Siemens 3RT1056-6AF36-3PA0 Power Contactor, SIRIUS 3RT1, 185A, 90kW, 110-127V AC/DC Original Brand New

Overview: Siemens 3RT1056-6AF36-3PA0 SIRIUS Power Contactor

The Siemens 3RT1056-6AF36-3PA0 is a high-performance, 3-pole power contactor from the modular SIRIUS 3RT1 series, engineered for reliable switching of electric motors and other industrial loads up to 185A.

This specific model is a Size S6 contactor, rated for an impressive 185 A (AC-3e/AC-3) and a power rating of 90 kW at 400 V. It features a versatile conventional drive (coil) operating on a wide control voltage range of 110-127 V AC/DC (UC), simplifying coil inventory and application across different control power sources.

It is equipped with 2 NO + 2 NC permanently mounted auxiliary contacts (often referred to as captive, lateral, or built-in auxiliary switches) for enhanced safety and monitoring, complying with regulations such as SUVA. The main circuit utilizes robust busbar connections, while the control and auxiliary circuits use reliable screw terminals. As part of the SIRIUS modular system, this contactor offers a compact design and high contact reliability, making it an essential component in modern, efficient motor control and automation systems.

Benefit & Value Proposition

• High Performance in Compact Design: Achieves 185A and 90kW motor switching capacity in the compact SIRIUS Size S6, saving panel space.
• Reduced Inventory & Versatility: The 110-127V AC/DC (UC) wide-range coil simplifies selection and is compatible with both AC and DC control supplies.
• Enhanced Safety and Monitoring: Permanently mounted 2 NO + 2 NC auxiliary contacts (suitable for SUVA applications) provide reliable status feedback for safety circuits.
• Robust Connection: Busbar connections for the main circuit ensure high current capacity and secure installation in power distribution systems.
• Seamless System Integration: Part of the Siemens SIRIUS modular system, ensuring optimal compatibility with overload relays, auxiliary blocks, and other system components.
• Global Standard Compliance: Climate-resistant and approved for worldwide use (e.g., IEC and UL/CSA), making it IE3/IE4-ready.

Function

The Siemens 3RT1056-6AF36-3PA0 power contactor serves as an electro-mechanical switch in control circuits. Its primary function is to safely and reliably switch high-current loads, specifically 3-phase AC motors (AC-3/AC-3e applications) and general resistive loads (AC-1 applications). When the coil is energized by the 110-127V control voltage, the main contacts close, connecting the motor to the power supply. The permanently mounted auxiliary contacts provide switching signals to the control logic (PLC, relays, etc.) indicating the contactor’s operational status.