Siemens AC-3e/AC-3 Power contactor, 3-pole, 1NO+1NC, 24VDC, 18.5kW, 41A Part number 3RT2035-1KB40-1AA0

Product Overview

The Siemens 3RT2035-1KB40-1AA0 is a 3-pole AC-3e/AC-3 power contactor from the SIRIUS 3RT2 series. It is rated for 41 A operational current and 18.5 kW switching capacity at 400 V AC. Equipped with a 24 V DC control coil and integrated varistor for overvoltage protection, the unit includes 1 normally open (1 NO) and 1 normally closed (1 NC) auxiliary contact for control circuit feedback. This compact Size S2 contactor provides high reliability for motor and load switching in industrial automation and control panels.

Key Features

• 3-pole contactor rated for AC-3e/AC-3 duty up to 18.5 kW / 41 A (400 V)
• Control supply voltage: 24 V DC with integrated varistor coil protection
• Auxiliary contacts: 1 NO + 1 NC (built-in)
• Compact Size S2 frame for panel or motor control centre installations
• Durable electromechanical design with long mechanical life (~10 million operations)
• Reliable screw terminal connections and modular accessory compatibility

Technical Specifications

• Product Series: SIRIUS 3RT2 Power Contactors
• Article Number: 3RT2035-1KB40-1AA0
• Rated Operating Voltage (Ue): 400 V AC
• Rated Control Voltage (Uc): 24 V DC
• Rated Operational Current (AC-3): 41 A
• Rated Motor Power (AC-3 at 400 V): 18.5 kW
• Auxiliary Contacts: 1 NO + 1 NC (built-in)
• Rated Insulation Voltage (Ui): 690 V
• Conventional Thermal Current (Ith): 60 A at 40 °C
• Mounting Type: DIN rail or panel mounting
• Approx. Dimensions (H × W × D): 120 mm × 55 mm × 129 mm
• Approx. Weight: 0.8 kg

Compliance & Certifications

• Complies with IEC/EN 60947-4-1 and UL 508 standards
• Manufactured under Siemens SIRIUS quality assurance
• RoHS compliant

Applications

Ideal for switching and controlling three-phase motors, resistive and inductive loads in industrial automation, HVAC, conveyor systems, and general machinery. The 3RT2035-1KB40-1AA0 provides reliable performance in motor control centres and electrical distribution panels requiring AC-3 or AC-3e operation.