Arc Terminator(TM) From Square D Quickly Extinguishes Arcs to Minimize Damage to Switchgear

Oct 24, 2001, 01:00 ET from Schneider Electric

    PALATINE, Ill., Oct. 24 /PRNewswire/ -- Medium-voltage metal-clad
 switchgear used in mission-critical power applications can be protected from
 damaging open arcing faults with the new Arc Terminator(TM) device from Square
 D.  The device controls and directs arc current, extinguishing arcs within 4
 ms -- less than 1/4 of a cycle -- to minimize equipment damage and reduce
     The Arc Terminator reduces the effects of an arcing fault at the point of
 initiation.  A fast-acting closing switch extinguishes the open burning arc
 and prevents the buildup of high internal pressures.  Therefore the energy
 that can be released is significantly reduced, protecting equipment.
     If the Arc Terminator detects an arc, an electronic control unit initiates
 the closing of a high-speed vacuum switch.  The electronic control requires
 two sensing inputs: (1) Optical sensors to detect arcing faults and (2)
 current sensors to detect any changes in the current waveform.  These two
 inputs must occur simultaneously to cause the unit to operate.
     An indicator on the junction box (which serves as a collector for the
 optical inputs), points to the compartment where the arcing fault occurred,
 making it easy for maintenance personnel to pinpoint the location of a fault
 and repair the problem quickly.  Once the cause of the fault has been fixed,
 the system is ready to be reset and returned to normal operation.  For
 critical applications such as petrochemical and large Internet data centers,
 this means less downtime.
     The device is shipped completely wired at the factory and designed for
 easy operation in the field.  Multiple switchgear sections can be connected on
 each side of an Arc Terminator section.  No settings or other calculations are
 required during switchgear installation.  The normal switchgear protective
 relaying functions are not changed by the addition of the Arc Terminator.
     For more information about the Arc Terminator or the complete line of
 circuit protection products from Square D, contact Square D at 1-800-392-8781.
 Or, visit the Square D web site at
     SQUARE D is a market-leading brand of electrical distribution, industrial
 control and automation products, systems and services, and is the flagship
 brand in the U.S. for the North American Division of Schneider Electric.
 SQUARE D products are found in all types of residential, commercial and
 industrial construction, in a wide range of manufacturing and processing
 facilities, and in or on the products of other manufacturers. Schneider
 Electric, headquartered in Paris, France, is a global electrical industry
 leader with 2000 sales of approximately $9.7 billion.
     This release is submitted for consideration in both print and Web
     Contact:  Bradford Muller
               Phone: (704) 916-6164
               Fax:   (704) 916-6076
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SOURCE Schneider Electric