Siemens SIRIUS 3RT2045-3AK60 Power Contactor S3, 80A, Spring Terminal Original Brand New

Overview

The Siemens 3RT2045-3AK60 is a robust 3-pole power contactor from the trusted SIRIUS 3RT2 series, designed for reliably switching motors and other resistive loads. Classified for performance up to 80 A (AC-3e/AC-3) and rated for 37 kW at 400 V, this Size S3 contactor is a standard choice for demanding industrial control applications. Its dual-voltage AC coil operates at 110 V AC (50 Hz) or 120 V AC (60 Hz), providing flexibility for global use. The unit integrates one Normally Open (NO) and one Normally Closed (NC) auxiliary contact for feedback and interlocking circuits.

Key Specification

• Product Number: 3RT2045-3AK60
• Series: SIRIUS 3RT2
• Contactor Size: S3
• Poles: 3-pole
• Operating Current (AC-3e/AC-3): 80 A
• Rated Power: 37 kW at 400 V
• Control Coil Voltage: 110 V AC (50 Hz) / 120 V AC (60 Hz)
• Auxiliary Contacts: 1 NO + 1 NC integrated
• Main Circuit Connections: Screw terminals (robust and high-contact reliability)
• Control/Auxiliary Circuit Connections: Spring-loaded terminals (fast, vibration-proof, and maintenance-free wiring)
• Mounting: DIN rail or screw fixing

Benefit

• Fast, Secure Wiring: The combination of traditional screw terminals for the main power circuit and innovative spring-loaded terminals for control/auxiliary wiring significantly reduces installation time, ensures a reliable, vibration-proof connection, and minimizes maintenance.
• High Performance in a Compact Design: Size S3 offers a high switching capacity of 80A (AC-3) and 37kW, making it ideal for powerful motor applications without requiring excessive panel space.
• Global Compatibility: The dual-frequency 110/120 V AC coil is suitable for use in diverse electrical systems worldwide.
• Long Mechanical Life: With a typical mechanical service life of 10 million operating cycles, the 3RT2045-3AK60 offers exceptional durability and reliability, reducing downtime.
• System Integration: Part of the modular SIRIUS system, allowing for seamless expansion with additional auxiliary switch blocks, overload relays (thermal or solid-state), and other accessories.

Function

This power contactor's primary function is to act as an electrically controlled switch for high-current loads, typically electric motors in industrial machinery. It ensures safe and reliable Direct On Line (DOL) starting and stopping of 3-phase motors.

The auxiliary contacts provide essential signaling capabilities for interlocking, status monitoring, and integration into safety circuits. The robust design and high-quality materials guarantee reliable operation under demanding industrial conditions, compliant with international standards like IEC 60947.