IEC 60740-1:2005 ED1

Laminations for transformers and inductors - Part 1: Mechanical and electrical characteristics

Publication date:   Aug 9, 2005

General information

60.60 Standard published   Aug 9, 2005


TC 51 Magnetic components, ferrite and magnetic powder materials

International Standard

29.100.10   Magnetic components



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IEC 60740-1:2005 specifies the characteristics of laminations. Their preferred use is cores for transformers and inductors. The laminations are made of sheets and strips of magnetic materials, specified in IEC 60404-8-4 and IEC 60404-8-7. The main changes are listed below:
a) ranges with lamination strips YS, YSUI 1, YSUI 2 and laminations YEE 2-..L added;
b) range YEI 1 extended at the above end;
c) ranges YED 2, YEF 2, YEL 2, YES 2, Type YM 1-5a and YM 1-7a cancelled;
d) national designations cancelled;
e) electrical characteristics for the laminations specified;
f) mechanical characteristics for laminations added;
g) holes added for lamination types YEI 1, YUI 1, YUI 2, YM 1;
h) in Annex A, a conversion of the polarisation J and the field strength H in a specific total apparent power is defined. For the characteristics of the reactive power and the power loss, equations and constants are specified.

Life cycle


IEC 60740:1982 ED1

IEC 60740:1982/AMD1:1991 ED1


IEC 60740-1:2005 ED1
60.60 Standard published
Aug 9, 2005