The Siemens 3RT1955-5AF318K is a genuine SIRIUS replacement contactor coil designed for compatible 3RT105 and 3RT145 power contactors. It is an AC/DC conventional operating coil for S6-size contactors, providing a practical replacement solution when the existing contactor coil requires servicing or replacement. Siemens lists the corresponding 3RT1955-5AF31 configuration as a withdrawable drive for 3RT105 and 3RT145 contactors with 110–127 V AC/DC operation.
The coil supports AC operation at 50/60 Hz as well as DC operation and uses a standard/economy operating mechanism with screw-terminal connection. It is part of the Siemens SIRIUS range of solenoid coils and spare parts for 3RT1 contactors.
The 3RT1955-5AF318K is suitable for industrial motor control panels, electrical control cabinets, motor starter systems, factory automation, machine control equipment, OEM panels and contactor maintenance applications.
Brand: Siemens
Product Family: SIRIUS
Part Number: 3RT1955-5AF318K
Product Type: Replacement Solenoid Coil
Product Series: 3RT19
Compatible Contactors: 3RT105, 3RT145
Contactor Size: S6
Coil Type: AC/DC Conventional Coil
Rated Control Supply: 110–127 V AC/DC
AC Frequency: 50/60 Hz
Operating Mechanism: Standard / Economy Circuit
Connection Type: Screw Terminal
Design: Withdrawable Drive / Coil
Application: Contactor Coil Replacement
Product Category: Solenoid Coils
Product Lifecycle: Active Product for the corresponding 3RT1955-5AF31 configuration
The Siemens 3RT1955-5AF318K replacement coil can be used for:
Siemens SIRIUS 3RT1 contactors
3RT105 contactors
3RT145 contactors
S6-size contactor assemblies
Industrial motor control panels
Electrical control cabinets
Motor starter systems
Industrial automation systems
Machine control panels
Factory automation equipment
OEM control panels
Contactor maintenance
Electrical equipment refurbishment
Motor-control installations
Industrial switching applications
Genuine Siemens SIRIUS replacement component
Designed for compatible 3RT105 and 3RT145 contactors
Supports 110–127 V AC/DC control supply
Suitable for 50/60 Hz AC operation
Supports DC control operation
Withdrawable coil/drive design
Screw-terminal connection
Designed for S6-size contactors
Useful for contactor repair and maintenance
Helps restore the operating function of a compatible contactor
Can reduce the need to replace the complete contactor
Suitable for industrial automation applications
Suitable for motor-control panels and OEM equipment
The Siemens SIRIUS 3RT1955-5AF318K is designed as a replacement operating coil for compatible 3RT105 and 3RT145 S6-size contactors. Siemens specifies the corresponding 3RT1955-5AF31 configuration for 110–127 V AC/DC, with AC operation at 50–60 Hz, a standard/economy operating mechanism and screw-terminal connection.
Its withdrawable design makes it suitable for maintenance and replacement applications where the existing compatible contactor assembly remains serviceable but its operating coil requires replacement.
This Siemens replacement coil is particularly useful in industrial motor control, automation panels, machine control systems, electrical control cabinets, OEM equipment and factory automation applications.
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Q1. What is Siemens 3RT1955-5AF318K?
It is a Siemens SIRIUS AC/DC replacement solenoid coil for compatible 3RT105 and 3RT145 contactors.
Q2. Which contactors are compatible with this coil?
The corresponding 3RT1955-5AF31 configuration is designed for 3RT105 and 3RT145 contactors.
Q3. What is the rated coil voltage?
The specified rated control supply is 110–127 V AC/DC.
Q4. Can this coil operate on both AC and DC?
Yes. It is specified as an AC/DC conventional operating coil.
Q5. What AC frequency does it support?
The AC operating frequency is 50/60 Hz.
Q6. What contactor size is supported?
The coil is intended for S6-size contactor applications.
Q7. What type of connection does it use?
The corresponding 3RT1955-5AF31 configuration uses a screw-terminal connection.
Q8. Is 3RT1955-5AF318K a complete contactor?
No. It is a replacement operating coil/drive, not a complete power contactor.
Q9. What type of operating mechanism does it have?
It uses a standard/economy operating mechanism for AC/DC operation.
Q10. Is the coil withdrawable?
Yes. Siemens describes the corresponding 3RT1955-5AF31 as a withdrawable drive.
Q11. What is the product family?
It belongs to the Siemens SIRIUS solenoid coil and 3RT19 spare-parts range.
Q12. What is the primary application of this coil?
It is used to replace the operating coil of compatible 3RT105 and 3RT145 power contactors.
Q13. Can it be used in motor-control panels?
Yes. It is suitable for compatible SIRIUS contactors used in industrial motor control and automation systems.
Q14. Is it suitable for contactor maintenance?
Yes. It is designed as a replacement spare component for compatible contactors.
Q15. Does replacing the coil require replacing the complete contactor?
No. Where the existing contactor is compatible and otherwise serviceable, its operating coil can be replaced separately.
Q16. What is an AC/DC conventional coil?
An AC/DC conventional coil is designed to operate from either AC or DC control supply within its specified voltage range.
Q17. Is the 3RT1955-5AF31 configuration an active Siemens product?
Yes. Siemens Industry Mall lists 3RT1955-5AF31 as PM300: Active Product.
Q18. Where is 3RT1955-5AF318K commonly used?
It can be used in industrial motor control panels, automation systems, machine control cabinets, OEM equipment, motor starters and electrical maintenance applications.
Q19. What is the advantage of a withdrawable coil?
It provides a convenient replacement solution for the operating mechanism without unnecessarily replacing the entire compatible contactor assembly.
Q20. Where can I buy Siemens 3RT1955-5AF318K in India?
The Siemens SIRIUS 3RT1955-5AF318K replacement coil can be sourced from industrial electrical and automation suppliers, subject to current stock and availability.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS |
| Model Number | 3RT1955-5AF318K |
| Product Type | AC/DC Conventional Coil (Uc Coil) |
| Function | Contactor Control Coil |
| Coil Type | Conventional AC/DC Coil |
| Compatibility | Siemens SIRIUS Contactors |
| Application | Motor Control & Power Switching |
| Installation Type | Contactor Accessory / Replacement Component |
| Usage | Industrial & Commercial Control Systems |
| Brand | Siemens |
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