Siemens 3RT1076-6AT36 Power Contactor 500A, 250kW, SIRIUS, S12 Original Brand New

Overview

The Siemens 3RT1076-6AT36 is a robust, high-performance power contactor from the renowned SIRIUS modular system, specifically designed for switching motors up to 250 kW at $400\text{ V}$. This heavy-duty, 3-pole contactor is rated for $500\text{ A}$ (AC-3e/AC-3) and features a wide voltage range 575-600 V AC (50-60 Hz) / DC conventional coil drive, ensuring reliable operation across various industrial power systems.

Part of the size S12 range, the 3RT1076-6AT36 is engineered for large current applications, offering exceptional contact reliability and a long mechanical service life. Its main circuit utilizes busbar connections for high current load feeders, while the control and auxiliary circuits are equipped with reliable screw terminals.

Key Features & Technical Specification

• Product Type: Power Contactor (Motor Switching)
• Series: Siemens SIRIUS 3RT1, Size S12
• Pole Configuration: 3-pole
• Rated Operational Current (Ie): $500\text{ A}$ (AC-3e/AC-3 up to $400\text{ V}$)
• Power Rating: $250\text{ kW}$ at $400\text{ V}$
• Coil Control Voltage (Uc): $575-600\text{ V}$ AC (50/60 Hz) / DC (Wide Voltage Range)
• Auxiliary Contacts: Integrated $2\text{ NO}+2\text{ NC}$ (Normally Open + Normally Closed)
• Main Circuit Connection: Busbar connection
• Control/Auxiliary Circuit Connection: Screw terminals
• Drive Type: Conventional
• Standards: IEC 60947, IE3/IE4 ready

Benefit

• High Power Motor Control: Perfectly suited for switching large three-phase motors up to $250\text{ kW}$, ideal for demanding industrial environments like heavy machinery, wind turbines, and large pump systems.
• Flexible AC/DC Operation: The wide voltage range $575-600\text{ V}$ AC/DC conventional drive simplifies stock-keeping and provides flexibility in system design.
• Enhanced Reliability: The SIRIUS 3RT series is known for its ruggedness and high contact reliability, ensuring safe and supreme switching performance.
• Simplified Wiring: Busbar connections on the main circuit streamline installation in high-current distribution systems, while screw terminals on the control side allow for secure wiring of auxiliary circuits.
• Ready for Modern Efficiency: Fully compatible with highly efficient IE3 and IE4 motors, future-proofing your control system.
• Integrated Monitoring: Comes with pre-installed $2\text{ NO}+2\text{ NC}$ auxiliary contacts for easy integration into control and signaling circuits.

Function

The Siemens 3RT1076-6AT36 contactor functions as an electromechanical switching device primarily used for remotely controlling and switching electrical power circuits, most commonly for starting and stopping electric motors. When the control coil is energized with $575-600\text{ V}$ AC/DC, the main contacts close, connecting the $500\text{ A}$ main circuit load (e.g., a motor) to the power supply. The integrated auxiliary contacts provide immediate feedback on the contactor’s state (open/closed) to the control system or PLC.