Siemens 3RT2944-5NP31 Contactor Coil 175-280V AC/DC Varistor Original Brand New

Overview

The Siemens 3RT2944-5NP31 is a high-quality spare or replacement magnetic coil designed specifically for the SIRIUS 3RT2.4 series power contactors. This essential component is engineered for reliable operation across a wide control supply voltage range of 175-280 V AC/DC at 50/60 Hz. A key feature for enhanced durability and system protection is the integrated varistor, which provides effective surge suppression, protecting both the coil and the wider control circuit from voltage spikes.

Benefit

• Wide Voltage Tolerance: Operates reliably on both AC and DC control supply voltages ranging from 175V to 280V, simplifying stock keeping and offering flexibility in control circuit design.
• Enhanced Circuit Protection: The integrated varistor provides crucial surge protection, suppressing switching overvoltages and extending the lifespan of the coil and associated electronic components.
• Reliable Performance: As a genuine Siemens SIRIUS component, it ensures optimal functionality, reliability, and seamless compatibility with the 3RT2.4 contactor.
• Reduced Downtime: An easy-to-install replacement part that minimizes maintenance time and quickly restores the full function of your contactor assembly.
• AC/DC Versatility: Its ability to operate on both AC and DC power makes it suitable for diverse industrial control applications.

Function

The magnetic coil is the core actuator of the contactor. When the specified control voltage (175-280 V AC/DC) is applied to the terminals, the coil generates a magnetic field. This field overcomes the spring force to pull the armature, closing the main and auxiliary contacts of the 3RT2.4 contactor and allowing power to flow to the connected load, such as a motor. When the voltage is removed, the magnetic field collapses, and the spring force opens the contacts, de-energizing the load. The integrated varistor clamps transient voltage spikes generated during coil de-energization, preventing damage to control circuit elements.

Technical Specification

• Product Number: 3RT2944-5NP31
• Product Type: Magnetic Coil / Solenoid Coil
• Compatibility: For Siemens SIRIUS Contactor 3RT2.4.-.N
• Control Supply Voltage (Us​): 175 V to 280 V AC/DC, 50/60 Hz
• Surge Protection: Integrated Varistor
• Manufacturer: Siemens
• Series: SIRIUS

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