MEM recognises that commercial and industrial surge suppressor applications cover a wide range. To accommodate these requirements, we offer a broad array of AC power, data and telecommunications models of the I.T. Protector® from MEM.

Many factors influence the selection of the right Protector® model. These factors are directly related to the size and complexity of a facility, as well as specific variables such as location category, exposure level and mission critical or general purpose load requirements. Electrical system layout, location of the premises and proximity to other facilities are also important factors to consider.

MEM is able to perform a system survey and load risk analysis. This survey will provide the necessary information for individual model selection as well as determining facility-wide System Shield® protection.

Category C
Large service entrances, distribution panels, roof top locations and outdoor locations.

Category B
Service entrances, distribution panels, short run sub-circuits (from service entrance).

Category A
Final circuit distribution boards, long run sub circuits (from service entrance), point of use isolators/fuse switches.

High Exposure
High lightning areas, close proximity to large industrial facilities, very active internal load switching environment, large inductive loads and other heavy transient sources sharing common circuits with mission critical and sensitive loads.

Medium Exposure
Moderate lightning areas, active internal load switching transient environment, sensitive loads and transient generating source sharing common circuits, moderate use of sensitive loads.

Low Exposure
Low lightning areas, moderate to low internal load switching transient environment, limited use of sensitive loads.

Mission Critical Loads
Microprocessor based equipment, PCís, servers, workstations and control circuits for variable drives, PLCís, robotics, automated manufacturing systems, process control cabinets, telephones/faxes/modems, fire alarm/security systems, etc.

PTE indicates addition of optional normal mode and common mode multistage hybrid Active Tracking Network (ATN®) Filter.

Notes:

1) This is a general guide only. For further information, please contact MEM Technical Services on 0121 685 2001.

2) We recommend a suppressor with Active Tracking Network for the protection of sensitive loads. (For example: Computer suites, data/telecom equipment, PLC controlled equipment including variable drives, building management systems, CNC production machinery etc.) N.B. The enhanced N-E mode Active Tracking Network featured on all PTE models MUST be disabled by cutting the selection link if the suppressor is directly connected to patient-connected medical equipment or instrumentation, circuits fed via RCD/ELCB devices, circuits connected to loads having significant % Total Harmonic Distortion (eg variable drives), or circuits with FM communications superimposed upon the 50Hz base power frequency.

3) All devices listed here require a 32A protective device of appropriate short circuit rating for the installed location prospective short circuit current. This may be via MCB, MCCB or BS88 fuses.

4) The length of lead connecting the suppressor to the board to be protected is critical. Ensure ALL leads are as SHORT and STRAIGHT
as possible. Where possible bind leads tightly along their length.