Siemens Power contactor, 3-pole, size S0, 1NO + 1NC, 11kW, 25A Part number 3RT2026-1KB40

Product Overview

The Siemens 3RT2026-1KB40 is a SIRIUS 3RT2 power contactor, size S0, designed for switching and controlling three-phase AC motors and general AC loads. With a 25 A contact rating and 11 kW motor capacity at 400 V (AC-3), it offers reliable performance for industrial control applications. This model features a 24 V DC coil and includes 1 NO + 1 NC auxiliary contacts, making it suitable for interlocks, signalling and control-circuit integration. Its compact footprint allows efficient use in control cabinets, motor starters and automation equipment.

Key Features

• SIRIUS 3RT2 3-pole power contactor — size S0
• Motor switching capability up to 11 kW (AC-3, 400 V)
• Main contact rating 25 A at 400 V AC
• Control coil 24 V DC
• Integrated auxiliary contacts: 1 NO + 1 NC
• Screw terminal connections for secure industrial wiring
• Compact footprint — ideal for dense control-panel layouts
• Compatible with Siemens overload relays and starter assemblies

Technical Specifications

• Article Number: 3RT2026-1KB40
• Product Type: Power contactor for motor control
• Contactor Size: S0
• Main Contacts: 3-pole
• Auxiliary Contacts: 1 NO + 1 NC
• Motor Rating: 11 kW (AC-3, 400 V)
• Rated Current: 25 A
• Coil Voltage: 24 V DC
• Terminal Type: Screw terminals
• Mounting: DIN rail / panel installation
• Protection Rating: IP20 (when mounted inside an enclosure)

Compliance & Standards

• Part of Siemens SIRIUS 3RT2 industrial contactor range
• Meets IEC/EN standards for motor switching devices
• Suitable for AC-3 motor loads and general industrial switching

Applications

Ideal for switching and controlling three-phase motors such as pumps, fans, compressors and conveyors. Also suitable for general industrial load switching, machine control systems and motor-starter combinations. The auxiliary contacts allow integration into interlock or signalling circuits, making it a reliable solution for automation panels and control systems requiring compact, high-performance contactors.