Siemens SIRIUS 3RT2026-1FB44-3MA0 Power Contactor AC-3e/AC-3, 25A, 11kW, 24V DC Coil, Screw Terminal, Size S0 Original Brand New

Overview

The Siemens SIRIUS 3RT2026-1FB44-3MA0 is a high-performance power contactor designed for switching AC-3e/AC-3 inductive loads up to 25 Amps (or $11\text{ kW}$ at $400\text{ V}$). This robust Size S0 contactor is engineered for reliability in industrial control applications. It features a low-power $24\text{ V DC}$ coil for energy efficiency, which is further enhanced by a plugged-in diode combination to suppress coil transients. The unit includes two normally open ($2\text{ NO}$) and two normally closed ($2\text{ NC}$) captive auxiliary contacts for signaling and interlocking, and uses secure screw terminals for easy wiring.

Key Function

• Motor Switching: Primarily used for the reliable starting, stopping, and reversing of 3-phase asynchronous motors.
• Load Switching: Suitable for switching non-motor loads such as heating elements and lighting systems (AC-1 duty).
• Interlocking & Signaling: The integrated $2\text{ NO}+2\text{ NC}$ captive auxiliary contacts provide essential feedback for control systems and can be used to interlock other devices.
• Transient Suppression: The pre-installed diode combination protects the control circuit from voltage spikes when the $24\text{ V DC}$ coil is de-energized.

Benefit

• Exceptional Reliability: Part of the industry-leading Siemens SIRIUS modular system, ensuring long-term operational performance and minimal downtime.
• Energy Efficient Control: The $24\text{ V DC}$ coil provides low power consumption compared to AC-operated coils.
• Simplified Installation: Secure screw terminals are easy to wire and maintain, providing a strong, vibration-resistant connection.
• Space-Saving Design: The compact Size S0 footprint is optimized for use in crowded control cabinets.
• Complete Feedback: The integrated $2\text{ NO}+2\text{ NC}$ auxiliary switch configuration reduces the need for external components, simplifying the overall system design.

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