Siemens 3RT2035-1KB40 Power Contactor 3P 41A 18.5kW 24V DC

The Siemens 3RT2035-1KB40 is a SIRIUS frame S2 3-pole power contactor rated at 41 A and 18.5 kW at 400 V under AC-3e/AC-3 duty. The 24 V DC coil operates across 0.8-1.2 x Uc and includes an integrated varistor, making it suitable for direct connection to PLC outputs. Auxiliary contacts of 1 NO + 1 NC and screw terminals are included as standard.

Technical specifications:

• MLFB: 3RT2035-1KB40
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type designation: 3RT2
• Frame size: S2
• Poles: 3
• Rated current AC-3/AC-3e at 400 V: 41 A
• Rated current AC-1 at 400 V (40 °C): 60 A
• Rated current AC-3/AC-3e at 690 V: 24 A
• Operating power AC-3 at 400 V: 18.5 kW
• Operating power AC-3 at 500 V: 22 kW
• Maximum operating voltage: 690 V
• Insulation voltage: 690 V
• Surge voltage resistance: 6 kV
• Control supply voltage: 24 V DC
• Coil operating range: 0.8-1.2 x Uc
• Surge suppressor: integrated varistor
• Auxiliary contacts: 1 NO + 1 NC
• Terminal type: screw terminal
• Ambient temperature (operation): -25 to +60 °C
• Installation altitude: max 2000 m
• Mechanical service life: 10,000,000 operating cycles
• Operating frequency at AC-3: max 1000 /h
• Net weight: 1.114 kg

Features and benefits:

• Integrated varistor suppresses coil switching transients without an external component
• 24 V DC coil with 0.8-1.2 x Uc tolerance connects directly to PLC digital outputs
• 10,000,000 mechanical operating cycles for high-duty switching environments
• Wide ambient temperature range of -25 to +60 °C covers demanding installation conditions
• AC-4 current rating of 35 A at 400 V supports high-demand switching duty

Applications:

• Switching three-phase motors up to 18.5 kW at 400 V under AC-3/AC-3e duty
• PLC-controlled motor circuits driven by 24 V DC digital outputs
• High-cycle industrial automation systems requiring up to 1000 switching operations per hour
• DC load switching using multi-pole series current path configurations

Compliant with EN 60947-1 and IEC 60068-2-30. Part of the Siemens SIRIUS 3RT2 range.

Also known as: Siemens 3RT2035-1KB40, SIRIUS 3RT2 power contactor 41A, Siemens S2 contactor 24V DC.