Siemens 3RT1966-5NB31 Changeover Operating Mechanism 21-27.3 V AC/DC, 24 V DC PLC Input Original Brand New

Overview

The Siemens 3RT1966-5NB31 is a high-quality changeover operating mechanism (coil) designed for use with the Siemens Sirius vacuum contactor 3RT126. It supports both AC and DC operation (50-60 Hz) within a control voltage range of 21-27.3 V UC, and features an electronic drive mechanism with a PLC-compatible input at 24 V DC. The terminal connection is via screw terminals, ensuring secure installation.

As part of the Siemens SIRIUS series, this accessory is built to integrate seamlessly into industrial control panels and automation systems.

Key Features & Function

• Universal AC/DC control voltage: 21-27.3 V UC (for both 50Hz and 60Hz operation) for versatile deployment.

• Electronic drive mechanism with PLC input: 24 V DC, enabling direct integration with programmable logic controllers.

• Screw-terminal connection for reliable and secure installation in demanding industrial environments.

• Specifically designed for vacuum contactor size S10 and compatible with the Siemens 3RT126 series.

• German-origin manufacturing, RoHS-compliant, precision engineered for industrial use.

Benefit

• Simplifies retrofitting and maintenance: As a drop-in coil replacement, it reduces downtime and ensures continuity of operations.

• Reliable switching performance: The AC/DC capability ensures system resilience regardless of the control supply type.

• PLC-ready connectivity: The 24 V DC input allows direct interfacing with control systems, reducing wiring complexity and enhancing automation.

• Durable build: Engineered for high-demand industrial environments, offering long-term reliability and minimal maintenance.

• Enhanced system compatibility: Perfectly suited for systems that already use the Siemens SIRIUS / 3RT series contactors, ensuring smooth integration.

Application

• Vacuum contactor assemblies in industrial automation

• Control panels and switchgear for motors, drives, and heavy machinery

• PLC-driven systems requiring robust changeover coils

• Retrofitting older vacuum contactor installations with modern electronic drive components

Technical Specification

• Model: Siemens 3RT1966-5NB31

• Control supply voltage (Us): AC/DC 21-27.3 V UC (50/60Hz)

• Drive type: Electronic, with PLC input 24 V DC

• Connection type: Screw terminal

• Compatible with: Siemens vacuum contactor 3RT126, size S10

• Country of origin: Germany

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