Siemens SIRIUS 3RT2936-1BC00 Varistor Surge Suppressor for 3RT2 Contactors, 48-127V AC / 70-150V DC Original Brand New

Overview

The Siemens 3RT2936-1BC00 is an essential accessory for the SIRIUS modular system, specifically designed as a varistor surge suppressor for the Siemens SIRIUS 3RT2 power contactors, sizes S2 and S3 (models 3RT2.3 and 3RT2.4). This compact, clip-on module provides critical protection against transient voltage peaks (surges) that can occur in the control circuit, significantly extending the service life of the contactor and improving system reliability.

Key Benefit

• Maximized Contactor Lifespan: Protects the delicate internal components and coil of the 3RT2 contactor from damaging switching surges.
• Enhanced System Reliability: Prevents unexpected shutdowns and component failure caused by voltage spikes, ensuring continuous operation.
• Space-Saving Design: The compact, clip-on design allows for easy, hassle-free insertion directly into the contactor’s existing slot without increasing the overall external dimensions of the assembly.
• Easy Installation: Features a simple clip-on fastening method, making installation quick and tool-free.

Function

The 3RT2936-1BC00 operates as a voltage-dependent resistor (varistor). It is connected in parallel to the contactor coil. When a voltage surge occurs, the varistor’s resistance instantly drops, effectively shunting the excessive voltage and current away from the coil. This action quickly dissipates the energy of the surge, limiting the peak voltage to a safe level and protecting the contactor’s insulation and coil winding. It is a vital component for ensuring the longevity and stable performance of control circuits utilizing the SIRIUS 3RT2 contactor range.

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