Siemens SIRIUS 3RT1056-6NB36 Power Contactor 185A, 90kW, 21-27.3V AC/DC, 3-Pole Original Brand New

Overview

The Siemens 3RT1056-6NB36 SIRIUS power contactor is a high-performance, 3-pole switching device engineered for reliable motor control in industrial applications. Designed for the modular SIRIUS system, this contactor is rated for heavy-duty use with an AC-3e/AC-3 operational current of 185 A and a power rating of 90 kW at 400 V. It features an advanced electronic drive with a flexible control voltage range of 21-27.3 V AC (50/60 Hz) / DC and a dedicated 24 V DC PLC input, ensuring seamless integration into modern automation systems.

Key Features & Technical Specification

• Product Number: 3RT1056-6NB36
• Manufacturer: Siemens
• Series: SIRIUS 3RT1
• Operational Current (AC-3e/AC-3): 185 A
• Operational Power (AC-3): 90 kW at 400 V
• Number of Poles: 3-pole
• Control Voltage (Uc): 21-27.3 V AC (50-60 Hz) / DC
• Drive Type: Electronic drive with 24 V DC PLC input
• Auxiliary Contacts: 2 NO (Normally Open) + 2 NC (Normally Closed)
• Main Circuit Connection: Busbar connection
• Control/Auxiliary Circuit Connection: Screw terminal
• Size: S6

Benefit

• Optimized Automation Integration: The electronic drive with a wide 21-27.3V AC/DC control voltage and direct 24 V DC PLC input simplifies wiring and ensures precise, reliable switching in modern PLC-controlled systems.
• High Power Efficiency & Reliability: With an AC-3e/AC-3 rating of 185 A and 90 kW, this contactor is built for demanding motor-switching tasks, ensuring long-term operational stability and compliance with IE3/IE4 efficiency standards.
• Simplified Main Circuit Wiring: The robust busbar connection for the main circuit provides a secure and efficient high-current connection, reducing installation time and complexity in control cabinets.
• Integrated Monitoring & Control: Pre-installed 2 NO + 2 NC auxiliary contacts offer immediate feedback and flexibility for control and signaling circuits using easy-to-use screw terminals.
• Global Standard Compliance: As part of the Siemens SIRIUS modular system, the 3RT1056-6NB36 meets international approvals (IEC, UL/CSA), making it suitable for worldwide deployment.

Function / Application

The Siemens 3RT1056-6NB36 power contactor is primarily used for switching 3-phase asynchronous motors and other resistive loads in applications such as:

• Direct-on-line (DOL) motor starting
• Switching heating elements and lighting circuits
• Integration into complex motor feeders and load groups requiring high current capacity and precise electronic control.

Contact us today for pricing and availability, or for more of our high-quality industrial automation components, visit turll.