Siemens Power contactor AC-3, 3-pole, 1NO+1NC, size S2, 30kW Part number 3RT2037-1AL20

Product Overview

Siemens Power Contactor AC-3, 3-pole, 1NO+1NC, Size S2, 30 kW — the 3RT2037-1AL20 is a SIRIUS 3RT2 power contactor designed for switching and controlling three-phase motors and industrial loads. Equipped with a 230 V AC coil and rated for AC-3 operation up to 65 A at 400 V, it provides robust, reliable performance in motor starter combinations, automation panels, and industrial machinery. Its compact S2 design, integrated auxiliary contacts, and high switching endurance make it suitable for demanding electrical environments.

Key Features

• Siemens SIRIUS 3RT2 power contactor for AC-3 motor switching
• 3-pole configuration for three-phase applications
• Integrated auxiliary contacts: 1 NO + 1 NC
• Rated motor power: 30 kW at 400 V AC
• Rated operational current (AC-3): 65 A
• Coil voltage: 230 V AC, 50/60 Hz
• Compact size S2 for efficient control panel installation
• High mechanical durability for long service life
• Screw terminals for secure conductor connection

Technical Specifications

• Article Number: 3RT2037-1AL20
• 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): 65 A at 400 V
• Rated Motor Power: 30 kW at 400 V / 18.5 kW at 230 V
• Rated Insulation Voltage: 690 V
• Surge Withstand Voltage: 6 kV
• Frame Size: S2
• Connection Type: Screw terminals
• Mechanical Endurance: approx. 10 million operations
• Electrical Endurance: Industrial-rated switching cycles
• Mounting: DIN rail or panel mounting
• Operating Temperature Range: −25 °C to +60 °C

Compliance & Certifications

• Designed according to IEC 60947 for low-voltage switching devices
• Meets Siemens SIRIUS standards for industrial durability and reliability
• Suitable for global AC-3 motor switching applications

Applications

The Siemens 3RT2037-1AL20 is ideal for switching and controlling motors, pumps, fans, compressors, and industrial loads in automation systems, machinery, and commercial installations. Its auxiliary contacts support signalling and interlocking, while the robust S2 frame ensures consistent operation in harsh industrial environments.