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.

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

Product Positioning

The 3RT2018-1FB41 is the screw terminal version of the SIRIUS 3RT20 S00 frame contactor. It features a 24V DC coil with a built-in suppression diode, making it suitable for applications requiring surge suppression in DC control circuits. The last digit "41" corresponds to one set of normally open auxiliary contacts, which can be used as a signal feedback source for motor starting. The main circuit AC-3 is rated at 16A, 7.5kW (400V), with dimensions of approximately 50×61.5×77.5mm and a net weight of approximately 0.295kg. The terminals can accept 0.5 to 4mm² solid or stranded conductors, making it a common screw terminal type in traditional switchboard installations.

Core Product Advantages and Features

Screw terminal design

Traditional torque-locking wiring methods are suitable for distribution panel sites where existing construction specifications require screw terminals.

24V DC with built-in suppression diode coil

Effectively absorbs surge waves during coil de-energization, reducing interference to other components in the control circuit.

1 set of normally open auxiliary contacts

It can be used for motor start-up or contactor engagement status signal feedback, facilitating PLC monitoring.

Standardized external dimensions

Approximately 50×61.5×77.5mm in size and weighing approximately 0.295kg, these dimensions are consistent with the screw terminal models in the same series, facilitating panel design adoption.

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	Screw terminals (main circuit/auxiliary/coil)
Available wire diameter	0.5 ~ 4 mm² (solid/stranded wire)
External dimensions	Approximately 50 × 61.5 × 77.5 mm
net weight	Approximately 0.295 kg
Mechanical life	Approximately 30 million times
Protection level	IP20 (Front Panel)

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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).

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.

3RT2018-1AP01

The Siemens 3RT2018-1AP01 features a 230V AC coil design, allowing it to be powered directly from the main power supply without the need for a separate 24V control power supply. It has a built-in set of normally open auxiliary contacts, AC-3 16A/7.5kW, an S00 frame, and an overall size of only 45×58×73mm.