Siemens 3RT1955-5AU32 SIRIUS Contactor Withdrawable Drive, 240-277V AC/DC, Spring-Type Terminal Original Brand New

Product Overview

The Siemens 3RT1955-5AU32 is a high-performance, withdrawable operating drive designed for seamless integration with SIRIUS 3RT105 and 3RT145 power contactors. This critical component serves as the coil/solenoid for the contactor, featuring a universal control supply voltage (UC) of 240-277V for both alternating current (AC 50/60 Hz) and direct current (DC) operation. Engineered with a Standard/Economy circuit and Spring-Type terminals, the 3RT1955-5AU32 ensures reliable, energy-efficient, and vibration-proof performance in industrial control systems.

Key Benefit

• Universal Compatibility (UC 240-277V): Simplifies stocking and application by operating on a wide voltage range for both AC (50/60 Hz) and DC control circuits.
• Energy Efficiency: The integrated Economy Circuit reduces holding power consumption once the contactor is engaged, minimizing heat generation and lowering operating costs.
• Rapid & Secure Wiring: Spring-Type (Cage Clamp) terminals provide a quick, reliable, and maintenance-free connection that is highly resistant to vibration, eliminating the need for periodic re-tightening.
• Simplified Maintenance: The withdrawable design allows for easy, tool-free replacement of the drive mechanism, minimizing downtime for your contactor system.
• Designed for SIRIUS: Part of the highly reliable Siemens SIRIUS modular system, ensuring optimal performance and compatibility with 3RT105 and 3RT145 contactors.

Functionality

The 3RT1955-5AU32 acts as the core electromechanical actuator for the compatible contactor. It performs two main functions:

1. Standard Circuit (Pull-in): Supplies the necessary initial power to quickly and reliably close the main contacts of the 3RT105 or 3RT145 contactor.
2. Economy Circuit (Holding): Automatically switches to a reduced power mode after the contactor has closed, which is sufficient to keep the contacts engaged, resulting in significant energy savings and reduced coil temperature.

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