Siemens Contactor assembly kit for AC-3 Star-Delta, 690VAC Part number 3RA2435-8XF32-1NB3

Product Overview

The Siemens 3RA2435-8XF32-1NB3 is a pre-assembled SIRIUS star-delta (wye-delta) contactor combination designed for soft motor starting in three-phase industrial systems. It is engineered for AC-3 applications up to 37 kW at 400 V and includes integrated electrical and mechanical interlocking. The assembly uses screw-terminal wiring and operates on a 24–33 V AC/DC control supply.

Key Features

• Complete star-delta contactor assembly for SIRIUS motor-starter applications
• Rated for AC-3 duty up to 37 kW at 400 V
• Control voltage range: 24–33 V AC/DC
• Includes electrical and mechanical interlocking for safe changeover
• 3-pole main contactors with coordinated auxiliary contacts
• Screw terminals for secure main and control wiring
• Compact S2 size suitable for industrial control panels

Technical Specifications

• Article Number: 3RA2435-8XF32-1NB3
• Product Type: Star-delta (wye-delta) contactor assembly
• Operational Duty: AC-3, 37 kW at 400 V
• Control Voltage (Us): 24–33 V AC/DC
• Main Poles: 3
• Frame Size: S2
• Auxiliary Contacts: 3 NO + 3 NC
• Connection Type: Screw terminals
• Rated Insulation Voltage (Ui): 690 V

Compliance & Certifications

• Manufactured under Siemens SIRIUS low-voltage control gear standards
• Designed in accordance with IEC/EN requirements for motor-starter assemblies

Applications

Used for starting large three-phase motors using a star-delta method to reduce starting current and mechanical stress. Suitable for pumps, compressors, fans, conveyors and heavy-duty industrial machinery. Ideal for control cabinets and motor-starter panels requiring a compact and reliable star-delta solution up to 37 kW.