Siemens SIRIUS 3RT1075-6NF36 Power Contactor, 400A, 200kW, AC/DC Original Brand New

Overview: High-Performance Industrial Motor Switching

The Siemens 3RT1075-6NF36 is a robust, 3-pole power contactor from the trusted SIRIUS 3RT10 family, specifically engineered for the reliable switching of electric motors up to 200 kW (at 400 V). This high-current contactor (rated for 400 A in AC-3e/AC-3 utilization categories) is ideal for heavy-duty industrial applications requiring high operational current and power switching capability.

Its compact design, combined with Siemens’ proven SIRIUS modular system, ensures excellent performance, high contact reliability, and easy integration into complex control panels and motor feeders.

Key Technical Specifications & Features

• Product Type: Power Contactor for Motor Switching
• Manufacturer: Siemens
• Series: SIRIUS 3RT10 (Size S12)
• Product Number: 3RT1075-6NF36
• Operational Current (AC-3e/AC-3): 400 A (at 400 V)
• Operational Power (AC-3e/AC-3): 200 kW (at 400 V)
• Poles: 3-pole design
• Coil Control Voltage (Uc​): 96-127 V AC (50/60 Hz) / DC (Wide voltage range for flexible application)
• Drive Type: Electronic Drive
• Auxiliary Contacts: Integrated 2 NO (Normally Open) + 2 NC (Normally Closed)
• Main Circuit Connection: Busbar connection for high-current applications
• Control/Auxiliary Circuit Connection: Screw terminals
• Special Feature: Integrated 24 V DC PLC Input for direct connection to a Programmable Logic Controller.
• Standards: IE3/IE4 Ready, IEC and UL/CSA approved.

Benefits & Advantages

1. High Power & Reliability: Designed for safely and reliably switching large electric motors and loads up to 400 A / 200 kW.
2. Flexible Control: Features an electronic wide-range AC/DC coil (96-127 V UC) which reduces stock variants and ensures reliable operation across a wider voltage tolerance.
3. PLC Integration: The dedicated 24 V DC PLC input simplifies wiring and direct control from modern automation systems (PLCs).
4. Space-Saving Design: Part of the modular SIRIUS system, offering a compact footprint relative to its switching capacity (Size S12).
5. Simplified Installation: Offers secure busbar connection for the main circuit and universally used screw terminals for control and auxiliary circuits.
6. Ready for Modern Motors: IE3/IE4-ready, meeting current and future standards for energy-efficient motor switching.

Function

The Siemens 3RT1075-6NF36 contactor’s primary function is to serve as a reliable switching element in industrial motor control applications. It allows a low-power control signal from a PLC or control circuit to safely switch a high-power three-phase electrical circuit. The integrated auxiliary contacts (2NO + 2NC) provide critical feedback signals to the control system for status monitoring and interlocking functions. The electronic drive ensures precise and quiet switching operations.