SIEMENS SIRIUS 3RT2026-1BB44 Contactor, 3-pole, 25 A, 11 kW, 24 V DC coil, screw terminals

Industrial motor control demands components that combine reliable switching, compact dimensions, and long service life. The SIEMENS SIRIUS 3RT2026-1BB44 contactor answers this need with a robust 3-pole design rated for 11 kW at 400 V AC-3, making it ideal for controlling three-phase motors up to 25 A. Its 24 V DC coil allows direct integration into PLC-driven automation systems, while screw-type terminals ensure secure, maintenance-friendly wiring. Part of the proven SIRIUS 3RT20 series, this size S0 contactor fits standard 35 mm DIN rails or can be screw-mounted, offering flexibility in panel layout. With IP20 finger-safe protection and compliance with IEC/EN 60947, it delivers dependable performance in industrial environments.

Who is it for

This contactor is built for electrical engineers, panel builders, and maintenance technicians who need a compact, high-performance switching solution for motor starters, heating circuits, or auxiliary control systems. It is particularly suited for applications where 24 V DC control voltage is standard, such as in machine tools, conveyors, pumps, and HVAC equipment. Its S0 size and DIN-rail mounting make it a drop-in replacement for many existing installations, reducing downtime during upgrades or repairs.

Main features

• 3 main poles (NO) with 1 NO + 1 NC auxiliary contacts for control and signaling
• Rated operational current of 25 A (AC-3, 400 V) and 11 kW motor power
• 24 V DC coil for direct PLC compatibility and low-voltage control circuits
• Screw-type terminals for secure, vibration-resistant connections
• Compact S0 size with DIN rail (35 mm) or screw mounting options
• IP20 protection on terminals, finger-safe per IEC 60529
• High mechanical endurance of 30 million cycles and electrical endurance of 10 million cycles (AC-3)
• Wide ambient temperature range from -25 °C to +60 °C
• Complies with IEC 60947 and EN 60947 standards

Specifications

• Brand: SIEMENS
• Model: 3RT2026-1BB44
• MPN: 3RT20261BB44
• EAN: 4011209837492
• Product series: SIRIUS 3RT20
• Contactor size: S0
• Utilization category: AC-3
• Rated operational power (AC-3, 400 V): 11 kW
• Rated operational current (AC-3, 400 V): 25 A
• Control supply voltage (coil): 24 V DC
• Number of main contacts (NO): 3
• Number of auxiliary contacts: 1 NO + 1 NC
• Connection type: Screw-type terminals
• Mounting type: DIN rail (35 mm) / screw mounting
• Degree of protection: IP20
• Rated insulation voltage: 690 V
• Electrical endurance (AC-3): 10 million switching cycles
• Mechanical endurance: 30 million switching cycles
• Ambient operating temperature: -25 to +60 °C
• Standards: IEC 60947, EN 60947
• Surge voltage resistance: 6 kV

Tips

For optimal performance, ensure the control voltage matches the 24 V DC coil rating and use appropriate wire ferrules with the screw terminals. When mounting on a DIN rail, leave adequate spacing for heat dissipation and access to terminals. In high-vibration environments, consider additional mechanical support or use the screw-mounting option. Regularly inspect and tighten terminal screws as part of preventive maintenance to maintain reliable connections.