Siemens Power contactor, 3-pole, 15kW, 24VDC, 32A Part number 3RT2027-1KB40

Product Overview

The Siemens 3RT2027-1KB40 is a SIRIUS 3RT series 3-pole power contactor (size S0) with a 24 V DC control coil and integrated varistor. It is designed for switching motors and resistive loads up to 15 kW at 400 V AC. Its compact design, high switching reliability and integrated auxiliary contacts make it ideal for use in industrial control panels and motor starter assemblies.

Key Features

• 3-pole power contactor, size S0
• Rated operational current: 32 A (AC-3, 400 V)
• Motor switching capacity up to 15 kW at 400 V AC
• 24 V DC control voltage
• Integrated varistor for coil surge suppression
• Auxiliary contacts: 1 NO + 1 NC
• Screw terminals for main and control connections
• High mechanical switching endurance
• Suitable for DIN rail or screw mounting

Technical Specifications

• Article Number: 3RT2027-1KB40
• Product Family: SIRIUS 3RT Contactors
• Contactor Size: S0
• Number of Poles: 3
• Main Contact Configuration: 3 × Normally Open (NO)
• Control Voltage: 24 V DC
• Rated Operational Current (AC-3, 400 V): 32 A
• Rated Motor Power (AC-3, 400 V): 15 kW
• Rated Operational Voltage: up to 690 V AC
• Auxiliary Contacts: 1 NO + 1 NC
• Terminal Type: Screw terminals
• Mechanical Endurance: approx. 10,000,000 switching cycles
• Insulation Voltage (Ui): 690 V AC
• Surge Voltage Withstand (Uimp): 6 kV
• Ambient Operating Temperature: −25 °C … +60 °C
• Mounting: DIN rail 35 mm or screw mounting
• Weight (approx.): 0.61 kg

Compliance & Certifications

• Designed according to international low-voltage contactor standards
• Integrated coil protection for surge resistance in industrial control environments
• Suitable for industrial, commercial and automation control applications

Applications

The Siemens 3RT2027-1KB40 is commonly used for motor switching in industrial automation systems. Typical applications include control of motors in pumps, fans, compressors, conveyor systems and machine tools. It is also ideal for use in PLC-controlled motor starter panels, building automation panels and control cabinets where compact size, high reliability and integrated protection components are required.