Siemens 3RT1955-5NB32 Withdrawable Drive for SIRIUS 3RT105/3RT145 Contactors, Electronic Control UC 21-27.3V, 24V DC, Spring-Type Terminal Original Brand New

Overview: Siemens SIRIUS 3RT1 Withdrawable Electronic Drive (3RT1955-5NB32)

The Siemens 3RT1955-5NB32 is a high-performance withdrawable drive (also commonly referred to as a coil) designed for seamless integration with the SIRIUS 3RT105 and 3RT145 power contactors (Size S6). This sophisticated electronic drive is engineered for reliable operation in both AC (50-60 Hz) and DC control circuits, accepting a universal control supply voltage (Us​) range of 21 V to 27.3 V.

A key feature is its electronic operating mechanism with a dedicated 24V DC PLC input, ensuring direct, reliable control from your programmable logic controller (PLC) or digital control system. The use of robust spring-type terminals (Cage Clamp connections) guarantees a secure, vibration-proof, and maintenance-free connection, significantly simplifying wiring and installation time in demanding industrial environments.

Key Product Information

• Product Number: 3RT1955-5NB32
• Product Type: Withdrawable Drive / Solenoid Coil
• Contactor Compatibility: Siemens SIRIUS 3RT105, 3RT145 (Size S6)
• Operating Mechanism: Electronic with PLC Input
• Control Voltage (Us​) Range: $21$ V to $27.3$ V AC (50/60 Hz) / DC
• PLC Interface Voltage: $24$ V DC
• Terminal Type: Spring-Type Terminal (Cage Clamp)
• System: Siemens SIRIUS Modular System

Benefit

1. Enhanced Reliability & PLC Integration: The electronic operating mechanism and dedicated 24V DC PLC input ensure precise, noise-immune control directly from modern digital automation systems.
2. Universal AC/DC Operation: Flexible control voltage range ($21-27.3V$) allows for use in diverse AC and DC industrial applications, simplifying inventory.
3. Fast & Secure Wiring: Spring-type terminals (Cage Clamp) provide a robust, vibration-proof connection that is significantly faster to wire than traditional screw terminals, reducing installation and maintenance costs.
4. Reduced Downtime: The withdrawable design allows for quick and easy replacement or maintenance of the drive without disturbing the main power wiring of the contactor, ensuring maximum operational uptime.
5. Part of the SIRIUS System: Seamlessly integrates with the high-quality, modular, and globally recognized Siemens SIRIUS control system.

Function

The 3RT1955-5NB32 acts as the solenoid for the $\text{3RT105/3RT145}$ contactor. Upon receiving the $21-27.3V$ control signal (initiated by the $24V$ DC PLC input), it generates the electromagnetic force required to pull in the armature, thereby closing the contactor’s main power contacts to control a motor or load. Its electronic design ensures optimal control performance and low power consumption, especially when interfacing with low-level PLC signals.

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