Siemens 3RT2016-1QB42 SIRIUS Power Contactor, S00, 9A, 24V DC Original Brand New

Overview

The Siemens 3RT2016-1QB42 is a compact, high-performance SIRIUS 3RT20 power contactor designed for reliable switching of motors and other resistive loads up to $4\text{ kW}$ (at $400\text{ V}$). Part of the highly successful Siemens SIRIUS modular system, this $3\text{-pole}$ contactor in Size S00 is engineered for industrial control panels where space efficiency and consistent performance are critical.

It features a $24\text{ V DC}$ control voltage coil with a plugged-on varistor for essential surge damping, ensuring protection for the control system. The contactor offers a fixed auxiliary contact configuration of $1\text{ NC}$ (Normally Closed) and utilizes robust screw terminals for secure and straightforward wiring. The DC coil's extended operating range guarantees reliable switching even under fluctuating voltage conditions.

Key Benefit

• Space-Saving Design (Size S00): Extremely compact dimensions ideal for installation in constrained cabinets.
• Reliable DC Control: $24\text{ V DC}$ coil with a wide operating factor (0.7×Uc​ to 1.25×Uc​) ensures reliable operation in diverse industrial environments.
• Integrated Protection: Pre-installed varistor offers effective surge suppression, protecting the coil and extending the contactor's service life.
• High Performance: Rated for $9\text{ A}$ (AC-3e/AC-3) and $4\text{ kW}$ at $400\text{ V}$, suitable for standard motor switching applications.
• Simple Wiring: Features tried-and-tested screw terminals for robust and easily verifiable connections.
• Global Compliance: The SIRIUS series adheres to international standards (e.g., IEC, UL/CSA), making it suitable for global applications and machinery export.

Technical Function

This $3\text{-pole}$ power contactor functions as an electrically operated switch for a primary electrical circuit. When $24\text{ V DC}$ is applied to the coil terminals, an electromagnetic force pulls the main contacts closed, allowing power to flow to the load (e.g., an electric motor). When power is removed, springs open the contacts, safely interrupting the circuit.

The classification AC-3e/AC-3 indicates its suitability for switching $3\text{-phase}$ squirrel-cage motors:

• AC-3: Switching on a motor and switching it off during running.
• AC-3e: The enhanced efficiency class for standard motor switching.

The integral $1\text{ NC}$ auxiliary contact changes state simultaneously with the main contacts, providing a closed signal when the main contacts are open, which is essential for feedback and interlocking in control circuits. Note that due to its specific design, no further auxiliary switch blocks can be added to this model.

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