Siemens SIRIUS 3RT2017-2KB42-0LA0 Traction Contactor, 12A, 5.5kW, 24V DC Coil, Size S00, Spring Terminal Original Brand New

Overview

The Siemens SIRIUS 3RT2017-2KB42-0LA0 is a robust, 3-pole traction contactor specifically designed for demanding applications, such as railway and extreme industrial environments. Part of the compact SIRIUS 3RT2 series, this contactor features a 24V DC control voltage with an extended operating range (0.7−1.25×Uc​) and an integrated suppressor diode for coil protection. Rated for 12 A (AC-3e/AC-3) and 5.5 kW at 400 V, it comes in a compact Size S00 and utilizes reliable spring-loaded terminals for fast, vibration-proof wiring. Includes 1 NC auxiliary contact and a plugged-on series resistor for optimal performance with PLC outputs.

Key Features & Specification

• Type: Traction Contactor (SIRIUS 3RT2 Series)
• Pole: 3-pole
• Operating Current (AC-3e/AC-3): 12 A
• Rated Power (400V): 5.5 kW
• Control Voltage: 24 V DC
• Control Voltage Range: $0.7$ to 1.25×Uc​ (Extended)
• Auxiliary Contacts: 1 NC (Normally Closed)
• Termination: Spring-loaded terminal
• Size: S00
• Special Features: Integrated suppressor diode, Plugged-on series resistor (for PLC output suitability)
• Manufacturer: Siemens

Function

The 3RT2017-2KB42-0LA0 functions as an electrically operated switch for a main circuit. When the 24V DC coil is energized, the 3 main power contacts close, allowing power to flow to a connected load, typically a 3-phase motor. The AC-3e/AC-3 rating confirms its suitability for switching squirrel-cage motors during operation, which is the standard duty for industrial contactors. The inclusion of the 1 NC auxiliary contact allows the contactor to be integrated into a wider control scheme for status monitoring or safety interlocking.

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