The Siemens 3RT1955-5AP318K is a genuine SIRIUS replacement solenoid coil designed for compatible 3RT105 and 3RT145 power contactors. It is a withdrawable AC/DC conventional coil with a standard/economy operating mechanism and screw-terminal connection, making it suitable for replacing the operating coil in compatible Siemens SIRIUS contactors. Siemens identifies the 3RT1955-5AP31 series as a standard operating mechanism for AC/DC applications.
The coil is designed for 220–240 V AC/DC control supply, with AC operation at 50/60 Hz. It is intended for S6-size 3RT105 and 3RT145 contactors and is part of the Siemens 3RT19 spare-parts and accessories range. Siemens lists the corresponding 3RT1955-5AP31 as an Active Product.
This Siemens SIRIUS replacement coil is suitable for industrial motor control panels, electrical control cabinets, motor starter systems, factory automation, machine control systems, OEM panels and contactor maintenance applications where an existing contactor coil needs replacement.
Brand: Siemens
Product Family: SIRIUS
Part Number: 3RT1955-5AP318K
Product Type: Replacement Solenoid Coil
Series: 3RT19
Compatible Contactors: 3RT105, 3RT145
Contactor Size: S6
Coil Type: AC/DC Conventional Coil
Operating Mechanism: Standard / Economy Circuit
Rated Control Supply: 220–240 V AC/DC
AC Frequency: 50/60 Hz
Connection Type: Screw Terminal
Design: Withdrawable Coil
Application: Contactor Coil Replacement
Product Category: Solenoid Coils
Product Status: Active Product for the corresponding 3RT1955-5AP31 configuration
The Siemens 3RT1955-5AP318K replacement coil is suitable for:
Siemens SIRIUS power 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 electrical panels
Contactor maintenance
Electrical equipment refurbishment
Motor-control applications
Industrial switching systems
Genuine Siemens SIRIUS replacement component
Designed for compatible 3RT105 and 3RT145 contactors
Supports 220–240 V AC/DC control supply
Suitable for 50/60 Hz AC operation
Withdrawable coil design
Screw-terminal connection
Suitable for S6-size contactors
Useful for contactor repair and maintenance
Helps restore the operating function of a compatible contactor
Avoids unnecessary replacement of the complete contactor
Suitable for industrial automation and motor-control applications
Designed according to the Siemens SIRIUS spare-part system
The Siemens SIRIUS 3RT1955-5AP318K is designed as a replacement operating coil for compatible 3RT105 and 3RT145 S6-size contactors. The 3RT1955-5AP31 configuration is specified by Siemens as a withdrawable standard operating mechanism for AC/DC operation, with a screw-terminal connection and 220–240 V AC/DC control voltage.
Using a dedicated replacement coil can be a practical solution when the existing contactor mechanism requires coil replacement while the remaining contactor assembly is serviceable. This makes the component useful for industrial electrical maintenance, motor control, automation panels, OEM equipment and machine-control systems.
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Q1. What is Siemens 3RT1955-5AP318K?
It is a Siemens SIRIUS replacement solenoid coil for compatible 3RT105/3RT145 contactors.
Q2. Which contactors are compatible with this coil?
The corresponding 3RT1955-5AP31 coil is specified for 3RT105 and 3RT145 contactors.
Q3. What is the coil voltage?
The rated control supply is 220–240 V AC/DC.
Q4. Can it operate on both AC and DC?
Yes. It is specified as an AC/DC conventional coil.
Q5. What AC frequency does it support?
The specified AC operating frequency is 50/60 Hz.
Q6. What is the contactor size?
The replacement coil is designed for S6-size contactor applications.
Q7. What type of connection does it use?
The coil uses screw terminals.
Q8. Is this a complete power contactor?
No. It is a replacement operating coil, supplied as a spare part for compatible contactors.
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 classifies the corresponding 3RT1955-5AP31 component as a withdrawable drive/coil.
Q11. What is the product family?
It belongs to the Siemens SIRIUS 3RT19 range of spare parts and accessories.
Q12. What is the main application of this coil?
It is used to replace the operating coil of compatible 3RT105 and 3RT145 power contactors.
Q13. Can this coil be used for motor-control panels?
Yes. Compatible SIRIUS contactors are widely used in motor control, industrial automation and electrical control panels.
Q14. Is it suitable for contactor maintenance?
Yes. It is intended as a replacement spare part for compatible SIRIUS contactors.
Q15. Does replacing the coil mean replacing the complete contactor?
No. If the contactor assembly is otherwise serviceable and compatible, the operating coil can be replaced as a spare component.
Q16. What is the difference between AC-only and AC/DC conventional coils?
The AC/DC conventional coil is designed to operate from either AC or DC control supply within its specified voltage range.
Q17. Is 3RT1955-5AP31 an active Siemens product?
Yes. Siemens Industry Mall currently lists the corresponding 3RT1955-5AP31 configuration as PM300: Active Product.
Q18. Where is Siemens 3RT1955-5AP318K 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 replacement coil?
It allows the operating coil/drive mechanism to be replaced without unnecessarily replacing the entire compatible contactor assembly.
Q20. Where can I buy Siemens 3RT1955-5AP318K in India?
The Siemens SIRIUS 3RT1955-5AP318K replacement coil can be sourced from industrial electrical and automation suppliers such as SB Smart, subject to current stock and availability.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS |
| Model Number | 3RT1955-5AP318K |
| 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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