Siemens Power contactor, AC-3e/AC-3, 3-pole, 2NO+2NC, 24VDC, 38A Part number 3RT2028-1BB44

Product Overview

The Siemens 3RT2028-1BB44 is a 3-pole SIRIUS 3RT2 power contactor in size S0, designed for reliable switching of three-phase motors and industrial loads. It supports AC-3 duty up to 38 A at 400 V, corresponding to a motor rating of approximately 18.5 kW. The unit is equipped with a 24 V DC control coil and comes with 2 NO + 2 NC auxiliary contacts, offering flexible control and signalling options.

Key Features

• 3-pole power contactor – SIRIUS 3RT2, size S0
• Rated operational current: 38 A (AC-3 at 400 V)
• Supports motor loads up to approx. 18.5 kW at 400 V
• 24 V DC control coil
• Auxiliary contacts: 2 NO + 2 NC
• Screw terminals for both main and auxiliary circuits
• Compact size S0 for efficient panel layout

Technical Specifications

• Article Number: 3RT2028-1BB44
• Series: SIRIUS 3RT2 – Size S0
• Main Poles: 3
• Rated Current (AC-3, 400 V): 38 A
• Rated Motor Power (400 V): approx. 18.5 kW
• Control Coil Voltage: 24 V DC
• Auxiliary Contacts: 2 NO + 2 NC
• Connection Type: Screw-type terminals
• Rated Insulation Voltage: 690 V
• Surge Voltage Resistance: 6 kV

Compliance & Certifications

• Manufactured under Siemens SIRIUS contactor quality standards
• Compliant with IEC/EN standards for low-voltage switching devices

Applications

Ideal for switching and controlling medium-power three-phase motors, pumps, compressors, conveyors and industrial loads. Suitable for use in control panels, automation systems and motor starter combinations requiring 38 A AC-3 switching capability.