Siemens 3RT1955-5NF31 Withdrawable Electronic Drive Coil for 3RT1 Contactor, 96-127V AC/DC Original Brand New

Overview

The Siemens 3RT1955-5NF31 is a high-performance, withdrawable electronic drive (solenoid coil) designed as a key component for SIRIUS 3RT105 and 3RT145 power contactors (typically Size S6). This sophisticated drive mechanism is engineered for reliable and efficient switching operations in demanding industrial automation and control applications. As an AC/DC changeover operating mechanism, it provides flexible power supply options.

Key Features and Technical Specification

• Product Type: Withdrawable Drive / Solenoid Coil / Electronic Operating Mechanism
• Compatibility: Designed for Siemens SIRIUS Power Contactors 3RT105 and 3RT145 (Size S6)
• Control Supply Voltage (Us​): $96\dots 127\text{V}$ AC ($50/60\text{Hz}$) / DC
• Operating Mechanism: Electronic with reduced holding power for energy efficiency.
• Control Interface: Integrated PLC Input $24\text{V}$ DC for direct and easy connection to programmable logic controllers.
• Connection Type: Reliable Screw Terminal connection.
• Function: Changeover operating mechanism.
• Product Series: SIRIUS 3RT19

Benefit

• Enhanced Reliability: Electronic operation offers superior consistency and longevity compared to standard coils.
• PLC Integration: The dedicated $24\text{V}$ DC PLC input simplifies wiring and direct control from a Programmable Logic Controller, reducing the need for intermediate relays.
• Energy Efficiency: The electronic operating mechanism is designed with an inherent power reduction feature, minimizing holding power consumption and heat generation once the contactor is closed.
• Versatile Power: Compatible with a wide voltage range of $96\text{V}$ to $127\text{V}$ for both AC ($50\text{Hz}/60\text{Hz}$) and DC control power applications.
• Easy Maintenance: The withdrawable design allows for quick and tool-free coil replacement, minimizing downtime for maintenance.

Function

The 3RT1955-5NF31 acts as the core actuating component (the coil) within the 3RT105 and 3RT145 contactors. When the specified control voltage ($96\dots 127\text{V}$ AC/DC) is applied, the coil energizes, generating the magnetic force required to close the main contacts of the contactor, thus controlling the flow of high-power current to the load (e.g., a motor). The electronic mechanism manages the current draw, ensuring a strong initial pull-in and then reducing the holding current to save energy. The $24\text{V}$ DC PLC input facilitates precise, low-power switching signals from a central control system.

Application

Ideal for use in industrial control systems, machinery, and electrical panels where:

• Reliable control of 3RT105/3RT145 power contactors is required.
• Control power is supplied via a wide $96\text{V}$ to $127\text{V}$ AC or DC source.
• Direct and efficient interfacing with $24\text{V}$ DC PLC outputs is necessary.
• Energy savings and reduced heat dissipation are priorities.

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