3RT2018-1FB42

S00 frame screw terminal contactor, 24V DC coil with built-in suppression diode to reduce power failure surge, 1 set of normally closed auxiliary contacts suitable for interlock protection circuits, main circuit AC-3 rated 16A, power 7.5kW (400V).

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

Product Positioning

The 3RT2018-1FB42 is a SIRIUS 3RT20 S00 frame contactor. The "1" in the model number indicates a traditional screw terminal design, allowing maintenance personnel accustomed to tightening wiring with a torque screwdriver to maintain their existing work habits. The "F" corresponds to a 24V DC coil with a built-in suppression diode, capable of absorbing back EMF surges when the coil is de-energized. The last digit, "42," corresponds to one set of normally closed auxiliary contacts, suitable for fault signal feedback or interlocking protection circuits. The main circuit AC-3 is rated at 16A, 7.5kW (400V), sharing the same main circuit and coil specifications as the spring terminal model 2FB42 in the same series, differing only in terminal wiring, allowing for flexible selection based on site conditions.

Core Product Advantages and Features

Screw terminal design

It uses the traditional screw-locking wiring method, which is suitable for maintenance and installation personnel who are used to using torque screwdrivers.

24V DC with built-in suppression diode coil

The built-in diode absorbs the surge when the coil is de-energized, protecting the electronic components in the control circuit.

1 set of normally closed auxiliary contacts

It can be used for fault feedback or interlocking protection to ensure that abnormal conditions are immediately reflected in the control system.

Shares main circuit specifications with spring terminal model

The main circuit and coil specifications are the same as those of the 2FB42, only the terminal type is different, allowing for flexible selection based on construction habits.

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	Screw terminals (main circuit/auxiliary/coil)
Available wire diameter	0.5 ~ 4 mm² (solid/stranded wire)
External dimensions (approx.)	50 × 61.5 × 77.5 mm
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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3RT2018-1FB41

S00 frame screw terminal contactor, 24V DC coil with built-in suppressed diode, one set of normally open auxiliary contacts for start feedback signal, main contacts AC-3 rated 16A, power 7.5kW (400V), net weight approximately 0.295kg.

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.