Siemens 3RT2038-1KB40 SIRIUS Power Contactor 80A 37kW 24V DC 3P

The Siemens 3RT2038-1KB40 is a SIRIUS 3RT2 series power contactor rated at 80 A / 37 kW at 400 V (AC-3/AC-3e), 3-pole, with a 24 V DC control coil. Frame size S2, it includes an integrated varistor for coil surge suppression and is suitable for direct PLC output control.

Technical specifications:

• MLFB: 3RT2038-1KB40
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Power contactor (3RT2)
• Frame size: S2
• Number of poles (main circuit): 3
• Rated operational current AC-3 at 400 V: 80 A
• Rated operational current AC-3 at 690 V: 58 A
• Rated operational current AC-1 at 400 V / 40 °C: 90 A
• Rated operational power AC-3 at 400 V: 37 kW
• Rated operational power AC-3 at 690 V: 45 kW
• Control supply voltage: 24 V DC
• Operating range: 0.8-1.2 x Uc
• Auxiliary contacts: 1 NO + 1 NC
• Surge suppressor: integrated varistor
• Terminal type: screw terminal
• Insulation voltage (main and auxiliary circuit): 690 V
• Surge voltage resistance: 6 kV
• Mechanical service life: 10,000,000 operating cycles
• Operating temperature: -25 ... +60 °C
• Maximum installation altitude: 2,000 m
• Net weight: 1.122 kg

Features and benefits:

• Integrated varistor eliminates the need for an external coil surge suppressor
• 24 V DC coil with 0.8-1.2 x Uc operating range allows direct connection to PLC outputs
• 1 NO + 1 NC auxiliary contacts built in, reducing need for add-on blocks
• 10 million cycle mechanical service life for high-duty applications
• Suitable for AC-3, AC-3e, AC-4, and DC switching duties across a wide voltage range up to 690 V

Applications:

• Direct-on-line starting and switching of three-phase motors up to 37 kW at 400 V
• PLC-controlled motor circuits requiring low-power 24 V DC coil actuation
• Industrial machinery and conveyor systems with frequent switching cycles
• Pump and fan control in building services and process automation

Compliant with EN/IEC 60947-4-1 for power contactors. Part of the Siemens SIRIUS 3RT2 range.

Also known as: Siemens 3RT2038-1KB40, SIRIUS 3RT2 power contactor 80 A 24 V DC.