Siemens 3RT2017-1VB42 SIRIUS Power Contactor, 12A, 5.5kW, 3-Pole, 24V DC Coil, S00 Original Brand New

Overview

The Siemens 3RT2017-1VB42 is a compact, high-performance SIRIUS power contactor designed for switching motors and general loads up to 12 A (AC-3e/AC-3) or 5.5 kW at 400 V. Part of the globally renowned SIRIUS modular system (3RT2 series), this 3-pole contactor is engineered for efficiency, reliability, and easy integration into industrial control systems. It features a robust 24 V DC coil with a wide operating range and an integrated diode for surge suppression, ensuring long coil life and compatibility with electronic controls.

Key Technical Specifications

• Product ID: 3RT2017-1VB42
• Contactor Type: Power Contactor / Coupling Contactor
• Brand: Siemens SIRIUS
• Size: Frame Size S00
• Poles: 3-pole
• Operating Current (AC-3e/AC-3): 12 A (at 400 V)
• Operating Power (AC-3e/AC-3): 5.5 kW (at 400 V)
• Control Voltage (Coil): 24 V DC
• Control Voltage Range: 0.85×Uc​ to 1.85×Uc​ (wide range)
• Surge Suppressor: Integrated Diode
• Auxiliary Contacts: 1 NC (Normally Closed)
• Connection: Screw Terminal
• Expandability: No auxiliary switch can be added

Application

The Siemens 3RT2017-1VB42 contactor is the ideal choice for general machine control and automation tasks, including:

• Switching 3-phase AC motors (up to 5.5 kW)
• Controlling resistive loads (up to 22 A at 400 V AC-1)
• Integration into complex control systems, including PLCs, due to its reliable DC coil operation and integrated surge protection.

Function

This device functions as an electromechanical switch. When the 24V DC control voltage is applied to the coil (A1/A2), an electromagnetic field is generated, which pulls the main contacts into the closed (make) position to supply power to the motor or load. When the coil is de-energized, springs return the contacts to the open (break) position, cutting off the power. The integrated 1 NC auxiliary contact changes state simultaneously, providing feedback or interlocking functions within the control circuit.

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