Siemens Power contactor, 3-pole, 2NO + 2NC, 400VAC, 75kW, 150A Part number 3RT1055-6AB36

Product Overview

The Siemens 3RT1055-6AB36 is a SIRIUS 3RT1-series 3-pole power contactor (size S6) with a 23-26 V AC/DC control coil. It is designed for heavy-duty switching of three-phase motors and loads, providing robust AC-3/AC-3e switching performance, suitable for industrial power distribution and motor control applications.

Key Features

• 3-pole power contactor, size S6
• Rated operational current: 150 A (AC-3, 400 V AC)
• Motor switching capacity: up to 75 kW at 400 V AC
• Control coil voltage: 23 … 26 V AC/DC
• Auxiliary contacts: 2 NO + 2 NC (integrated)
• Screw-terminal connections for main, control and auxiliary circuits
• Busbar or conventional main circuit connection possible
• High insulation and surge-voltage resistance for industrial environments (insulation 1,000 V; surge withstand 8 kV)
• Long mechanical service life — up to 10,000,000 switching cycles typical

Technical Specifications

• Article Number: 3RT1055-6AB36
• Product Family: SIRIUS 3RT1 power contactors
• Contactor Size: S6
• Number of Poles: 3 (3-pole main contacts)
• Main Contact Configuration: 3 × Normally Open (NO)
• Auxiliary Contacts: 2 NO + 2 NC (instantaneous contacts)
• Rated Operational Current (AC-3, 400 V): 150 A
• Rated Motor Power (AC-3, 400 V): 75 kW
• Control Coil Voltage: 23 … 26 V AC/DC
• Rated Insulation Voltage (Ui): 1,000 V
• Surge Voltage Withstand (Uimp): 8 kV
• Mechanical Service Life (Typical): 10,000,000 cycles
• Mounting / Connection: Busbar or conventional wiring; screw terminals for all circuits
• Protection Class (terminals): IP00 (standard terminal layout) / depending on housing or cover
• Ambient Operating Temperature: –25 °C … +60 °C

Compliance & Certifications

• Designed to international IEC / EN standards for low-voltage power contactors (IEC 60947-1 / 60947-4).
• High insulation and surge-voltage ratings make it suitable for heavy industrial environments.
• Part of the modular SIRIUS 3RT1 family — compatible with related accessories and power distribution assemblies.

Applications

The 3RT1055-6AB36 is ideal for heavy-duty motor control and power distribution in industrial settings. Typical applications include motor feeders, conveyor systems, pumps, compressors, HVAC units, and large three-phase load switching. Its robust design, high current and power ratings, and versatile connection options make it suitable for main feeders, sub-distribution panels, and machine-control cabinets where high reliability and long service life are required.