Raycap:
SPD Modules Provide Over-Voltage Transient Suppression
Friday, February 01, 2008

Raycap Inc., a leader in transient voltage surge suppression technology, has developed a surge protection device (SPDs) that provides continuous protection from over-voltage and other transient voltage activity for industrial equipment such as variable speed drives (VSDs), programmable logic controls (PLCs) and power cabinets. Designated Strikesorb, the SPD modules are designed to protect equipment from lightning strikes, power surges and spikes without performance deterioration.Strikesorb modules are available in a wide range of voltage and packaging configurations to protect sensitive equipment and electronics.
Strikesorb modules meet the demanding requirements of IEC 61643-1 and UL 1449 2nd Edition - dated February 7, 2007 - without the use of internal fuses. Fuses used in other surge protection devices can compromise the protection capabilities of the SPD system. Strikesorb's unique fuseless design and its capability to withstand high short-circuit currents allow direct installation on busbars, precluding the need to install additional fuses or interconnection wires. Because Strikesorb modules provide uninterrupted protection against repeated surges in harsh environments, it can extend the operating life of the industrial equipment, as it is never left unprotected from transient activity.
"Our Strikesorb modules have successfully passed 3-cycle testing at available short circuit currents of up to 100kA. The SPD can easily be integrated in equipment without the need to conduct additional UL testing," said Jeff Gibbons, VP Sales and Marketing at Raycap Inc. "Because equipment that incorporates Strikesorb modules do not require further UL 1449 testing in order to meet UL Listing requirements, equipment manufacturers can save money while getting their products to market faster."
Unlike other SPD systems that employ parallel arrays of smaller conventional metal oxide varistors (MOVs) or silicon avalanche diodes (SADs), Strikesorb modules are comprised of a single, large distribution-grade MOV disc in an environmentally sealed aluminum housing that provides uniform distribution of the surge current over the total area of the MOV protection element. This results in a high-energy handling capability combined with ultra-low let-through voltage to the industrial equipment. The monolithic design also provides a straight electrical path directly to the suppression element, providing extremely low contact resistance and a superior heat dissipation mechanism to prevent aging and premature failures of the SPD.
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