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4 December 2015In this article, we aimed to provide a brief overview of the types, categories, selection criteria, and application details of Panel Type LV Surge Protectors (Ag Parafudrs), which are widely used by panel manufacturers. With the increased inclusion of LV Surge Protectors in project specifications in our country, panel manufacturers have significantly increased their usage in production. However, undefined terms in specifications can cause confusion during product selection and lead to approval issues later. Apart from the approval process, if the correct product is not chosen for the correct point in terms of technical impact on the panel, serious problems may occur, and projects thought to be completed may need to be restarted. Therefore, to prevent both system protection and commercial issues, the LV surge protectors selected by panel manufacturers must be technically accurate.
Lightning Protection Center delivers the products of our French and German partners to many panel manufacturers in our country, and generally, the problems we encounter are due to unclear specification details, as mentioned above. In order to offer an economically optimal solution, our engineers provide technical support to our customers to select the most suitable product according to the specification and panel technical characteristics.
As is known, panel type surge protectors are primarily classified according to the system grounding type. For TT, TNC, TNC-S grounding and neutral bar conditions, we need to determine the connection details of the product. The location and panel type where it will be used are also important. Class B, B+C, or B+C+D products should be preferred at main entries and transformer outputs. However, it is not necessary to use products with a 100 kA breaking capacity. Compact, faster-acting products that operate within 25 nanoseconds have been developed with new technology. 100 kA breaking capacity Class B products generally operate within 100 nanoseconds. Depending on the region of use, using compact products that act very quickly and provide protection of 50 kA at 10/350 µs lightning curve and 100 kA at 8/20 µs curve is both more economical and technically correct.
Therefore, the region where the product will be used and the function of the panel are important. In sub-distribution panels, motor machine panels, and special purpose panels, we must use products that coordinate with those used in main panels and provide staged protection according to IEC 62305 standard. In sub-distribution panels, Class 2 or Class 2+3 products can be selected, but the distance intervals and panel grounding type are still important.
B+C class products should be connected in parallel with a 16 mm² cable in panels, while C class products should use a 6 mm² cable. The use of a fuse in front of the surge protector is mainly preferred for varistor-type products. It is not mandatory for VG technology products. The fuse value selection is determined based on tests according to product characteristics. You can also get information on this from our center.
LV SURGE PROTECTOR details and selection can always be consulted with Lightning Protection Center. We aim to optimally recommend over 2,500 different types of products for your systems.
