Siemens 3RT2037-3NE34 Power Contactor 65A, 30kW, 48-80V AC/DC, S2 Size with Integrated Varistor & 2NO+2NC Aux Contacts Original Brand New

Overview 

The Siemens 3RT2037-3NE34 is a high-performance, S2 size power contactor designed for reliable switching of motors and electrical loads. Engineered to meet the demanding requirements of industrial applications, this contactor offers a robust solution for controlling a wide range of machinery.

Its key features include a high current rating of 65A, a power rating of 30 kW at 400V, and a versatile control voltage range of 48-80V AC/DC, making it suitable for global use. The integrated varistor provides crucial surge protection, extending the life of the control circuit. With both screw and spring-loaded terminals, it offers flexible and secure wiring options for main, control, and auxiliary circuits.

Key Features & Benefit

• High Current & Power Capacity: Rated for 65A (AC-3e/AC-3) and 30 kW at 400V, this contactor is ideal for controlling powerful motors and heavy-duty industrial loads.
• Versatile Control Voltage: Operates on a wide 48-80V AC/DC control voltage range, providing flexibility and simplifying system design in various power environments.
• Integrated Varistor: The built-in varistor protects the control coil and the overall system from voltage spikes and surges, enhancing reliability and preventing damage to sensitive components.
• Comprehensive Auxiliary Contacts: Equipped with 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts, allowing for complex control and signaling circuits.
• Dual Terminal Types: Features screw terminals for the main circuit and spring-loaded terminals for the control and auxiliary circuits, offering secure, vibration-proof connections and faster installation.
• Removable Auxiliary Switch: The removable design of the auxiliary switch provides ease of maintenance and allows for field replacement or customization.
• Compact S2 Size: Its S2 frame size offers a balance of power handling capability and space efficiency, making it suitable for installation in control panels where space is a premium.
• Durable and Reliable: As part of the Siemens SIRIUS series, the 3RT2037-3NE34 is built with high-quality materials to ensure long-term performance and minimal maintenance.

Function

The Siemens 3RT2037-3NE34 functions as a remote-controlled electrical switch. When the control coil is energized by a voltage within the 48-80V AC/DC range, it creates a magnetic field that pulls the main contacts together. This action closes the main circuit, allowing power to flow to the connected load (e.g., an electric motor).

Simultaneously, the auxiliary contacts change their state (NO contacts close, NC contacts open), providing feedback and interlocking signals for the control system. When the control voltage is removed, a spring forces the main contacts open, interrupting the power supply to the load.

Technical Specification

• Product Number: 3RT2037-3NE34
• Product Type: Power Contactor
• AC-3e/AC-3 Current Rating: 65 A
• Motor Power (400 V): 30 kW
• Poles: 3-pole
• Control Voltage: 48-80 V AC/DC (50/60 Hz)
• Auxiliary Contacts: 2 NO + 2 NC
• Main Circuit Terminals: Screw Terminal
• Control/Auxiliary Terminals: Spring-Loaded Terminal
• Size: S2
• Special Features: Integrated Varistor, Removable Auxiliary Switch

Application

This contactor is an essential component in a wide variety of industrial automation and control systems, including:

• Motor control for pumps, fans, and compressors.
• HVAC systems.
• Conveyor systems.
• Switching of resistive loads and lighting circuits.
• General machine building and plant engineering.