Siemens 3RT2047-1NB30 SIRIUS Power Contactor S3, 110A, 55kW Original Brand New

Overview

The Siemens 3RT2047-1NB30 is a high-performance, 3-pole power contactor from the modular SIRIUS 3RT2 series, designed for reliably switching electrical loads, particularly motors up to 55 kW at 400 V (AC-3e/AC-3 rated). This robust Size S3 contactor features a wide-range control voltage of 20-33 V AC/DC and comes with an integrated varistor for coil protection, simplifying wiring and enhancing system reliability. Its compact design and high contact reliability make it an essential component in modern industrial motor control applications.

Technical Specification & Features

• Product Number: 3RT2047-1NB30
• Product Series: SIRIUS 3RT2
• Contactor Size: S3
• Poles: 3-pole for main circuit
• Rated Operating Current (AC-3e/AC-3 at 400V): 110 A
• Rated Operational Power (AC-3 at 400V): 55 kW
• Control Supply Voltage (Coil): 20 – 33 V AC/DC (50/60 Hz) – Allows flexible AC or DC control.
• Integrated Protection: Varistor built-in for surge damping and coil protection, reducing wear on control components.
• Auxiliary Contacts: 1 Normally Open (NO) + 1 Normally Closed (NC) included in the basic unit.
• Connection Type: Reliable screw terminals for the main and auxiliary circuits.
• Standards Compliance: IE3/IE4-ready, IEC, UL/CSA approved (check datasheet for full list).

Benefit

1. High Power Density: Delivers up to 55 kW in a compact size S3, saving space in control cabinets.
2. Increased Reliability: Integrated varistor protects the control coil against voltage peaks, extending the life of the contactor and connected components.
3. Global Usability: Wide-range AC/DC coil voltage (20-33V) simplifies stock-keeping and provides flexibility across different control system voltages.
4. Easy Integration: Part of the modular SIRIUS system, allowing for easy, coordinated assembly with other components like overload relays and auxiliary switches.
5. Simplified Wiring: Screw terminals offer a proven, secure connection method for industrial environments.

Function

The Siemens 3RT2047-1NB30 Power Contactor is primarily used for switching and controlling 3-phase electric motors and other resistive or inductive loads. It acts as an electrically controlled switch, opening and closing the main circuit in response to a signal from the control circuit (via the 20-33 V AC/DC coil). The built-in auxiliary contacts provide status feedback and interlocks for the control logic.

Application

Ideal for heavy-duty industrial applications requiring high current and power switching, such as:

• Controlling large three-phase AC motors (Direct On Line (DOL) starting).
• Switching heating, ventilation, and air conditioning (HVAC) systems.
• Integration into complex machinery and plant automation systems.

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