Brick Wall Series Mode AC Surge Suppressors/Powerline Filters 

NO FAILURESBrickwall Surge Protection uses NO MOVs


We believe that a surge protection device should not fail. At the heart of our Series Mode Surge Filter is a massive inductor (photo below). This is not a sacrificial component. It will never fail. It will not degrade with use. In fact no component used in the construction of this product is sacrificial. A Brick Wall Surge Filter will never experience a surge related failure.

You do not have to take our word for it. Consider the following:

IEEE (The Institute of Electrical and Electronic Engineers) states that 6000V is the largest transient that the interior of a building would experience.

IEEE defines its harshest interior surge environment as one that could experience 100 surges of 6000V, 3000A in a years time (category B3).

A new federal guideline recommends that a surge protector utilized in a harsh environment should be capable of withstanding 1000 surges of 6000V, 3000A or ten years worth of IEEEís category B3.

UL (Underwriters Laboratories) now provides a new adjunct testing service (in addition to the 1449 safety classification) that will test to the 1000 surge, 6000V, 3000A federal protocol.

Passing such a test is a virtual guarantee that a surge protection device will never experience a surge related failure.

Early in 1996 UL applied 1000 surges (at 60 second intervals) of 6000V, 3000A to an off-the-shelf Series Mode Surge Filter.

There was no failure. There was no performance degradation. Let through voltage did not exceed 290V. Certified by UL.

You cannot do any better than this for a building interior surge suppressor.

Reliability is usually the number one parameter for selecting a surge protection device. Unfortunately most of what is available is not very reliable. Surge suppressors are notorious for failing.

Exploded MOV Not used in Brickwall Surge Protection


MOVís are the mainstay component of the surge suppression industry. For certain electronic applications they are an excellent choice. AC power line surge suppression is not one of them. MOVís function by creating a short circuit (usually to the neutral and the ground) when a preset voltage threshold is exceeded. Essentially they divert surge current away from what is being protected. Unfortunately MOVís are sacrificial components. This means that the performance life of any surge protection device utilizing this technology is finite. With every surge current diversion above a modest level an MOV comes closer to its inevitable end.


The joule rating of any MOV is a measure of the amount of energy it can absorb at one time without failing. With an MOV this level declines with use. When exceeded it can cause an explosion or a fire. In a harsh, lightning prone environment this limit can easily be reached. Our massive inductor limits current (hence voltage) and has no real world surge current/joule rating limitations. The product can withstand the harshest surge environment indefinitely.


Clamping threshold is the voltage level where the MOV activates. Typically it is set around 220V at 1 milliamp current. With the peak of the sine wave normally at 172V, a surge of only an additional 50V will activate that MOV. Just as repeated usage causes the joule limit of an MOV to drop it can also cause the clamping level to do the same. Eventually the clamping point can fall below the peak of the normal sine wave. In essence the MOV turns on with every cycle of the powerwave and experiences thermal runaway (fire). This characteristic of an MOV made them totally unacceptable to our engineers. Our surge protection products do not utilize MOVís and have none of their inherent limitations. Brickwall Surge Filters will not catch on fire.


The mechanisms are now in place for a manufacturer of a surge protection device to certify a product to very exacting specifications. Ask to see the UL test results that certify a product to 1000 surges of 6000V, 3000A

Click here for more information or to order

Return back to home page