Siemens Power contactor, S3, 3-pole, spring-loaded, 230VAC, 37kW Part number 3RT2045-3AL20

Product Overview

The Siemens 3RT2045-3AL20 is a size S3 SIRIUS power contactor, designed for three-phase motor switching in AC-3/AC-3e applications. It is rated at 80 A in AC-3 at 400 V and supports motor loads up to approx. 37 kW at 400 V. It features a 230 V AC control coil, three main poles, screw-type main terminals and spring-type auxiliary terminals including one NO + one NC auxiliary contact.

Key Features

• 3-pole power contactor in the SIRIUS 3RT2 series, size S3
• Rated current: 80 A at AC-3, 400 V
• Motor load capability: up to approx. 37 kW at 400 V
• Control coil voltage: 230 V AC (50/60 Hz)
• Auxiliary contacts: 1 NO + 1 NC for signaling or interlocking
• Main circuit screw terminals; control & auxiliary circuits spring-type terminals
• High switching capacity and robust design suitable for heavy-duty industrial applications

Technical Specifications

• Article Number: 3RT2045-3AL20
• Series: SIRIUS 3RT2 Size S3
• Poles: 3 (three-phase)
• Rated Operational Current (AC-3) at 400 V: 80 A
• Rated Motor Power at 400 V: approx. 37 kW
• Control Coil Voltage: 230 V AC (50/60 Hz)
• Auxiliary Contact Configuration: 1 NO + 1 NC
• Connection Type: Screw terminals for main circuit; spring-type terminals for control/auxiliaries
• Size Class: S3

Compliance & Certifications

• Manufactured to Siemens SIRIUS industrial control-gear quality standards
• Designed in compliance with IEC/EN standards for low-voltage power contactors in motor circuits

Applications

Ideal for motor switching and control in industrial plants, including conveyors, pumps, compressor drives and machinery where high switching loads and robust motor protection are required. Suitable for applications with three-phase systems and motor loads up to approximately 37 kW at 400 V.