Siemens SIRIUS 3RT2037-1AF04 Power Contactor, 65A, 30kW, 3-Pole, 110V AC Coil, Size S2, Screw Terminal Original Brand New

Overview

The Siemens SIRIUS 3RT2037-1AF04 is a robust, high-performance power contactor engineered for safe and reliable switching of electric motors and other resistive loads in industrial control systems. As part of the highly modular SIRIUS system, this 3-pole contactor is designed for use in AC-3e/AC-3 applications, making it suitable for modern, high-efficiency IE3/IE4 motors. Its compact size S2 design saves valuable space in control cabinets.

Key Technical Specification

• Manufacturer: Siemens SIRIUS
• Product Type: Power Contactor for Motor Switching
• Product Series: 3RT2
• Rated Operational Current (AC-3e/AC-3): $65A$ at $400V$
• Rated Operational Power (AC-3e/AC-3): $30kW$ at $400V$
• Number of Poles: 3-pole (3 NO main contacts)
• Control Supply Voltage (Coil Voltage): $110VAC$, $50Hz$
• Auxiliary Contacts: $2NO$ (Normally Open) $+2NC$ (Normally Closed)
• Connection Type: Screw Terminal (for main, control, and auxiliary circuits)
• Contactor Size: S2
• Special Feature: Removable auxiliary switch block

Function

The 3RT2037-1AF04 functions as an electromagnetic switch. When the $110VAC$ control voltage is applied to the coil, it creates a magnetic field that closes the three main contacts, allowing the $400V$ power to flow to the connected load (e.g., a $30kW$ motor). The integrated $2NO+2NC$ auxiliary contacts provide feedback on the contactor’s status and are essential for interlocking or control circuitry.

Benefit

• High Reliability & Long Service Life: Designed for consistent performance and a long mechanical service life (typically 10 million switching cycles), ensuring minimal downtime.
• Compact, Space-Saving Design: The Size S2 form factor is optimized for efficient use of space in crowded control panels.
• IE3/IE4 Motor Ready: Complies with the stringent requirements of IEC 60947-4-1 category AC-3e, making it ideal for controlling the latest high-efficiency motors.
• Easy & Flexible Integration: Part of the highly compatible SIRIUS modular system, allowing for easy combination with other SIRIUS components like overload relays and function modules.
• Global Applicability: Approved for worldwide use, including IEC and UL/CSA standards.
• Simplified Wiring: Robust screw terminals ensure secure and reliable connection for both power and control circuits. The removable auxiliary switch simplifies maintenance and configuration changes.

Application 

The Siemens 3RT2037-1AF04 Power Contactor is the perfect choice for demanding switching applications, including:

• Motor Control Centers (MCCs)
• Starting and stopping $30kW$ three-phase motors
• Control of pumps, fans, and compressors
• Heating, ventilation, and air conditioning (HVAC) systems
• Industrial automation machinery

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