Siemens 3RT1374-6AF36 SIRIUS Power Contactor AC-1, 500A, 4-Pole, 48-130V AC/DC, S12 Original Brand New

Overview

The Siemens 3RT1374-6AF36 is a high-performance SIRIUS 3RT13 series power contactor engineered for demanding industrial applications. Specifically designed for AC-1 duty, this robust 4-pole contactor excels at switching weak or non-inductive loads up to 500 A at 400 V and 40 °C. Its S12 frame size signifies substantial power handling capabilities, while the wide-range 48-130 V AC/DC solid-state operating mechanism ensures flexible integration into various control systems.

Equipped with 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts, it provides essential feedback and control options. The 3RT1374-6AF36 offers convenient connection via rail or screw terminals, making it a versatile choice for disconnecting loads, power generation plants from the grid, and transfer switching applications. Built to stringent IEC standards, this contactor incorporates internal varistor damping for coil protection and boasts excellent electromagnetic compatibility.

Key Features & Function

• High Current Rating: Handles significant AC-1 loads up to 500 A at 400 V and 40 °C, suitable for resistive heating, lighting, and general power distribution.
• 4-Pole Configuration: Provides simultaneous switching for all four phases, ideal for applications requiring multi-phase control.
• Wide-Range AC/DC Control: Features an advanced solid-state operating mechanism with a universal control voltage range of 48-130 V AC/DC (0.85-1.1 Us for AC, 0.8-1.1 Us for DC), simplifying inventory and design.
• Integrated Coil Damping: Equipped with a built-in varistor for effective damping of opening surges in the coil, enhancing coil longevity and system reliability.
• Auxiliary Contacts: Includes 2 NO + 2 NC auxiliary contacts for comprehensive signaling and interlocking functions within control circuits. These contacts offer high contact reliability, especially for low voltages and currents.
• Robust S12 Frame Size: Designed for heavy-duty applications, ensuring durability and stable performance under demanding conditions.
• Flexible Connection Options: Main circuit connections via screw terminals with connecting bars, allowing for cable lugs or flexible/rigid busbars. Auxiliary and control circuits utilize reliable screw terminals.
• Standards Compliance: Fully compliant with international standards including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1 (for auxiliary switches), ensuring global applicability and safety.
• Electromagnetic Compatibility (EMC): Fulfills requirements for environment category A, minimizing interference with other electronic equipment.
• Motor Protection Compatibility: Seamlessly integrates with 3RB2 electronic overload relays for comprehensive motor protection when used in relevant applications.

Benefit

• Reliable Performance: Engineered for consistent and safe operation in demanding industrial environments, ensuring long service life.
• Versatile Application: Ideal for a wide array of AC-1 applications, including power distribution, heating, lighting, and general switching of non-inductive loads.
• Simplified Design & Inventory: The wide-range control voltage and 4-pole design reduce the need for multiple contactor variants.
• Enhanced System Protection: Integrated coil damping and compatibility with external protection devices (overload relays, circuit breakers) safeguard both the contactor and connected equipment.
• Easy Integration: Clear connection methods and adherence to international standards facilitate straightforward installation and commissioning.
• Robust Construction: The S12 frame and quality components contribute to the contactor’s resilience against harsh operating conditions.
• Comprehensive Control Options: Multiple auxiliary contacts provide ample opportunities for interlocking, signaling, and system automation.

Standard & Protection

The Siemens 3RT1374-6AF36 contactor adheres to the following key international standards:

• IEC 60947‑1
• IEC 60947‑4‑1
• IEC 60947‑5‑1 (for auxiliary switches)

Protection of Connections: All connections (main, auxiliary, control supply) require appropriate short-circuit and overload protection.

• Main Connections: Refer to the technical product data sheet for free-standing contactor protection. For combinations with overload relays or circuit breakers as motor feeders, consult the Digital Configuration Manual for load feeders.
• Auxiliary Connections: Protection information available in the technical product data sheet.
• Control Supply Voltage: Consider relevant standards for control panel configuration, cable dimensioning, and suitable power supply selection (e.g., current-limiting).
• Overvoltage Protection: The 3RT1374-6AF36 features integrated varistor damping for the coil. While this increases break/delay times slightly, it significantly enhances coil protection against opening surges.

Connection Methods

• Main Circuit: The 3RT1374-6AF36 (a 3RT13 contactor) utilizes screw terminals with connecting bars. Cables can be connected using cable lugs or flexible/rigid busbars. These large contactors can also be fitted with broadened bus connectors (accessories available).
• Auxiliary & Control Circuit: Convenient and reliable screw terminals are provided for auxiliary and control connections.

Electromagnetic Compatibility (EMC)

The contactor fulfills the requirements for environment category A, ensuring minimal electromagnetic interference. When used in environments with frequency converters, consult the Equipment Manual for specific configuration notes.

Contact Reliability of Auxiliary Contacts

The integrated auxiliary contacts are designed for high contact reliability, especially crucial when switching low voltages (≤ 110 V) and currents (≤ 100 mA). They are particularly suitable for solid-state circuits with currents ≥ 1 mA at voltages of 17 V and higher.

Motor Protection

For comprehensive motor protection, the Siemens 3RT1374-6AF36 contactor can be seamlessly combined with Siemens 3RB2 electronic overload relays, which are mounted directly onto the contactor.

Operating Mechanism

This 3RT13 series contactor is equipped with a sophisticated wide-range solid-state operating mechanism. This advanced design allows for control using both 50/60 Hz AC and DC voltages within the specified 48-130 V range. The operating range is 0.8 x Us min to 1.1 x Us max for DC control, and 0.85 x Us min to 1.1 x Us max for AC control.

Maintenance & Accessories

• Replacement: For 3RT13 contactors like the 3RT1374-6AF36, it is not possible to change the operating mechanism or the main contacts.
• Auxiliary Switches: This contactor is supplied with two laterally mounted auxiliary switches (2 NO + 2 NC integrated). Further expansion with additional auxiliary switches is possible, adhering to permissible configurations. Refer to the Accessories ordering data for compatible options.
• Accessories & Spare Parts: A wide range of accessories and spare parts are available to enhance functionality and maintain the system. Please refer to the overview graphic or Accessories ordering data for 3RT135 to 3RT137 contactors.

Application

The Siemens 3RT1374-6AF36 contactor is perfectly suited for a variety of critical applications:

• Four-pole switching of weak or non-inductive loads (AC-1): Ideal for resistive heating, lighting systems, and general power switching where the load current is primarily resistive.
• Disconnecting loads or power generation plants from the grid: Provides a reliable means to isolate electrical systems from the main power supply.
• Transfer switching: Enables seamless transition between different power sources or loads.

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