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"Fuseless" Surge Protective Devices

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Due to their robust and unique design, these SPD products can absorb and dissipate repeated current impulse surges of very high energy without failing. Their "fuseless" and "in-line" installation guarantees exceptional performance and continuous protection*: the fuseless surge protectors never leave your equipment unprotected.

Part Number	Item Description	E-Store Price	Buy Now!	Front View
SPD 120-1P-S3-2-00-A-H	Single phase fuseless SPD, 120V., Cat. B or C, 2 modes of protection (L-G, N-G), 140kA per mode, NEMA4 box: 8" x 6" x 6"	$911.00
SPD 120-2S-S3-3-00-A-H	Split phase fuseless SPD, 120/240V., Cat. B or C, 3 modes of protection (L1-G, L2-G, N-G), 140kA per mode, NEMA4 box: 8" x 6" x 6"	$1,112.00
SPD 120-2S-M3-3-06-A-H	Split phase fuseless SPD, 120/240V., Cat. B or C, 3 modes of protection (L1-G, L2-G, N-G), 140kA per mode, NEMA4 box: 12" x 10" x 8", LED's, remote relays	$1,368.00
SPD 120-3Y-M3-4-06-A-H	120/208Y Wye fuseless SPD, 3-phase, 4-wire, Cat. B or C, 4 modes of protection (L1-G, L2-G, L3-G, N-G), 140kA per mode, NEMA4 box: 12" x 10" x 8", LED's, remote relays	$1,665.00
SPD 277-3Y-M3-4-06-C-H	277/480Y Wye fuseless SPD, 3-phase, 4-wire, Cat. B or C, 4 modes of protection (L1-G, L2-G, L3-G, N-G), 140kA per mode, NEMA4 box: 12" x 10" x 8", LED's, remote relays	$1,830.00

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Service entrance Fuseless SPD's: Cat. C	Performance and Technical Data of the 200kA rated units Typical qualification report Independent test report Fuseless TVSS Specification Installation Instructions units Typical installation instructions for a Wye system Typical installation instruction for a Delta system Fuseless TVSS Brochure TVSS Selection Matrix
Branch Panel Fuseless SPD's: Cat. B or C	Performance and Technical Data of the 140kA rated units Typical qualification report Independent test report Fuseless TVSS Specification Installation Instructions Typical installation instructions for a Wye system Typical installation instruction for a 120/240V. system Fuseless TVSS Brochure TVSS Selection Matrix

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Questions and Answers

1. Why do industrial and commercial facilities need surge protection?
   
   In today's industrial world, modern electronics plays an important role. It boosts productivity and helps companies in achieving higher profitability.
   Unfortunately, modern electronic equipment, made of high speed, high-density semi-conductors, is extremely sensitive to current and voltage surges. If struck by lightning or hit by switching transients, it may become damaged and paralyze businesses for days.
   
   According to a survey conducted by the "Business Wire" magazine, US companies incurred in 1999 $26 billion in losses due to power surges. Most of the surges (over 60%) were generated within the facilities themselves (motors, air conditioning units, copiers, elevators).
   
   
   
2. What is SPD?
   
   SPD stands for "Surge Protective Device". It is a device that attenuates (reduces in magnitude) random, high energy, short duration electrical anomalies caused by utilities, lightning, or inductive loads.
   Such anomalies occur in the form of voltage and current spikes with duration of less than half an AC cycle. These high-energy power surges can damage sensitive electronic equipment, such as computers, instrumentation, and process controllers.
   
   SPD's are designed to divert the high-energy spike away from the equipment/load by providing a lower impedance path to common ground. Most SPD's are made of Metal Oxide Varistors (MOV's) connected in parallel with the load they protect. MOV's are packaged for specific voltage and current handling capacities. In normal current and voltage conditions, the MOV is not conducting (high impedance). Its impedance drops rapidly to very low values as soon as a surge hits it. The surge is then diverted to ground, protecting the normal load. Once the surge is over, the MOV returns to its non-conductive state.
   Other devices include single junction diodes or gas tubes that ionize at preset voltages.
   
   SPD's are typically installed in three areas: at the utility service entrance for asset protection of an entire site, in distribution panel boards and switchboards for protection of downstream loads, on the wall outlets for individual protection of specific pieces of equipment such as computers or controllers.
   
   
   
3. How to select a SPD?
   
   SPD's are selected based upon their surge current capacity and their clamping voltage. The surge current capacity defines the SPD ability to handle a transient event: for example, a high capacity SPD would be needed to divert to ground a lightning strike; but a lower capacity SPD would be sufficient to handle the smaller spikes generated by a copy machine.
   The clamping voltage is the voltage value at which the SPD starts to operate: the lower the value, the better the protection (assuming the SPD current capacity is appropriately selected for the transient events).
   
