Siemens SIRIUS 3RT2926-1BD00 Varistor Surge Suppressor 127-240V AC / 150-250V DC for 3RT2 Size S0 Contactors Original Brand New

Overview

The Siemens SIRIUS 3RT2926-1BD00 Surge Suppressor is a vital component for enhancing the reliability and lifespan of your industrial control systems. Specifically designed as a varistor-type overvoltage protection module, it is engineered for seamless integration with Siemens 3RT2 series contactors (Size S0). This plug-in unit effectively dampens voltage peaks that occur when a contactor coil is switched off, protecting the coil and other sensitive control circuit components from damaging electrical transients.

Benefit

• Extended Contactor Lifespan: Protects the contactor coil and surrounding control electronics from high-energy inductive voltage peaks, significantly extending the service life of your equipment.
• System Reliability: Prevents spurious faults and failures in control circuits caused by electromagnetic interference (EMI) generated during switching operations.
• Universal Voltage Range: Features a wide operating range of 127-240V AC and 150-250V DC, offering flexibility and easy application across various control voltages.
• Simple, Tool-Free Installation: The convenient clip-on design allows for fast, front-side installation directly onto the contactor coil terminals without altering the contactor’s external dimensions.
• Genuine SIRIUS Quality: Manufactured by Siemens, ensuring compliance with global standards and perfect compatibility with the SIRIUS modular control system.

Function and Application

The Siemens 3RT2926-1BD00 uses a varistor (Voltage-Dependent Resistor) as its core component. When the contactor coil is de-energized, the collapsing magnetic field induces a high-voltage spike (back EMF). The varistor’s resistance drops sharply when this transient voltage exceeds its threshold, effectively short-circuiting and clamping the voltage spike to a safe level.

This varistor suppressor is essential for applications where reliable operation is critical, especially when:

1. The control circuit contains sensitive electronic components (e.g., PLCs, VFDs).
2. The contactor is switched frequently.
3. The control voltage is within the specified 127-240V AC or 150-250V DC range.

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