Stopping surges before they get into your facility is best accomplished by applying hard wired surge protective devices (SPDs) at your incoming service. Additional downstream hard wired SPDs are recommended to clean up residual surge energy to protect secondary system voltages. Hard wiring anything to an electrical system is not easy. Once hard wired, SPDs are exposed to varying types of electrical disturbances outside the scope of surges.

Disturbances like line to line or line to ground faults, loss of secondary neutral, misapplications, poor voltage regulation are a few example disturbances that mimic surge like characteristics. SPDs then try to control these events that when compared to surges deposit more energy within a SPD for a longer period of time than their designed operational tolerance. This could result in a pre-mature end life operation. To ensure safe operation, SPDs need internal fully coordinated fault current protection. This is where Siemens TPS stands out from the rest.

In 1998, Underwriters Laboratories updated UL 1449 by requiring SPDs to pass fault current testing, Siemens responded by integrating patented TranSafe fault current protection circuitry within every TPS. TranSafe based SPDs operate safely when exposed to the FULL spectrum of fault currents (0 to 200kA). With subsequent UL 1449 revisions additional fault current testing was adopted eliminating testing criterion blind spots, others responded by redesigning their device’s with new or updated safety controls, but Siemens TPS stayed the same. TPS was designed right from the get go.

Our TPS with TranSafe protection not only ensure safe operation, but superior surge protection performance is maintained. Siemens TPS SPDs protect your electronics with some of the industries best UL 1449 listed suppressed voltage ratings. Also, our family of SPDs offers the widest redundant surge current capabilities from 80kA to 800kA.