   
   
4. What about UL 1449, 3rd edition?
   
   The newest UL 1449 safety standard for Surge Protective Devices (SPDs) is now in effect. With the above SPD's, our customers are covered!

   Changes at a Glance:

   • Suppressed Voltage Rating vs. Voltage Protection Rating - The SPD letthrough voltage is now measured as it is subjected to an IEEE defined 6kV/3kA "combination waveform".
   • Nominal Discharge Current - The SPD Nominal Discharge Current capability, up to 20 kA, is now reported with the suppressor specifications and on its labeling.
   • Suppressor Categories - The new standard categorizes SPDs as one of four designated types based upon whether or not they are a component, and where within an electrical distribution they are to be installed.
   • TVSS is now SPD - The term identifying a surge suppressor as Transient Voltage Surge Suppressor (TVSS) was retired and will now be called a Surge Protective Device (SPD).
   • Extended Scope - 3rd Edition UL now governs suppression products designed to protect on electrical circuits up to 1000 V.
     
     
   • Are all SPD's alike?
     
     Despite the new standards, all surge protectors or SPD's do not perform alike.
     
     • First, the selection may not be optimum for the system and/or the transients that the system is exposed to. Proper selection should be the result of a thorough evaluation of the customer systems and environment. This requires a diagnostic expertise and monitoring equipment that all SPD suppliers do not offer. Too often, this lack of adequate assessment leads to bad SPD selection and insufficient asset protection.
       Keyitec offers a complete system diagnostic that ensures appropriate SPD selection.
       
     • Second, most of the existing products are designed with the adjunction of a fuse. The fuse is required to avoid a catastrophic end of life failure with fire and explosion. However, in case of a large current transient, the fuse might operate, putting off service the SPD and leaving the load unprotected at a time when it is the most needed.
       Keyitec provides a surge protector design without the need of a fuse, assuring uninterrupted protection of the customer equipment. These SPD units and the MOV modules have a safe end of life, with no risk of explosion or fire.
       
     • Third, most SPD's are connected to the customer system with long leads. Long leads increase the clamping voltage of the SPD's and may not protect effectively the customer equipment.
       These SPD units can be connected "in line" with the load, minimizing unnecessary connection leads and maximizing the level of asset protection.
       
     • Fourth, All the performance claims on the SPD units and MOV modules are backed up with real testing either conducted at independent laboratories (IIT Research Institute, R&B laboratory)
     
     

     Keyitec offers all the SPD units with the option of a surge counter. The counter allows the customer to monitor its system and the number of surges that triggered the MOV module operation. The counter only records surges that force the MOV module into operation (with a minimum current of 30A).

     
     

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   • Why is the fuseless SPD product line superior?

     1- Single MOV Vs parallel MOV's:

     Parallel MOV's are commonly used in SPD modules. The module rating or energy handling is calculated by multiplying the rating of one MOV by the number of MOV's; the assumption being that the surge will be shared equally by all of them . Testing of parallel MOV modules does not support this assumption: they fail at a much lower value.
     It is impossible for all the parallel MOV's to clamp at the same voltage: when submitted to a surge, the weakest MO clamps first and takes on most of the surge energy. Since it can only handle part of the surge, it degrades quickly and fails.
     
     

     	Keyitec SPD rating is not based on calculation but on testing of its single MOV module. This testing was performed by an independent laboratory in accordance with IEEE C62.41 and NEMA LS1 ( see independent test reports for the MOV modules).
     Single MOV Module

     2- No fuse:

     Fuse-protected devices can become disconnected after the first surge and let the second surge go right through, damaging all the sensitive equipment that they are supposed to protect.
     
     

     	Fuseless technology guarantees continuous asset protection surge after surge. The fuseless TVSS's never leave your equipment unprotected
     Fuseless TVSS's

     3- No leads that degrade performance:

     "T" installations using #6AWG wires or smaller result in a high let-through voltage and in a less than effective protection.
     
     

     	With its "in-line" installation, the fuseless TVSS offers the lowest let-through voltage and assures maximum protection for the connected equipment.
     Lowest clamping with "in-line" installation

     4- Claims supported by independent laboratory testing:

     Testing performed by independent laboratories guarantees the SPD performance. All our claims can be verified. Independent testing assures our customers that in choosing the fuseless SPD, they have selected the best.
     Independent test report 200kA rated TVSS's
     Independent test report 140kA rated TVSS's

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Request for Quotation - Fuseless SPD's

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