Siemens SIRIUS 3RT2047-1SB30 Power Contactor, 3-Pole, 110A, 55kW (400V), AC/DC 21-33V Coil, Size S3, F-PLC-IN Original Brand New

Overview

The Siemens SIRIUS 3RT2047-1SB30 Power Contactor is a high-performance, 3-pole switching device specifically engineered for demanding motor switching applications in industrial environments. Part of the reliable SIRIUS 3RT2 family, this contactor is rated for $110\text{A}$ at AC-3e/AC-3 operation and is suitable for motors up to $55\text{kW}$ at $400\text{V}$. Its robust design and high operational ratings make it ideal for integration into motor starters and various industrial control systems.

Key Features and Technical Specification

• Product Number: 3RT2047-1SB30
• Product Brand: Siemens SIRIUS
• Contactor Type: Power Contactor for AC switching (AC-3e/AC-3)
• Operational Current (Ie​): $110\text{A}$ (at $400\text{V},\text{AC-3e/AC-3}$)
• Operational Power: $55\text{kW}$ (at $400\text{V}$)
• Poles: 3-pole
• Control Supply Voltage (Us​): $21-33\text{V}\text{AC/DC}$ at $50/60\text{Hz}$ (Highly flexible voltage range)
• Surge Protection: Integrated Varistor in the coil for reliable transient suppression, enhancing system protection.
• Auxiliary Contacts: $1\text{NC}$ (Normally Closed)
• Terminal Type: Screw Terminal connection for main and auxiliary circuits.
• Size: S3
• PLC Integration Feature: F-PLC-IN (Optimized for interfacing with Fail-Safe PLCs, supporting a lower power consumption interface).

Benefit

1. High Reliability and Durability: Belonging to the SIRIUS family, this contactor offers a long mechanical and electrical service life (typically $10$ million mechanical cycles), ensuring minimal downtime.
2. Flexible Control: The wide-range AC/DC control voltage ($21-33\text{V}$) simplifies ordering and stocking while ensuring compatibility with various control system power supplies.
3. Surge Protection Included: The integrated varistor eliminates the need for external surge suppressors, saving installation time, reducing complexity, and protecting the coil from voltage peaks.
4. Optimized for Automation: The F-PLC-IN feature makes it perfectly suited for modern automation systems, especially when implementing safety circuits or connecting directly to a PLC output.
5. Easy Installation: Features robust screw terminals for secure and straightforward wiring of high-current cables, and a compact size S3 footprint for its power rating.

Function

The Siemens 3RT2047-1SB30 power contactor is primarily used for switching electric motors and heating loads on and off. It acts as an electrically controlled switch, where a low control voltage (21-33V AC/DC) applied to the coil closes the main contacts to supply power to the motor.

The single Normally Closed (1 NC) auxiliary contact provides feedback or interlocking capabilities within the control circuit. The device guarantees the safe and efficient operation of high-power machinery, and its AC-3e rating assures efficiency in modern industrial applications.

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