Siemens 3RT2926-1BF00 Varistor Surge Suppressor, 400-600V AC For SIRIUS 3RT2.2 Contactors Size S0 Original Brand New

Overview

The Siemens 3RT2926-1BF00 is an essential overvoltage limiter designed to integrate seamlessly into the SIRIUS modular system, specifically for the 3RT2.2 series of motor contactors (Size S0). As a high-quality varistor surge suppressor, it effectively dampens induced voltage peaks caused by switching the contactor coil, preventing premature wear and potential damage to sensitive control components and the contactor itself. Its simple, clip-on design allows for quick and easy installation without altering the contactor’s external dimensions.

Benefit

• Extended Contactor Lifespan: Protects the coil insulation and auxiliary contacts from destructive voltage spikes, leading to reduced maintenance and replacement costs.
• Enhanced System Reliability: Ensures stable operation of the control circuit by suppressing electromagnetic interference (EMI).
• Simple Installation: Features a convenient clip-on/plug-in mounting that fits directly into the pre-existing slot on the contactor, eliminating the need for external wiring or tools.
• Compact Integration: Maintains the original size and footprint of the contactor, conserving space in the control cabinet.
• Industrial Quality: A genuine Siemens SIRIUS component, guaranteeing performance and compatibility within industrial control applications.

Function

The varistor (Voltage-Dependent Resistor) element in the 3RT2926-1BF00 provides a low-impedance path for transient overvoltages. When the contactor coil is de-energized, the collapsing magnetic field generates a high-voltage spike. The varistor immediately clamps this transient energy, limiting the spike to a safe level and protecting the coil, adjacent circuitry, and control signals from damage or interference. This makes it crucial for compliance with various electromagnetic compatibility (EMC) requirements.