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.

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Siemens 3RT2018-2BB42 24V DC Coil 1NC Spring Terminal AC-3 16A/7.5kW

Product Positioning

The 3RT2018-2BB42 is a standard contactor in the SIRIUS 3RT20 series S00 frame. The coil designation "B" corresponds to a 24V DC standard coil (without a built-in suppression diode). Compared to the F series with a diode, it is slightly lighter and smaller. The terminals feature a spring-loaded design, and the last digit "42" corresponds to one set of normally closed auxiliary contacts, suitable for fault feedback or interlocking protection circuits. The main circuit has an AC-3 rated current of 16A and a power of 7.5kW (400V). Its standard mechanical life is approximately 30 million cycles. With an electronically optimized auxiliary contact module, the electrical life can be further extended. It is a common basic contactor in production line motor control boxes.

Core Product Advantages and Features

24V DC standard coil

Without a built-in suppression diode, it is suitable for control loops with existing external surge suppression designs, resulting in a more cost-effective solution.

1 set of normally closed auxiliary contacts

It can be used for fault signal feedback or interlocking protection to ensure immediate response when the system malfunctions.

Spring-type terminals

Screwless, quick-connect wiring ensures it won't easily loosen due to vibration during long-term use, saving you time on maintenance.

Can be equipped with electronic auxiliary contacts to upgrade electrical life

With the optional electronically optimized auxiliary switch module, the electrical life can be increased from 10 million cycles to an even higher level.

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	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 0.316 kg
Mechanical life	Approximately 30 million times
Electrical life (standard auxiliary contacts/electronically optimized type)	Approximately 10 million times / Approximately 5 million times
Protection level	IP20 (Front Panel)

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3RT2018-2BB41

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3RT2018-2AP01

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