Siemens 3RT2337-3XB40-0LA2 Traction Contactor, AC-1, 110A, 24V DC Original Brand New

Siemens 3RT2337-3XB40-0LA2 Traction Contactor

The Siemens 3RT2337-3XB40-0LA2 is a high-performance, 4-pole traction contactor engineered for demanding applications, particularly in the railway sector. Designed to meet stringent industry standards including IEC 60947-4-1, IEC 60077-2, and EN 50155, this contactor offers exceptional reliability and durability in harsh operating environments.

Overview

This robust AC-1 contactor handles currents up to 110 A at 400 V / 40 °C. It features a 24 V DC solid-state operating mechanism with an extended voltage operating range of 0.7-1.25* Uc, ensuring consistent performance even with voltage fluctuations. The integrated varistor provides crucial overvoltage protection, enhancing the lifespan of the device. With a compact frame size S2, the 3RT2337-3XB40-0LA2 is equipped with 1 NO + 1 NC auxiliary contacts for versatile control. Main circuit connections utilize secure screw terminals, while the control and auxiliary circuits benefit from vibration-resistant spring-loaded terminals.

Standard & Approval:

• IEC 60947-4-1: General purpose low-voltage switchgear and controlgear.
• IEC 60077-2: Railway applications – Rolling stock – Electric equipment – Part 2: Electrotechnical components – General rules.
• EN 50155: Railway applications – Rolling stock – Electronic equipment.

Performance Range & Application: Part of Siemens’ comprehensive contactor portfolio, the 3RT2337-3XB40-0LA2 is specifically designed for low or non-inductive loads (AC-1). Its approval in compliance with IEC 60077-2 and EN 50155 makes it an ideal choice for railway applications, where it meets increased requirements such as:

• Extended Temperature Range: Operates reliably from -40 to +70 °C, exceeding standard industrial limits.
• Extended Operating Range: Solid-state DC operating mechanisms from 0.7 to 1.25 x Us, ensuring stable performance across varying supply voltages.
• Increased Resistance: Engineered to withstand mechanical oscillations and vibrations, crucial for mobile applications. The spring-loaded connection system further enhances vibration resistance.

Key Function & Features:

• Traction Contactor (AC-1): Specifically designed for switching low or non-inductive loads up to 110 A.
• Solid-State Operating Mechanism: Ensures reliable and consistent operation across a wide voltage range (0.7-1.25* Uc) and extended temperatures.
• Integrated Varistor: Provides effective overvoltage protection for the control coil, extending device longevity.
• Auxiliary Contacts (1 NO + 1 NC): Offers flexibility for control and signaling circuits.
• Dual Terminal System: Screw terminals for robust main circuit connections and spring-loaded terminals for secure, vibration-resistant control and auxiliary circuit wiring.
• Frame Size S2: Compact design for efficient panel space utilization.
• Railway Approved: Certified to IEC 60077-2 and EN 50155 for superior performance in rail transport.

Benefit

• Exceptional Reliability in Harsh Environments: Withstands extreme temperatures, vibrations, and voltage fluctuations, making it perfect for railway and demanding industrial applications.
• Enhanced Service Life: Integrated varistor and robust design contribute to prolonged operational life, reducing maintenance costs.
• Versatile Connectivity: Screw and spring-loaded terminals offer secure and flexible wiring options.
• Compliance & Safety: Meets critical international standards, ensuring safe and compliant operation in specialized applications.
• Easy Integration: Standardized frame size and clear terminal assignments simplify installation and integration into existing systems.
• Minimized Downtime: Designed for high resistance to mechanical stresses, leading to fewer failures and improved system uptime.

Protection & Configuration

• Short-Circuit and Overload Protection:
  • Main Connections: Refer to the technical product data sheet for free-standing contactor protection. For device combinations (contactor with overload relay or circuit breaker), consult the Digital Configuration Manual for load feeders.
  • Auxiliary Connections: Specific protection details are available in the technical product data sheet.
  • Control Supply Voltage: Protection requires considering relevant standards for control panel configuration, cable dimensioning, and selecting suitable power supplies with current-limiting functions. Inrush current peaks and holding power characteristics of the contactor must be considered.
• Overvoltage Protection: Integrated varistor provides coil damping. Note that damping influences break times and auxiliary contact delay times; consult the Equipment Manual for detailed time response information.

Auxiliary Contact Mounting: The 3RT2337-3XB40-0LA2 (a 3RT20 contactor in size S2) includes two integrated auxiliary contacts (1 NO + 1 NC). Further expansion is possible with additional front or side-mounted auxiliary switches (observe permissible configuration).

Ambient Conditions:

• Operating Temperature: Permissible ambient temperature for operation is -40 to +70 °C.
• Side-by-Side Mounting (Solid-State Operating Mechanism, S00 to S3): Permissible at ambient temperatures up to 70 °C, offering flexible installation options without spacing requirements in most cases.

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