Siemens Power contactor, 3-pole, 2NO+2NC, size S6, 75kW Part number 3RT1055-6AF36

Product Overview

The Siemens 3RT1055-6AF36 is a SIRIUS 3RT1 power contactor designed for robust switching and control of three-phase AC motors and industrial loads. It features a 3-pole configuration with a conventional screw terminal main circuit and auxiliary contacts, suitable for AC and DC coil operation at 110–127 V. This heavy-duty contactor is engineered to handle currents up to 150 A and motor loads up to 75 kW at 400 V AC, making it ideal for industrial motor control, automation systems, and power distribution applications.

Key Features

• SIRIUS 3RT1 power contactor, 3-pole design for reliable three-phase switching
• Rated for AC-3 load switching up to 150 A at 400 V AC, 75 kW
• Coil voltage 110 V AC / 127 V DC for versatile control operations
• Integrated auxiliary contacts: 2 normally open (NO) + 2 normally closed (NC)
• Conventional screw terminals for main and auxiliary circuits
• Long mechanical service life up to approx. 10 000 000 operating cycles
• Size S6 contactor frame for compact panel installations
• Designed for panel mounting with robust industrial performance

Technical Specifications

• Article Number: 3RT1055-6AF36
• Product Family: SIRIUS 3RT1 Power Contactors
• Number of Poles: 3
• Rated Operational Current (AC-3): 150 A at 400 V AC
• Rated Power (AC-3): 75 kW / 400 V AC
• Coil Voltage: 110 V AC / 127 V DC
• Auxiliary Contacts: 2 NO + 2 NC
• Terminal Type: Screw
• Mounting Type: Panel
• Size: S6
• Protection Class: IP00 (front), IP20 possible with cover
• Surge Voltage Resistance: Main circuit 8 kV, auxiliary 6 kV
• Insulation Voltage: 1000 V
• Mechanical Life: Approx. 10 000 000 cycles
• Operating Temperature Range: –25 °C to +60 °C

Compliance & Standards

• Designed and tested in accordance with IEC 60947-4-1 and EN 60947 standards
• Engineered to meet industrial control and motor switching requirements
• Suitable for integration in control panels, automation systems, and power distribution assemblies

Applications

The Siemens 3RT1055-6AF36 contactor is suitable for switching and controlling high-power three-phase motors, compressors, pumps, conveyors, and industrial machinery. Its robust design supports heavy-duty service in manufacturing plants, automation systems, and electrical distribution panels where reliable and durable motor control is required. The auxiliary contacts facilitate additional signaling and control logic integration within motor control centers and industrial automation schemes.