Siemens 3RT1056-2AB36 SIRIUS Power Contactor, 185A, 90kW, AC-3e/AC-3, 23-26V UC Coil, Spring-Loaded Terminal Original Brand New

Overview

The Siemens 3RT1056-2AB36 is a high-performance SIRIUS power contactor specifically designed for switching motors up to 185 A (AC-3e/AC-3) and 90 kW at 400 V. As part of the modular SIRIUS 3RT10 contactor series (Size S6), this 3-pole device offers exceptional reliability and a compact design for modern industrial control applications. It features a conventional drive and a versatile wide-range 23-26 V AC/DC (UC) control voltage coil, making it suitable for both AC and DC control systems.

The main circuit connection is optimized for busbars, while the control and auxiliary circuits utilize robust, vibration-proof spring-loaded terminals for fast and maintenance-free wiring.

Key Specifications

• Product Number: 3RT1056-2AB36
• Manufacturer: Siemens
• Product Series: SIRIUS 3RT10 (Size S6)
• Type: Power Contactor for Motor Switching
• Operating Current (AC-3e/AC-3): $185A$
• Rated Power: $90kW$ at 400 V
• Poles: 3-pole
• Control Coil Voltage (Uc​): 23-26 V AC (50-60 Hz) / DC (Wide Voltage Range)
• Auxiliary Contacts: 2 NO (Normally Open) + 2 NC (Normally Closed)
• Main Circuit Connection: Busbar connection
• Control/Auxiliary Circuit Connection: Spring-loaded terminal (fast and reliable)
• Drive: Conventional

Benefits

• High Reliability & IE3/IE4 Ready: Designed for dependable operation, ensuring high contact reliability and meeting the stringent requirements for switching highly-efficient IE3/IE4 motors (AC-3e utilization category).
• Fast, Secure Wiring: Spring-loaded terminals on the control and auxiliary circuits provide a vibration-proof connection, significantly reducing wiring time and maintenance compared to traditional screw terminals.
• Space-Saving Design: The compact Size S6 design allows for high packing density in control cabinets without compromising performance.
• Universal Control: The wide-range 23-26V AC/DC (UC) coil simplifies inventory and maintenance, offering flexibility for various power supply systems.
• Integrated Functions: Comes pre-installed with $2NO+2NC$ auxiliary switches, reducing complexity and the need for external components.

Function

The Siemens 3RT1056-2AB36 power contactor functions as an electromechanical switching device used to establish or interrupt an electric power circuit, most commonly for controlling three-phase electric motors. When the 23-26V AC/DC (UC) control coil is energized, it closes the main contacts, allowing the $185A$ current to flow to the motor.

The integrated $2NO+2NC$ auxiliary contacts provide feedback or interlocking functions within the control circuit. Its design ensures safe and reliable switching of high-current, high-power loads up to $90kW$, conforming to international standards like IEC and UL/CSA.

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