TVSS-Transient Voltage Surge Suppressor 2019-02-13T16:21:15+00:00

TVSS (Transient Voltage Surge Suppressor)

TVSS (Transient Voltage Surge Suppressor) and SPD (Surge Protective Device), both refer to the device that can protect the low-voltage electrical system from damages of transients, spikes or surges (indirect lightning strike induced from power lines).

Why do SPD manufacturers no longer describe their products as TVSS?

TVSS devices have always belonged to a larger family of surge suppression devices known as SPDs (Surge Protective Devices). Beginning with UL 1449 3rd Edition and the 2008 National Electrical Code, the term “SPD” has formally replaced the terms “TVSS” (Transient Voltage Surge Suppressor) and “Secondary Surge Arrester”. SPDs are now classified as Type 1, Type 2, Type 3 or Type 4 and are selected based on application and the location where they are to be used. With the recent changes in terminology by UL and the NEC, there are no longer any standards organizations that use the term TVSS, as IEEE®, IEC® and NEMAhave been using the term “SPD” for many years.

How does TVSS (transient voltage surge suppressor) work?

The terms surge protection device (SPD) and transient voltage surge suppressor (TVSS) are used to describe electrical devices typically installed in power distribution panels, process control systems, communications systems, and other heavy-duty industrial systems, for the purpose of protecting against electrical surges and spikes, including those caused by lightning. Scaled-down versions of these devices are sometimes installed in residential service entrance electrical panels, to protect equipment in a household from similar hazards.

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