The Siemens 3RT1056-6AV36 (MLFB: 3RT1056-6AV36) is a SIRIUS 3RT1 series power contactor rated for AC-3e/AC-3 duty at 185 A and 90 kW / 400 V. It features a 3-pole main circuit with 2 NO + 2 NC auxiliary contacts and a conventional drive coil rated 380-420 V AC/DC.

Technical specifications:

• MLFB: 3RT1056-6AV36
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Power contactor (3RT1)
• Contactor size: S6
• Number of main poles: 3
• Rated operational current AC-3 at 400 V: 185 A
• Rated operational current AC-3 at 690 V: 170 A
• Rated operational current AC-1 at 400 V / 40 C: 215 A
• Rated operating power AC-3 at 400 V: 90 kW
• Rated operating power AC-3 at 690 V: 160 kW
• Control voltage (Uc): 380-420 V AC (50-60 Hz) / DC
• Auxiliary contacts: 2 NO + 2 NC
• Main circuit insulation voltage: 1,000 V
• Auxiliary circuit insulation voltage: 500 V
• Main circuit surge voltage resistance: 8 kV
• Main circuit connection: busbar
• Control and auxiliary circuit connection: screw terminal
• Mechanical service life: 10,000,000 operating cycles
• Operating temperature: -25 … +60 C
• Storage temperature: -55 … +80 C
• Maximum installation altitude: 2,000 m above sea level
• Power loss at rated AC current (hot): 39 W
• Net weight: 3.35 kg

Features and benefits:

• Size S6 frame supports high-current motor switching up to 185 A AC-3 without derating up to 500 V
• Integrated 2 NO + 2 NC auxiliary contacts eliminate the need for an additional auxiliary switch block in many applications
• Busbar main terminals simplify connection in high-current panel assemblies
• Wide operating temperature range (-25 … +60 C) suits demanding industrial environments
• 10,000,000 cycle mechanical service life reduces maintenance intervals
• Protective separation rated to 690 V between coil and main contacts per EN 60947-1

Applications:

• Direct-on-line starting of large AC motors up to 90 kW at 400 V
• Motor switching duties in industrial drives and pump stations
• High-current load switching in power distribution and control panels
• AC-4 reversing or plugging duty for heavy motor loads (160 A at 400 V)
• Capacitor bank switching at AC-6a up to 690 V

Compliant with EN/IEC 60947-4-1 for contactors and motor starters. Part of the Siemens SIRIUS 3RT1 range.

Also known as: Siemens 3RT1056-6AV36, SIRIUS 3RT1 power contactor 185A, Siemens S6 contactor 90kW.