BS IEC 61051-2 is the second part of an international multi-series standard that covers the harmonized system of quality assessment for electric components.
BS IEC 61051-2 is applicable to surge suppression varistors intended to protect electronically and other sensitive equipment from surges, operating from a d.c. supply, or an a.c. supply having a frequency not greater than 400 Hz.
BS IEC 61051-2 stipulates the technicalities such as related terms, documentation, information regarding the product specification, preferred ratings, preferred characteristics, test severities, quality assessment procedures, test schedules for quality approval, etc., for surge suppression varistors.
Note: Varistors that are the subject of BS IEC 61051-2 are not intended to give primary protection against lightning surges.
BS IEC 61051-2 on Sectional specification for surge suppression varistors is useful for:
Varistors are used as control or compensation elements in circuits either to provide optimal operating conditions or to protect against excessive transient voltages.
BS IEC 61051-2 includes elaborated information such as preferred ratings, preferred characteristics, test severities, along with the appropriate quality assessment procedures, tests methods, and measuring methods. It serves the object to give general performance requirements for surge suppression varistors to ensure their functioning.
BS IEC 61051-2 also informs about the severities for the cold and dry heat tests, depending on the lower and upper category temperatures respectively. Thus, it helps the users to verify the performance and working of the surge suppression varistors and ensure their high efficiency, supreme class, and reliability.IEC 61051-2:1991/AMD1:2009