3RT20172BB443MA0

The Siemens SIRIUS 3RT2017-2BB44-3MA0 is a reversible (forward and reverse rotation) electromagnetic contactor with an AC-3 rated capacity of 12A, 5.5kW/400V, and a 24V DC coil. It has four sets of auxiliary contacts (2NO+2NC), spring terminals with IP20 protection, and has obtained multiple international certifications including CCC, CSA, EAC, and UL.

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Siemens 3RT2017-2BB44-3MA0 Reversible Contactor AC-3 12A 5.5kW 2NO2NC 24V DC

Product Positioning

The 3RT2017-2BB44-3MA0 is a model in the S00 frame 3RT2017 series specifically designed for forward and reverse (reversible) control. Its AC-3 rating is the same as other members of the family: 12A, 5.5kW/400V. However, its auxiliary contact configuration has been significantly improved, featuring 2 normally open and 2 normally closed (2NO+2NC) contacts for a total of 4 sets. This directly supports mechanical interlocking and signal feedback requirements, saving space compared to external auxiliary contact modules. The coil operates at 24V DC, and the main circuit uses spring terminals and snap-on mounting. Its dimensions are 70x45x121mm, with an IP20 protection rating. It also holds multiple international safety certifications including CCC, CSA, EAC, and UL, making it suitable for machines or distribution boxes exported to multiple markets.

Core Product Advantages and Features

Built-in 2NO+2NC four sets of auxiliary contacts

It integrates 4 sets of auxiliary contacts, which are suitable for forward and reverse interlocking circuits or applications that require more feedback signals, eliminating the hassle of installing external auxiliary contact modules.

24V DC coil, spring terminal

The coil is 24V DC, the main circuit uses spring terminals and supports snap-fit installation, and the wiring and disassembly efficiency is high.

IP20 protection, wide temperature range -25~+60°C

It has an IP20 basic protection rating and can operate stably in a temperature range of -25°C to +60°C.

CCC, CSA, EAC, UL multi-country certifications

It has obtained multiple safety certifications from China, North America, and the Eurasian Economic Union, making it suitable for export-oriented equipment.

project	Specification
Model (MLFB)	3RT2017-2BB44-3MA0
Casing size	S00
Extreme number	3 poles
AC-3 rated current	12 A
AC-3 rated power	5.5 kW
Rated voltage of contacts	690V
coil voltage	24V DC
auxiliary contacts	Built-in 4 groups (2 NO + 2 NC)
Terminal type	Spring terminals
Installation method	Snap-On
External dimensions (height x width x depth)	70 x 45 x 121 mm
Protection level	IP20
Operating temperature range	-25°C ~ +60°C
Certification	CCC, CSA, EAC, UL
country of origin	Germany

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3RT20171BB443MA0

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