Surge Protector- Over Voltage Protector

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You guys seen these things sold yet?Surge Protector- Over Voltage Protector for welding on cars....http://www.sjdiscounttools.com/dfxdf601.html
Reply:Never seen one before.  Looks like hocus pocus to me.  If it just connects from the positive to negative terminals of the battery, I don't see where it would be protecting anything in the car's downstream electronics.  Disconnecting the battery would likely accomplish more than the device in question.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:I’ve used surge protectors at work to protect computer equipment from lightening strikes, surges from the power grid switching and bring backup generators online. These units are configured and rated to handle utility power, 120, 240, 480 volts single and three phase Y and Delta circuits at 100,000 to 6,000,000 Amp-seconds. And yes they do work. You can have your local utility install a consumer model for home use to protect your PC, DTV, etc. Well worth the expense to protect that $$$ PC and DTV.The unit you are asking about uses the same technology, however “Heavy Duty” means very little. What counts are the Amp-seconds power it will absorb and the let-through voltage that it will reduce the spike to? If the let-through voltage is high then the computer gets zapped. It looks like the unit is clamped across the battery terminals, meaning that it must not turn-on at normal voltages [12-15V] and turn-on at something more than 15+ volts, not knowing what the maximum safe voltage a OBS computer will tolerate, cant say how much protection you get. I’d go with removing the battery cables until I know more.
Reply:Yeh, if it's ordinary old school varistor the clamping times are probably too slow to do any good for the most delicate type of electronics. This thing would have to have approvals from about ten different agencies before I'd go clipping some unknown and unproven device directly across any battery of mine. The auto makers themselves give procedures for jump starting and charging and they never mention adjunct devices.
Reply:Originally Posted by gocirinoYou guys seen these things sold yet?Surge Protector- Over Voltage Protector for welding on cars....
Reply:If you care to read more deeply.http://en.wikipedia.org/wiki/Varistorhttp://www.mcgsurge.com/products/dc/dc_series.htm
Reply:Originally Posted by transitIf you care to read more deeply.http://en.wikipedia.org/wiki/Varistor
Reply:Second, protectors (including MOVs) are more than fast enough. Unfortunately, many people only know about protectors from hearsay and myths. Let themselves become a victim.
Reply:Originally Posted by westomPlease quote the part you think is in disupte.  1) What was posted in quite in agreement with the Wikipedia citation.  2) Citing a sales brochure without quoting the relveant parts suggests your knowledge comes only from hearsay and sales myths. 3) What in your post is relevant to or helps the OP?
Reply:Originally Posted by Sandy That's quite the statement. So they are all equal regardless of cost or makeup? There's no difference in a DC current spike and an AC high frequency voltage spike and any ole "fast enough" 90¢ MOV will get the job done?