Siemens SIRIUS 3RT2017-2UW42 Power Contactor, 12A, 5.5kW, 48V DC Coil, Size S00, Spring-Loaded Terminals Original Brand New

Overview

The Siemens SIRIUS 3RT2017-2UW42 is a compact, high-performance power contactor from the SIRIUS 3RT2 series, designed for switching motors and general resistive loads in demanding industrial environments. Classified for both AC-3 and the new, efficiency-aligned AC-3e operation, this 3-pole contactor is rated for 12 A (up to $5.5\text{ kW}$ at $400\text{ V}$).

Its 48 V DC operating coil includes an integrated varistor for essential surge suppression, protecting the control system and extending the contactor’s service life. Featuring spring-loaded terminals, it ensures a vibration-proof, maintenance-free, and rapid-wiring connection, making installation simpler and faster, even in tight spaces, thanks to its compact Size S00 footprint.

Key Technical Specification

• Product: Power Contactor
• Manufacturer: Siemens
• Series: SIRIUS 3RT2
• Part Number: 3RT2017-2UW42
• Rated Operational Current (Ie​): $12\text{ A}$ (at $400\text{ V}$, AC-3/AC-3e)
• Motor Power Rating ($\text{P}$): $5.5\text{ kW}$ (at $400\text{ V}$)
• Number of Poles: 3-pole
• Control Supply Voltage (Us​): $48\text{ V DC}$
• Auxiliary Contacts: $1\text{ NC}$ (Normally Closed)
• Surge Protection: Integrated varistor
• Terminal Type: Spring-loaded terminal
• Contactor Size: S00

Function

The Siemens 3RT2017-2UW42 is an electromechanical switching device primarily used to safely and reliably switch 3-phase AC loads, particularly electric motors.

1. Motor Control: It acts as the main switching element for starting, stopping, and reversing motors (in combination with another contactor).
2. Load Switching: It can also be used to switch other high-current loads, such as heating elements, lighting systems, and capacitors.
3. Surge Suppression: The DC coil is protected against switch-off overvoltages by the internal varistor, ensuring a long electrical service life for the coil.
4. Feedback/Interlocking: The $1\text{ NC}$ auxiliary contact provides a signal when the main contacts are open, which is essential for safety circuits and interlocking with other components.

Application

This contactor is the perfect choice for machine builders and panel builders in applications such as:

• Small motor control (pumps, fans, conveyors)
• Industrial automation and machinery
• HVAC systems
• Control panel and switchgear construction
• Any application requiring reliable, compact switching of a $12\text{ A}$ load with a $48\text{ V DC}$ control voltage.

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