Siemens SIRIUS 3RT1374-6AR36 Contactor 500A AC-1, 4-Pole, 250-500V AC/DC, S12, Rail/Screw Terminal Original Brand New

Overview

The Siemens SIRIUS 3RT1374-6AR36 is a high-performance power contactor designed for reliable switching of non-inductive loads (AC-1) in industrial applications. This robust 4-pole contactor boasts an impressive 500 A current rating at 400 V and 40 °C, making it suitable for demanding power control requirements. Featuring a wide-range solid-state operating mechanism (250-500 V AC/DC) with integrated coil damping (varistor), it ensures consistent and efficient operation. Its S12 frame size, coupled with convenient connection rail and screw terminals, simplifies installation and integration into existing systems. The 3RT1374-6AR36 is equipped with 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts for enhanced control and feedback.

Key Features & Benefit

• High Power Switching: Rated for 500 A (AC-1) at 400 V, ideal for controlling resistive loads, heating, and distribution circuits.
• Versatile Control Voltage: Wide-range solid-state operating mechanism accepts 250-500 V AC/DC, reducing the need for multiple coil variants and simplifying inventory.
• Integrated Coil Damping: Built-in varistor protects against overvoltage surges, extending the lifespan of the contactor and connected equipment.
• Robust 4-Pole Design: Provides comprehensive control for multi-phase systems or applications requiring multiple switching paths.
• Generous Auxiliary Contacts: Includes 2 NO + 2 NC contacts for flexible interlocking, signaling, and control circuit integration.
• Easy Connection: Features both connection rail and screw terminals, offering versatile wiring options for different panel designs.
• Standards Compliance: Manufactured to meet international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, ensuring safety and reliability.
• Durable and Reliable: Part of the Siemens SIRIUS family, known for its long service life and consistent performance in harsh industrial environments.

Function

• Four-pole switching of weak or non-inductive loads (AC-1): Primarily designed for resistive loads, heating elements, and general power distribution where the inductive component is minimal.
• Disconnecting loads or power generation plants from the grid: Acts as a reliable isolating device.
• Transfer switching: Can be used in applications requiring switching between different power sources or loads.
• Integration with Overload Relays: Seamlessly integrates with Siemens 3RB2 electronic overload relays for comprehensive motor and load protection.
• Control Circuit Integration: Auxiliary contacts facilitate complex control logic, interlocking, and status indication.

Protection and Safety:

• Short-Circuit and Overload Protection: Main connections require external protection. Auxiliary and control circuits also require suitable short-circuit and overload protection (e.g., miniature circuit breakers).
• Overvoltage Protection: The 3RT13 series contactors are factory-equipped with integrated coil damping (varistor) to protect against overvoltage surges.
• Standards Adherence: Conforms to relevant international standards for industrial control equipment, ensuring operational safety.

Connection Methods:

• Main Circuit: Screw terminals with connecting bars, allowing connection with cable lugs or flexible/rigid busbars. Can be fitted with broadened bus connectors (accessories available).
• Auxiliary and Control Circuit: Screw terminals for secure and reliable wiring.

Application

The Siemens SIRIUS 3RT1374-6AR36 contactor is ideally suited for:

• Controlling resistive heating elements.
• Switching lighting systems.
• Managing power distribution in industrial and commercial buildings.
• Connecting and disconnecting capacitor banks.
• Isolation of power generation plants.
• Any application requiring reliable 4-pole switching of non-inductive or slightly inductive loads.