Siemens 3RT1076-2AD36 SIRIUS Power Contactor, 500A, 250 kW, 42-48V AC/DC Coil, Spring-Loaded Terminals Original Brand New

Overview: High-Performance Siemens SIRIUS Power Contactor

The Siemens 3RT1076-2AD36 is a robust, 3-pole SIRIUS power contactor designed for reliably switching motors and heavy-duty industrial loads up to 250 kW at $400\text{ V}$. Part of the modular SIRIUS system, this contactor offers a compact design with exceptional performance and high contact reliability, making it an essential component in modern industrial control and automation systems.

Key specifications include a high operational current of $500\text{ A}$ (for AC-3e/AC-3 switching), a flexible control voltage range of $42\text{-}48\text{ V AC (50-60 Hz)/DC}$ for conventional drive operation, and pre-installed $2\text{ NO}+2\text{ NC}$ auxiliary contacts for simplified wiring and monitoring. The use of busbar connections for the main circuit and spring-loaded terminals for the control and auxiliary circuits ensures fast, maintenance-free, and vibration-proof installation.

Benefits & Key Features

• High Power Density: $500\text{ A}/250\text{ kW}$ capability in a compact design (Size S12), saving valuable panel space.
• Flexible Control: Conventional coil drive supports both $42\text{-}48\text{ V AC}$ and $42\text{-}48\text{ V DC}$ operation, suitable for various control systems.
• Fast & Secure Wiring: Spring-loaded terminals on the control and auxiliary circuits ensure quick, reliable, and vibration-proof connections, reducing maintenance time.
• Robust Main Circuit Connection: Designed with a busbar main circuit for high-current, secure power distribution.
• Integrated Auxiliary Switches: Comes with $2\text{ NO}+2\text{ NC}$ pre-installed auxiliary contacts, simplifying design and reducing component count.
• Modular SIRIUS System: Seamlessly integrates with other components in the Siemens SIRIUS modular system, such as motor protection circuit breakers and overloads, for building complete, high-performance load feeders.
• Global Standard Compliance: IEC and UL/CSA approved, ensuring suitability for worldwide applications.

Function

The 3RT1076-2AD36 functions as an electrically operated switch for establishing, carrying, and interrupting an electric power circuit. Primarily, it is used for switching motors (AC-3e/AC-3 operation) in applications like pumps, fans, compressors, and conveyors. It connects the motor to the power supply (via the main busbar) when the low voltage ($42\text{-}48\text{ V AC/DC}$) is applied to the conventional coil drive. The integrated auxiliary contacts provide switching status feedback to the control system (e.g., PLC or relays).

Application

Ideal for heavy-duty industrial applications requiring reliable switching of high-power three-phase motors:

• HVAC systems
• Pumping stations
• Conveyor systems
• Machinery and plant engineering
• General load switching up to $500\text{ A}$ (AC-1)

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