Transient Voltage Surge Suppressor (TVSS) A device designed to protect electrical equipment from high-energy transients or voltage surges caused by lightning, power grid disturbances, or other sources. Typically connected upstream of the surge suppression device. Acts as a sacrificial device, diverting and absorbing the surge energy to prevent it from reaching sensitive equipment.

Surge Suppression Device A device designed to suppress or attenuate smaller voltage transients and surges that may not be handled by a TVSS. Connected downstream of the TVSS, providing additional protection for specific equipment or circuits. Can include devices such as metal oxide varistors (MOVs), capacitors, or gas discharge tubes.

Key Differences



Protection Level

TVSSes offer higher protection against extreme surges (e.g., lightning), while surge suppression devices are designed for lower-level surges.

Location

TVSSes are typically installed at the service entrance or main electrical panel, while surge suppression devices can be installed at individual equipment or outlets.

Sacrificial vs. Non-Sacrificial

TVSSes are often sacrificial devices that must be replaced after absorbing a surge, while surge suppression devices are generally non-sacrificial and can continue functioning after multiple surges.

Cost: TVSSes are typically more expensive than surge suppression devices. Flag for review