect

Screwless fastening and spring-loaded wiring ensure high installation efficiency and prevent loosening due to vibration during long-term use.

1 set of normally closed auxiliary contacts

Provides signal feedback or interlock protection, facilitating integration into motor protection and monitoring circuits.

S00 miniaturized design

Compact size and 35 mm DIN rail mounting make it suitable for control box applications with limited panel space.

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	Group 1 normally closed (1NC)
Terminal type	Spring-loaded terminals (main circuit/auxiliary/coil)
External dimensions (height × width × depth)	70 × 45 × 73 mm
net weight	Approximately 0.317 kg
Operating temperature range	-25°C ~ +60°C
Mechanical life	Approximately 30 million times
Electrical life (AC-3, standard auxiliary contacts)	Approximately 10 million times
Protection level	IP20 (Front Panel)
Installation method	35 mm DIN rail

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3RT2018-2FB41

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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.