Siemens 3RT2047-1AF00 SIRIUS Power Contactor, 110A, 55kW/400V, AC-3/AC-3e, 110V AC Coil, Size S3 Original Brand New

Overview

The Siemens 3RT2047-1AF00 is a high-performance, 3-pole SIRIUS 3RT2 series power contactor designed for reliably switching motors and general industrial loads. This robust component is a core part of the modular SIRIUS system, offering a compact design and high contact reliability for demanding applications.

Rated for a massive 110 A (AC-3/AC-3e) and capable of switching motors up to 55 kW at 400 V, this contactor is ideal for heavy-duty low-voltage industrial control. It features a control coil voltage of 110 V AC at 50 Hz and comes equipped with an integrated 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for seamless integration into control circuits. The use of screw terminals ensures a secure and maintenance-friendly electrical connection for all main and auxiliary circuits.

Benefits & Advantages

• High Performance in a Compact Design: The SIRIUS 3RT2 series maintains high contact reliability while offering excellent performance for its small size (Size S3).
• IE3/IE4 Ready: Fully compliant for use with high-efficiency IE3 and IE4 motors, ensuring future-proof motor control solutions.
• Global Standard Compliant: Approved for worldwide use (e.g., IEC and UL/CSA), making it suitable for international machine building and panel construction.
• Reduced Wiring Complexity: Integrated auxiliary contacts (1 NO + 1 NC) simplify wiring and reduce the need for external components.
• Robust Connection: Secure screw terminals provide a reliable, long-lasting connection in vibration-prone industrial environments.
• Modular System: Part of the comprehensive SIRIUS modular system, allowing easy combination with other coordinated products like overload relays and circuit breakers.

Function

The Siemens 3RT2047-1AF00 acts as an electrically controlled switch, primarily used to safely and remotely start, stop, and control 3-phase AC induction motors.

1. Motor Switching (Main Circuit): When the 110V AC coil is energized, it closes the three main power poles, allowing the 110A / 55kW motor load current to flow. When the coil is de-energized, the poles open, cutting off power to the motor.
2. Signal Integration (Auxiliary Circuit): The integrated 1 NO and 1 NC auxiliary contacts change state with the main contacts, providing crucial feedback to the PLC or control system (e.g., “contactor is closed” or “contactor is open” status) and enabling interlocking functions.

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