Siemens 3RT2026-1BB44 Power Contactor SIRIUS S0, 25A, 11kW, 24V DC Original Brand New

Overview

The Siemens 3RT2026-1BB44 is a high-performance 3-pole power contactor from the globally recognized SIRIUS 3RT2 family. Engineered for reliable switching of electric motors and other loads, this robust device is rated for an operational current of 25 A (AC-3e/AC-3) and a motor power of up to 11 kW at 400 V. It features a 24 V DC control supply voltage for integration into modern automation systems and comes equipped with a versatile configuration of auxiliary contacts: 2 Normally Open (NO) and 2 Normally Closed (NC). Its compact Size S0 and secure screw terminals make it an ideal choice for efficient panel design and reliable wiring. A key feature is the removable auxiliary switch block for enhanced flexibility.

Benefit

1. High Reliability & Durability: Part of the SIRIUS modular system, ensuring high contact reliability and a long mechanical service life of up to 10 million operating cycles.
2. Space Efficiency: Compact S0 size allows for significant space savings in control cabinets and machine panels.
3. Versatile Control Integration: The 24 V DC coil voltage is standard for integration into PLC-controlled and modern low-voltage automation systems.
4. Flexible Monitoring: Integrated 2 NO + 2 NC auxiliary contacts provide ample feedback and interlocking options for complex control circuits.
5. Easy Installation & Maintenance: Secure screw terminals and the removable auxiliary switch simplify wiring, maintenance, and replacement procedures.
6. Global Standard Compliance: IEC and UL/CSA approved, making it suitable for worldwide applications.

Function

The Siemens 3RT2026-1BB44 power contactor serves as an electrically operated switch for the main circuit of a motor load. When the 24 V DC control voltage is applied to the coil, it electromagnetically closes the three main power contacts, supplying electricity to the connected motor (up to 11 kW).

When the voltage is removed, the contacts open, safely isolating the motor from the power supply. The integral $2\text{ NO}+2\text{ NC}$ auxiliary contacts switch simultaneously, providing feedback to the control system (e.g., PLC input) or enabling safety interlocks within the control circuit.

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