Does anyone have a complete schematic of the BrickWall Series Mode Surge Protector?
Here is a not complete review how does it work

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When designing and installing power distribution systems, engineers and contractors select surge protective devices (SPDs) to protect electrical equipment and systems from transient overvoltages. To do so, specifiers must understand the differences between parallel-connected and series-connected SPDs, and where to best apply each type of device. The following narrative summarizes the design and function of parallel-connected and series-connected SPDs and describes some common applications for each.

In general, a parallel-connected device is installed on an electrical switchboard or panelboard, typically to a dedicated service disconnect, such as a circuit breaker. Alternatively, standalone series-connected filters are connected in-line near protected load equipment.

Parallel-connected SPDs are capable of clamping high-energy low-frequency transients. Their benefits include lower cost and smaller size than series-connected devices, and installation procedures that do not require interruption of power to loads. Their disadvantages include performance differences according to the length of installed leads, instantaneous let-through voltages that vary by phase angle, and lack of attenuation of high-frequency noise.

Series-Connected SPDs

Series-connected devices fall into the two broad categories of series-connected SPDs and series-connected filters. Typically, series-connected SPD designs are wired in series, but internal suppression components are connected in parallel to the circuit. The benefit of this configuration is that lead length is not added during installation, allowing the device to clamp impulses at tighter levels than a parallel-connect unit. The ampere ratings of series-connected units are limited by their lug or terminal block characteristics.

Series-connected filters are designed to protect sensitive equipment, such as computers and digitally controlled equipment, from high-frequency noise that could disrupt reliable operation. Manufacturers offer these products to provide protection from high-frequency, low-energy transient overvoltages as well as noise filtering. These devices mitigate voltage whenever transient voltages exceed the instantaneous nominal voltage by a specified amount, regardless of phase angle.

Series-connected filters use a low-pass circuit (consisting of series-connected inductors, capacitors, and resistors) to eliminate high-frequency noise. Because the entire load current passes through the components, the device must be designed to pass all of the current carried by the circuit it serves. As a result, series-connected filters are typically larger and more costly than parallel-connected devices.

Benefits of series-connected devices include mitigation of potentially damaging high-frequency noise, a tighter clamping voltage, and performance that is independent of installation practices.

Studies show that 20-30 percent of transient overvoltages originate externally, from environmental and utility sources, and are more likely to consist of high-energy, low-frequency impulses. That means 70-80 percent originate from equipment and operations inside of a facility and are more likely to consist of low-energy, high-frequency noise, such as ringwaves.

If destructive high-energy transients pose the greatest risks, then a parallel-connected device is likely to be the most cost-effective solution.

If sensitive equipment could be disrupted by high-frequency noise, then a series-connected filter may be the best choice.

Where multiple types of transients may occur or where the characteristics of any power disturbance are unknown, then a staged strategy involving both parallel-connected and series-connected devices should be used. Effective protection is often provided when parallel-connected SPDs are installed at service entrances and distribution panels, and series-connected devices are installed near load equipment.

It is often suggested that “surge suppressors” (devices which limit the magnitude of surge energy) might address these problems. Power “Outlet Bars” with internal “Shunt Mode” circuitry are obtained and installed in various equipment locations throughout the building.

While perhaps surprising, it is not unusual to find that the net results from these efforts often range from no difference at all through•vague “improvements” to outright worsening of the original problem(s). In some cases the “improvements” first realized will unpredictably disappear after some time for no apparent reason.

Shunt Mode Surge Suppressors
Shunt Mode surge suppressors operate by redirecting (shunting) incoming surge energy onto their associated EG conductors, with the result that the local ground reference potential rises due to the current flow through the impedance of the circuit path back to Building Ground.

For a ground path length of more than a few feet, this impedance can be substantial, resulting in significant voltages with respect to other “grounded” areas in the building.

Any and all equipment connected to a Shunt Mode surge protection device will thus experience an abrupt elevation of its local EG reference potential during surge events.

For non-networked standalone applications this may be an academic issue. The additional drawbacks described below are considerably more serious, however.

Metal Oxide Varistors (MOV’s), the principal component(s) which divert incoming surge energy into EG conductors in virtually all Shunt Mode surge suppressors, exhibit a “fixed clamping voltage” characteristic, above which they rapidly change from virtual open circuits into low resistance conductors.

For a transient surge duration of not more than a few milliseconds, the resulting power dissipation in MOV’s can be tolerated. In the event of a continuous overvoltage condition of any significant duration however, MOV’s rapidly heat up and then either permanently revert to their non-conductive state, or fail catastrophically with the attendant possibility of fire.

Irrespective of cost or manufacturer, the cumulative (sacrificial) effect of repeated surges over time will ultimately cause MOV’s to fail one way or the other. Recent MOV-based surge suppressor devices made to Underwriters Laboratories (UL) 1449–2 (2nd ed.) specifications incorporate a fuse element which disconnects the power in the event of catastrophic MOV failure.

Older MOV-based devices do not have this feature

Shunt Mode Surge Suppressors In Equipment Networks
It is not uncommon to encounter “Shunt Mode surge protected” equipment interconnected by network cables to other equipment elsewhere in a building which, for whatever reason are NOT connected to Shunt Mode surge suppressors.

During a surge event, “unprotected” equipment will experience little if any elevation of its ground reference potential, whilst “protected” equipment will experience an abrupt and often substantial rise in its ground reference potential.

The resulting surge currents flowing in network cable ground loops are thus considerably increased by the use of Shunt Mode surge suppressors at only one or some equipment locations•rather than all locations involved in the network.

The Series Mode Alternative
Series Mode surge suppressors act first as low pass filters which simply block the high-frequency (HF) components of powerline surges.

The remaining low-frequency (LF) surge energy is diverted into a bank of capacitors where it is stored for the duration of the event and then slowly discharged back across the incoming hot and neutral conductors without involving any connection to Equipment Ground.

Series Mode surge suppressors can thus be placed anywhere along a power circuit without the ground reference elevation disadvantage of Shunt Mode surge protection devices.

Series Mode surge suppressors incorporate “floating clamping voltage” circuitry which will withstand considerable overvoltage conditions of indefinite duration without damage or degradation of performance, and are UL certified to a Surge Endurance specification of A-1-1, the highest possible rating available2.

During a surge event, Shunt Mode surge suppressors located at the equipment load end of a branch circuit will cause an increase of local ground reference potential regardless of manufacturer and/or price.

Series Mode surge suppressors do not require periodic maintenance or testing, and do not cause an elevation of the local Equipment Ground reference potential during surge events regardless of where they are installed in an electrical power system.