Siemens Power contactor 3-pole, 1NO + 1NC, size S2, 18.5kW Part number 3RT2035-1AL20

Product Overview

Siemens Power Contactor AC-3, 3-pole, 1NO+1NC, Size S2, 18.5 kW — the 3RT2035-1AL20 is a SIRIUS 3RT2 series power contactor designed for dependable switching and control of three-phase motors and industrial loads. With a 230 V AC coil and AC-3 rated operational current of 50 A at 400 V, it offers efficient performance in motor starter circuits, automation panels, and general load switching applications. Its integrated auxiliary contacts and compact S2 package deliver reliable operation for industrial control systems.

Key Features

• Siemens SIRIUS 3RT2 power contactor optimized for AC-3 motor switching
• 3-pole design for complete three-phase control
• Integrated auxiliary contacts: 1 NO + 1 NC
• Rated motor power up to 18.5 kW at 400 V AC
• Rated operational current (AC-3): 50 A
• Coil voltage: 230 V AC, suitable for 50/60 Hz supply
• Compact S2 frame size for space-efficient installation
• High mechanical endurance for industrial use
• Screw-terminal connections for secure wiring

Technical Specifications

• Article Number: 3RT2035-1AL20
• Product Family: SIRIUS 3RT2 Contactors
• Number of Poles: 3
• Auxiliary Contacts: 1 NO + 1 NC
• Coil Voltage: 230 V AC
• Rated Operational Current (AC-3): 50 A at 400 V
• Rated Motor Power: 18.5 kW at 400 V / 11 kW at 230 V AC
• Frame Size: S2
• Rated Insulation Voltage: 690 V
• Surge Voltage Withstand: 6 kV
• Connection Type: Screw terminals
• Mechanical Service Life: Approx. 10 million operations
• Electrical Endurance: Industrial-rated switching cycles
• Mounting: DIN rail or panel mounting
• Ambient Operating Temperature: −25 °C to +60 °C

Compliance & Certifications

• Designed according to IEC 60947 standards for low-voltage contactors
• Meets Siemens SIRIUS industrial performance requirements
• Suitable for global three-phase motor switching applications

Applications

The Siemens 3RT2035-1AL20 is suitable for switching and control of three-phase motors, pumps, fans, compressors, and general loads in industrial automation, machine control panels, and commercial electrical installations. Its integrated auxiliary contacts provide signalling and interlock capabilities, while the compact, robust S2 design ensures consistent operation in demanding environments.