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.

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Siemens 3RT2018-2BB41 24V DC Coil 1NO Spring Terminal AC-3 16A/7.5kW

Product Positioning

The 3RT2018-2BB41 is a basic model of the SIRIUS 3RT20 S00 frame contactor. It features a standard 24V DC coil (without a built-in diode) and spring-loaded terminals. The last digit "41" corresponds to one set of normally open auxiliary contacts. It is commonly used for motor start-up feedback or as a source of operation indication signals. The main circuit has a rated current of 16A and a rated current of 7.5kW (400V) for AC-3, with a mechanical life of approximately 30 million cycles. The auxiliary contacts have a rated current of up to 10A (AC-12), and reliability is as high as approximately one false trip per 100 million cycles. It is a common standard configuration in three-phase non-reversible motor control circuits.

Core Product Advantages and Features

24V DC standard coil

With no built-in diode, its compact size makes it suitable for general control applications that require external protection circuits.

1 set of normally open auxiliary contacts

It can be used as a signal feedback for motor starting or contactor engagement status, facilitating integration with monitoring systems.

Spring-type terminals

Screwless fastening, quick and secure wiring, suitable for large-scale installation of control box production lines.

High auxiliary contact reliability

The auxiliary contact has a reliable operation with only about one malfunction per 100 million operations, and excellent signal feedback stability.

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 standard coil
Coil operating voltage range	0.8 ~ 1.1 × rated voltage
Auxiliary contacts	1 normally open (1NO) group
Auxiliary contact rated current (AC-12)	10 A
Terminal type	Spring-loaded terminals (main circuit/auxiliary/coil)
External dimensions (height × width × depth)	70 × 45 × 73 mm
net weight	Approximately 0.313 kg
Mechanical life	Approximately 30 million times
Protection level	IP20 (Front Panel)

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