Siemens SIRIUS 3RT1056-2XJ46-0LA2 Power Contactor, 185A, 90kW, 72V DC Coil, Rail Application, Size S6 Original Brand New

Overview

The Siemens SIRIUS 3RT1056-2XJ46-0LA2 is a high-performance, 3-pole power contactor from the robust SIRIUS 3RT1 series, specifically engineered for demanding motor switching applications. This Size S6 contactor is rated for 185 A (AC-3e/AC-3) and a power output of 90 kW at 400 V, making it ideal for controlling large electric motors and loads in industrial and heavy-duty environments.

A key feature is its specialized electronic coil drive which operates on 72 V DC, with an extended operating range of $\times (0.7-1.25)$, providing reliable switching even with fluctuating supply voltages common in railway or specific DC systems. Furthermore, it includes a dedicated PLC input (24-110 V DC) for direct and seamless integration with industrial control systems.

Benefit

• Exceptional Reliability for Rail Applications: Certified to IEC 60077 standards, ensuring robust performance and resistance to shock/vibration in railway and specialized transport environments.
• High Power Switching Capacity: Handles significant motor loads with a 185 A current rating and 90 kW power rating, suitable for demanding industrial machinery.
• Optimized DC Electronic Drive: The 72 V DC electronic coil ensures reliable operation across a wide voltage range, reduces holding power consumption, and provides direct interfacing with DC power supplies.
• Seamless PLC Integration: Built-in PLC input (24-110 V DC) simplifies control wiring and integration with safe and non-safe industrial automation systems.
• Time-Saving Connectivity: Spring-loaded terminals for control and auxiliary circuits ensure fast, vibration-proof, and maintenance-free wiring, improving system uptime.
• Modular SIRIUS System: Part of the comprehensive Siemens SIRIUS modular system, allowing easy addition of accessories like auxiliary switches and motor protection components.

Function

The Siemens 3RT1056-2XJ46-0LA2 power contactor is a three-pole electromechanical switching device designed to remotely control and switch a three-phase electric motor or other high-current loads (up to 185 A).

1. Motor Switching: Provides the core function of making and breaking the main circuit (busbar connections) for starting and stopping motors.
2. Electronic Control: The $72\text{ V DC}$ electronic drive coil is energized to close the main contacts. The integrated electronics optimize coil current, reduce heat generation, and tolerate voltage variations.
3. Signaling and Interlocking: The two Normally Open (NO) and two Normally Closed (NC) auxiliary contacts provide feedback to the control system or facilitate electrical interlocking with other devices.
4. Railway Compliance: Designed and rated to withstand the specific environmental and operational stresses, such as shock and vibration, required by the international IEC 60077 standard for railway apparatus.

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