“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”

“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”

OBRIGADO DEUS PELA VIDA,PROTEGENOS E GUARDANOS DE TODO MAL


AUTOR DO BLOG ENG. ARMANDO CAVERO MIRANDA SAO PAULO BRASIL

domingo, 24 de janeiro de 2010

Varistors Satisfy the Extended UL 1449 Standard



In recent years, the European electrical and electronics industry has reworked the safety
standards for surge protective devices (SPDs) several times – in some cases with
significant changes: thus the first edition of EN 60950-1 specified the mandatory use of
surge suppressors. They additionally had to satisfy the then applicable UL 1449 standard
on transient voltage surge suppressors (TVSS).
The second edition of EN 60950-1 stipulates that a varistor used in a primary circuit
must satisfy either IEC 61051-2 or the new UL 1449 3rd Edition.
By Wolfgang Dreipelcher, Epcos

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