3RT1955-5AR31

The 3RT1955-5AR31 is a removable coil operating mechanism for the S6 frame 3RT105/3RT145 contactor. It is rated for 440-480V AC/DC universal, with a holding power of 5.8VA, screw terminals, and a standard power-saving circuit design.

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Siemens 3RT1955-5AR31 Contactor with Removable Coil Operating Mechanism 440-480V AC/DC

Product Positioning

The 3RT1955-5AR31 is a replaceable coil operating mechanism used in Siemens SIRIUS series large power contactors 3RT105 and 3RT145 (S6 frame), commonly referred to in the industry as the "Wechselantrieb" replaceable drive coil. When the contactor needs maintenance in the field due to coil aging, burnout, or changes in voltage requirements, users can directly replace this coil module without replacing the entire large contactor body, significantly reducing spare parts costs and downtime. This product has a rated voltage of 440-480V and supports both AC 50/60Hz and DC operation. It adopts a standard economy circuit design, with lower power consumption during the holding phase, making it suitable for motor control circuits and switchboard applications that operate for extended periods.

Core Product Advantages and Features

Replaceable coil design

With a detachable operating mechanism, only the coil module needs to be replaced in case of failure, instead of replacing the entire S6 frame contactor, resulting in higher maintenance efficiency.

440-480V AC/DC universal

Rated voltage covers 440-480V, and it supports AC 50/60Hz and DC operation, adapting to different power grid environments in Europe, North America and other regions.

Standard power-saving circuit

It adopts an economy circuit energy-saving design with a holding power of only 5.8VA, which is more energy-efficient and generates less heat than traditional full-power coils.

Screw terminal wiring

Using screw terminals ensures stable and reliable wiring, making it suitable for long-term use in industrial distribution boxes.

project	Specification
Product Type	Replaceable coil operating mechanism for contactors (incomplete contactor)
Applicable contactors	SIRIUS 3RT105 and 3RT145 series (S6 frame), including models such as 3RT1054-6AR36, 3RT1055-6AR36, and 3RT1056-6AR36.
Rated operating voltage	AC 440-480V(50/60Hz)/DC 440-480V
Holding Power	5.8 VA (Exchange)
Pick-up Power	300 VA (AC)
Power factor	Attraction 0.9 / Retention 0.8
Operating mechanism type	Standard, energy-saving type (Sparschaltung)
Terminal type	Screw terminals
net weight	Approximately 0.6 kg
brand	Siemens SIRIUS
Place of origin	Germany
Applicable product lines	3RA19, 3RH19, 3RT19 series low-voltage control and distribution accessories

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3RT1955-5NB31

The Siemens SIRIUS S6 frame large contactor operating coil, rated voltage 21~27.3V AC/DC universal, screw terminal wiring, is a commonly used replacement coil specification when the 3RT105 and 3RT145 series contactors are paired with a 24V control power supply.

3RT1955-5AP32

The 3RT1955-5AP32 belongs to the S6 frame 3RT105/3RT145 contactor with a removable coil operating mechanism. Verification data shows it operates on approximately 220V AC/DC, similar to but not identical to the 5AP31 (220-240V).

3RT1955-5AP31

The 3RT1955-5AP31 is a removable coil operating mechanism for the S6 frame 3RT105/3RT145 contactor. It is rated for 220-240V AC/DC universal, weighs approximately 0.546 kg, and has obtained multiple certifications including CSA, UL, EAC, and RCM.