Siemens 3RT2037-1KB40 SIRIUS Power Contactor 65A 30kW 24V DC 3-pole

The Siemens 3RT2037-1KB40 is a SIRIUS 3RT2 series power contactor rated at 65 A and 30 kW at 400 V, designed for AC-3e/AC-3 motor switching applications. The 3-pole, frame size S2 unit operates on a 24 V DC control supply with a 0.8-1.2 Uc operating range and includes an integrated varistor for coil surge suppression. It is suitable for direct connection to PLC outputs.

Technical specifications:

• MLFB: 3RT2037-1KB40
• 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: 65 A
• Rated operational current AC-1 at 400 V / 40°C: 80 A
• Rated power AC-3 at 400 V: 30 kW
• Rated power AC-3 at 690 V: 37 kW
• Operating voltage (main circuit): up to 690 V AC
• Control supply voltage: 24 V DC
• Operating range: 0.8-1.2 x Uc
• Surge suppressor: Integrated varistor
• Auxiliary contacts: 1 NO + 1 NC
• Terminal type: Screw terminal
• Insulation voltage (main and auxiliary circuit): 690 V (pollution degree 3)
• Surge voltage resistance: 6 kV
• Ambient operating temperature: -25 to +60°C
• Storage temperature: -55 to +80°C
• Installation altitude: max. 2000 m above sea level
• Mechanical service life: 10,000,000 operating cycles
• Net weight: 1.12 kg

Features and benefits:

• Integrated varistor enables direct connection to PLC outputs without external suppression
• Wide operating temperature range (-25 to +60°C) suits demanding industrial environments
• 10 million mechanical operating cycles ensure long service life
• Operating range of 0.8-1.2 x Uc provides tolerance to supply voltage fluctuations
• AC-3e rating allows energy-optimised operation for reduced power loss
• Combined 1 NO + 1 NC auxiliary contact block supports signalling and interlocking circuits

Applications:

• Direct-on-line starting and switching of three-phase motors up to 30 kW at 400 V
• PLC-controlled motor circuits requiring direct coil connection without additional interface relays
• Industrial machinery and conveyor drives operating within AC-3 duty cycles
• Pump and fan applications requiring reliable switching at up to 690 V

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

Also known as: Siemens 3RT2037-1KB40, SIRIUS 3RT2 contactor 65A, Siemens S2 power contactor 24V DC.