Siemens 3RT2024-2BB44-3MA0 Contactor 12A, 5.5kW, 24V DC, S0, Spring Original Brand New

Overview

The Siemens SIRIUS 3RT2024-2BB44-3MA0 Power Contactor is a high-quality, 3-pole switching device designed for reliable control of standard AC loads, particularly 3-phase motors up to 5.5 kW / 400 V (AC-3e/AC-3). Part of the compact and versatile SIRIUS 3RT2 series, this contactor is engineered for performance in industrial control applications. It features a robust 24 V DC operating coil and spring-loaded terminals for fast, reliable, and vibration-proof wiring.

Key Specification

• Product Number: 3RT2024-2BB44-3MA0
• Brand/Series: Siemens SIRIUS 3RT2
• Type: Power Contactor (Motor Contactor)
• Current Rating (AC-3e/AC-3): 12 A
• Power Rating: 5.5 kW at 400 V
• Coil Voltage: 24 V DC
• Auxiliary Contacts: 2 NO + 2 NC (Captive/Permanently Mounted)
• Size: S0
• Connection Type: Spring-loaded Terminal (Spring-type terminal)

Benefit

• Fast, Secure Wiring: Spring-loaded terminals offer a quick, maintenance-free, and highly vibration-proof connection, reducing installation time and increasing operational reliability compared to screw terminals.
• High Performance: Rated for switching motors up to 5.5 kW (400V) in accordance with the latest IEC standards (AC-3e/AC-3).
• Integrated Auxiliary Contacts: Features a captive auxiliary switch block with 2 Normally Open (NO) + 2 Normally Closed (NC) contacts, simplifying ordering and setup for common control circuit requirements.
• Compact Design (Size S0): Optimized dimensions for space-saving installation in control cabinets and panels.
• Global Standard Compliance: Approved worldwide (e.g., IEC, UL/CSA) and IE3/IE4-ready, ensuring suitability for global projects.

Function & Application

The Siemens 3RT2024-2BB44-3MA0 functions primarily as a dependable switch for electrical loads. Its main purpose is the frequent switching of 3-phase motors and other resistive or highly inductive loads (load class AC-3e/AC-3).

Application

• Switching and control of industrial 3-phase motors.
• Controlling heating, ventilation, and air conditioning (HVAC) systems.
• Operating pumps, fans, and conveyor systems.
• Use in motor starter combinations (reversing starters, star-delta starters) within the SIRIUS modular system.

Compatibility and Notes

• Coil Type: The 24 V DC coil provides precise and reliable operation.
• Surge Protection: This specific model features a captive auxiliary switch but cannot be retrofitted with an external surge suppressor (e.g., varistor, diode) due to its specific configuration. If surge suppression is required, a different model from the 3RT2 series should be selected or external suppression implemented.
• Accessories: Compatible with the extensive range of SIRIUS 3RT2 series accessories for overload protection (thermal relays), auxiliary switching, and function modules (except for surge suppressors on this specific part).

For more information on the Siemens SIRIUS 3RT2 series and our full range of industrial control products, visit turll today.