Siemens SIRIUS 3RT2026-1BJ80 Power Contactor, 25A, 11kW, 72V DC, S0 Original Brand New

Overview

The Siemens SIRIUS 3RT2026-1BJ80 is a high-performance, 3-pole power contactor designed for reliable switching of electric motors and other resistive loads in industrial control and automation systems. Part of the compact SIRIUS 3RT2 family, this device is engineered for maximum operational reliability and long service life.

It features an operating current of 25 A ($\text{AC-3e/AC-3}$) and a rated power of 11 kW at 400 V, making it ideal for standard motor applications. The integrated 72 V DC coil ensures efficient and responsive control, while the robust screw terminals simplify wiring and ensure secure connections.

Benefit & Features

1. High Reliability & Durability: Engineered to meet $\text{AC-3e/AC-3}$ switching requirements, offering a long mechanical and electrical service life for demanding industrial environments.
2. Space-Saving Design (Size S0): Compact footprint allows for efficient use of space in control cabinets and panels.
3. Integrated Auxiliary Contacts: Comes standard with $1\text{ NO}$ (Normally Open) and $1\text{ NC}$ (Normally Closed) auxiliary contacts for feedback, interlocking, and control circuit applications, reducing the need for add-on modules.
4. Robust Connection: Secure and widely used screw terminals ensure reliable wiring, minimizing downtime during installation and maintenance.
5. Efficient $\text{DC}$ Coil: The 72 V DC coil provides reliable performance and can be integrated seamlessly into existing DC control systems.
6. Full Compatibility: Fully compatible with a comprehensive range of SIRIUS components, including auxiliary switch blocks, overload relays (e.g., 3RU2), and electronic accessories for flexible system expansion.

Function

The Siemens 3RT2026-1BJ80 functions as the primary switching element in motor control circuits. When the 72 V DC control voltage is applied to the coil, it magnetically closes the three main power contacts, allowing the $25\text{ A}$ (or $11\text{ kW}$) current to flow to the connected $3$-phase motor or load. Simultaneously, the $1\text{ NO}$ and $1\text{ NC}$ auxiliary contacts change state, providing feedback to the PLC or control system and enabling safety interlocks. It is the essential component for:

• Switching 3-phase AC motors on and off.
• Controlling resistive loads (e.g., heating elements).
• Integration into complex motor starter assemblies (in conjunction with an overload relay).

Application

This power contactor is a standard device for a vast array of industrial and commercial applications, including:

• Pump and Fan Control
• Conveyor Systems
• Compressor Control
• Machine Tools
• HVAC and Refrigeration Systems
• General Industrial Motor Switching

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