Siemens 3RT1056-2AU36 Power Contactor SIRIUS 185A, 90kW, S6 Original Brand New

Overview

The Siemens 3RT1056-2AU36 is a high-performance SIRIUS Power Contactor designed for switching motors and other resistive loads in industrial control systems. As part of the reliable SIRIUS 3RT1 series, this 3-pole contactor is engineered for demanding applications, offering an impressive switching capacity of 185 A (for AC-3e/AC-3 motor duty) and a rated power of 90 kW at 400 V.

It features a versatile, conventional operating mechanism suitable for both AC and DC control voltages (Uc​:240−277 V) and comes standard with 2 normally open (NO) + 2 normally closed (NC) integrated auxiliary contacts for reliable signaling and interlocking. The main circuit uses robust busbar connections for high current capacity, while the control and auxiliary circuits utilize time-saving, vibration-proof spring-loaded terminals.

Key Product Specification

• Product Number: 3RT1056-2AU36
• Series: SIRIUS 3RT1
• Contactor Type: Power Contactor for switching motors
• Number of Poles: 3-pole
• Rated Current (AC-3e/AC-3): 185 A
• Rated Power (AC-3/400V): 90 kW
• Control Coil Voltage (Uc​): 240-277 V AC (50-60 Hz) / DC (Universal Control)
• Auxiliary Contacts: 2 NO + 2 NC (integrated)
• Drive Type: Conventional
• Main Circuit Connection: Busbar
• Control/Auxiliary Circuit Connection: Spring-loaded terminal
• Size: S6

Benefit & Features

1. High Reliability & Durability: Engineered as part of the SIRIUS modular system, providing extreme ruggedness and long-lasting mechanical and electrical service life for critical applications.
2. Universal Control Voltage: The 240-277 V UC (AC/DC) coil reduces inventory complexity and ensures flexibility in control circuit design.
3. Space and Cost Efficiency (S6 Size): Optimized, compact design allows for higher packing density in control cabinets.
4. Time-Saving Wiring: Spring-loaded terminals on the control and auxiliary circuits offer fast, secure, and maintenance-free connections, resistant to vibration.
5. Enhanced Signal Capability: Includes integrated 2 NO + 2 NC auxiliary contacts, simplifying wiring for control, interlocking, and status indication.
6. High Power Switching: Ideal for starting and stopping high-power 3-phase motors up to 90 kW (400V).

Application

The Siemens 3RT1056-2AU36 Power Contactor is the ideal choice for switching motors and systems in various high-power industrial applications, including:

• Controlling large 3-phase AC motors (Direct-On-Line start)
• Pump and fan control systems
• Conveyor systems and material handling
• HVAC and refrigeration systems
• General high-current industrial load switching

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