Siemens SIRIUS 3RT2 Power Contactor 3RT2025-2FB44-3MA0 17A, 7.5kW, 24V DC Coil, Spring Terminal, Size S0 Original Brand New

Overview

The Siemens SIRIUS 3RT2025-2FB44-3MA0 is a compact, high-performance 3-pole power contactor from the globally recognized SIRIUS modular system. Designed for switching motors and other loads up to 17 A (AC-3) or 7.5 kW at 400 V, this contactor offers exceptional reliability and a long mechanical service life.

It features an energy-efficient 24 V DC control coil with a pre-installed plugged-in diode combination for enhanced surge suppression, protecting sensitive electronics. The unit is built in the standard Size S0 and is equipped with fast, vibration-proof spring-loaded terminals for quick and secure wiring.

Key Features and Technical Specification

• Product ID: 3RT2025-2FB44-3MA0
• Brand: Siemens SIRIUS 3RT2
• Contactor Type: Power Contactor (AC-3e/AC-3)
• Rated Operating Current (Ie): 17 A (at 400 V, AC-3)
• Rated Power (Pe): 7.5 kW (at 400 V)
• Poles: 3-pole
• Control Coil Voltage (Us): 24 V DC
• Auxiliary Contacts: 2 NO (Normally Open) + 2 NC (Normally Closed)
• Auxiliary Switch: Captive auxiliary switch (ideal for SUVA applications)
• Surge Suppression: Plugged-in diode combination
• Connection Type: Spring-loaded terminal (Spring-type terminal)
• Contactor Size: S0
• Insulation Voltage (Ui): 690 V
• Mechanical Service Life: Up to 10 million operating cycles

Benefit

• Reliable Motor Control: Rated for $17\text{ A}$ and $7.5\text{ kW}$ for demanding AC-3 motor switching applications.
• Fast & Secure Wiring: Innovative spring-loaded terminals significantly reduce wiring time and maintenance by providing a reliable, vibration-proof connection without the need for periodic retightening.
• Enhanced Coil Protection: The integrated diode combination absorbs voltage peaks, prolonging the life of the contactor and protecting control circuit components.
• Safety Integrated: Features a captive auxiliary switch block (2 NO + 2 NC) which is permanently fixed and critical for safety applications (e.g., SUVA compliant machinery).
• Compact Design: The Size S0 footprint allows for space-saving installation in control cabinets, maximizing panel density.
• Global Standard: Part of the widely adopted Siemens SIRIUS modular system, ensuring compatibility and availability of accessories.

Typical Application

The Siemens 3RT2025-2FB44-3MA0 contactor is the ideal choice for a wide range of industrial control and automation tasks, including:

• Switching of three-phase squirrel-cage motors (DOL starting).
• Control of lighting systems.
• Switching resistive loads.
• Integration into complex motor starter combinations (in conjunction with thermal overload relays or circuit breakers).
• Applications requiring certified safety switching (due to the captive auxiliary switch).

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