Siemens Power contactor, 3-pole, 2NO+2NC, 185A, 90kW, 400VAC Part number 3RT1056-6AF36

Product Overview

The Siemens 3RT1056-6AF36 is a SIRIUS 3RT1 power contactor designed for heavy-duty switching and control of three-phase motors and industrial electrical loads. This size S6, 3-pole contactor is rated for AC-3e / AC-3 motor duty up to 185 A and supports motor outputs up to 90 kW at 400 V AC. It features an AC/DC control coil rated at 110–127 V and includes integrated auxiliary contacts for control and signalling purposes. Built for high reliability and long service life, the 3RT1056-6AF36 is suitable for demanding industrial motor control and automation applications.

Key Features

• SIRIUS 3RT1 heavy-duty power contactor
• 3-pole main circuit with normally open (NO) main contacts
• Rated for AC-3e / AC-3 motor switching duty
• Operational current up to 185 A at 400 V AC
• Motor power rating up to 90 kW at 400 V AC
• AC/DC control coil rated at 110–127 V (50/60 Hz AC and DC)
• Integrated auxiliary contacts: 2 NO + 2 NC (instantaneous)
• Main circuit busbar connection for high-current applications
• Screw terminals for control and auxiliary circuits
• Size S6 frame for industrial panel installations
• High mechanical endurance for frequent switching operations

Technical Specifications

• Article Number: 3RT1056-6AF36
• Product Family: SIRIUS 3RT1 Power Contactors
• Contactor Size: S6
• Number of Poles: 3
• Main Contacts: 3 NO
• Rated Operational Voltage: up to 1000 V AC
• Rated Operational Current:
• AC-3 / AC-3e: 185 A at 400 V AC
• AC-1: 215 A at 40 °C (up to 690 V)
• AC-4: 160 A at 400 V AC
• Motor Power Rating (AC-3 / AC-3e):
• 55 kW at 230 V AC
• 90 kW at 400 V AC
• 132 kW at 500 V AC
• 160 kW at 690 V AC
• 90 kW at 1000 V AC
• Control Supply / Coil: AC/DC
• Rated coil voltage: 110–127 V AC (50/60 Hz) / DC
• Operational voltage range: approx. 0.8 to 1.1 × rated voltage
• Integrated surge suppression: Varistor
• Auxiliary Contacts: 2 NO + 2 NC (instantaneous)
• Utilization Category: AC-15: 6 A at 230 V, 3 A at 400 V
• Utilization Category: DC-13: 2.5 A at 24 V
• Connection Type:
• Main circuit: Busbar connection
• Control and auxiliary circuits: Screw terminals
• Rated Insulation Voltage:
• Main circuit: 1000 V
• Auxiliary circuit: 500 V
• Surge Withstand Voltage:
• Main circuit: 8 kV
• Auxiliary circuit: 6 kV
• Power Loss: approx. 39 W at rated current (hot state)
• Mechanical Endurance: approx. 10,000,000 operating cycles
• Environmental Conditions:
• Operating temperature: –25 °C to +60 °C
• Storage temperature: –55 °C to +80 °C
• Installation altitude: up to 2000 m above sea level
• Degree of Protection: IP00 (front); IP20 with cover
• Net Weight: approx. 3.36 kg

Compliance & Standards

• Designed in accordance with IEC and EN 60947-4-1 standards for contactors and motor starters
• Complies with Siemens requirements for low-voltage industrial switching devices
• Suitable for integration into low-voltage switchgear and control gear assemblies

Applications

The Siemens 3RT1056-6AF36 power contactor is used for switching and controlling high-power three-phase motors and industrial loads such as pumps, compressors, conveyors, fans, HVAC equipment, and process machinery. It is commonly installed in motor control centers (MCCs), automation panels, and industrial power distribution systems where high current capacity, long service life, and reliable auxiliary signalling are required.