Siemens 3RT2926-1BE00 Varistor Surge Suppressor 240-400V AC, SIRIUS S0 Original Brand New

Overview

The Siemens SIRIUS 3RT2926-1BE00 is a compact, high-performance Varistor Surge Suppressor designed to protect the coil of Siemens 3RT2.2 series power contactors (Size S0) from damaging switching overvoltages. Operating on a wide control supply voltage range of 240-400 V AC at 50/60 Hz, this critical accessory ensures the long-term reliability and operational stability of your motor control applications. Its clip-on design allows for simple, tool-free installation directly into the contactor, maintaining the contactor’s compact footprint.

Key Benefits & Features

• Extended Contactor Lifespan: Utilizes varistor technology to effectively absorb voltage spikes caused by switching inductive loads, protecting the delicate contactor coil insulation from premature failure.
• Simple & Fast Installation: Features a convenient clip-on mechanism that easily inserts into the designated slot on the 3RT2.2 contactor, requiring no additional wiring or modification to external dimensions.
• Wide Voltage Compatibility: Supports a broad control supply voltage range from 240 V up to 400 V AC, making it versatile for various industrial control panel designs.
• SIRIUS Modular System: Seamlessly integrates with the Siemens SIRIUS modular control system, ensuring compatibility and high quality.
• Maintain Compact Design: Because it mounts internally/slots in, it ensures the overall width and external dimensions of the motor starter assembly remain unchanged.

Function

The 3RT2926-1BE00 Varistor functions as a protective device against coil de-energization overvoltages. When the control voltage to the contactor coil is switched off, the coil’s magnetic field collapses, inducing a high-voltage surge (back-EMF). The varistor limits this voltage spike to a safe level, preventing damage to the contactor’s coil and surrounding electronic components in the control circuit. This is crucial for maintaining the long-term reliability of industrial control gear.

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