Siemens SIRIUS 3RT2026-1BB44-3MA0 Power Contactor, 25A, 11kW, 24V DC Coil Original Brand New

Overview: Siemens 3RT2026-1BB44-3MA0 Power Contactor

The Siemens 3RT2026-1BB44-3MA0 is a high-performance SIRIUS series power contactor designed for reliable switching of motors and industrial loads up to $\text{25 A}$ ($\text{11 kW}$ at $\text{400 V}$, $\text{AC-3e/AC-3}$). This 3-pole contactor features a $24\text{ V DC}$ control voltage for seamless integration into modern automation systems.

It is constructed in the compact Size $\text{S0}$ and utilizes secure screw terminals for main and auxiliary circuits. A critical feature of the -3MA0 variant is the inclusion of a captive auxiliary switch block ($\text{2 NO}+\text{2 NC}$ contacts), making it suitable for safety-related applications, such as those requiring $\text{SUVA}$ certification, by preventing the accidental removal of the auxiliary contacts. Note that this specific model does not support the retrofitting of a surge suppressor.

Key Benefit & Advantages

• High Performance: Rated for $25\text{ A}$ current and $\text{11 kW}$ motor control at $400\text{ V}$ ($\text{AC-3}$).
• Safety Integration: Includes a captive auxiliary switch ($\text{2 NO}+\text{2 NC}$) essential for specific safety functions and compliance.
• Reliable DC Control: $24\text{ V DC}$ coil ensures quick and reliable switching operations in $\text{DC}$ control circuits.
• Robust & Compact: $\text{S0}$ frame size offers high power density for efficient panel space utilization.
• Secure Connection: Proven screw terminal technology guarantees a durable and vibration-proof electrical connection.
• Industrial Standard: Part of the globally recognized Siemens SIRIUS family, ensuring quality and compatibility.

Functionality & Application

The 3RT2026-1BB44-3MA0 contactor is primarily used for switching 3-phase AC motors and resistive loads in various industrial and commercial settings. Its applications include:

• Direct-on-line (DOL) motor starters.
• Controlling heating, ventilation, and air conditioning ($\text{HVAC}$) systems.
• Switching lighting loads and power circuits.
• Integration into machine control panels and starter assemblies requiring a $24\text{ V DC}$ control signal.

Technical Specification

• Type: Power Contactor
• Product Series: SIRIUS 3RT2
• Rated Operational Current ($\text{AC-3}$): $25\text{ A}$
• Rated Power ($\text{400 V}$): $11\text{ kW}$
• Number of Poles: 3-pole
• Control Coil Voltage: $24\text{ V DC}$
• Auxiliary Contacts: $\text{2 NO}+\text{2 NC}$ (Captive/Permanently Mounted)
• Size: $\text{S0}$
• Connection Type: Screw Terminal
• Surge Suppressor: Not retrofittable on this specific model.

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