This edition supersedes the first edition of IEC 255-8 (1978) and IEC 255-17 (1982). Applies to dependent specified time electrical measuring relays which protect equipment from electrical thermal damage by the measurement of current flowing in protected equipment.

This standard has been prepared by Sub-Committee 41B: Measuring relays and protection equipment, of IEC Technical Committee 41: Electrical relays. This standard constitutes the second edition of I E C Publication 255-8 and replaces the first edition (1978).

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according to IEC 947-4-1 the maximum tripping time in seconds under specified conditions of test at 7.2 times the setting current and specifies tripping and non tripping times for …

(conforming to IEC 255-8) Normal operation ˚C - 20…+ 55 (1) Maximum operating altitude Without derating m 2000 Operating positions In relation to normal, vertical Any position without derating mounting plane Shock resistance Permissible acceleration 13 gn - 11 ms conforming to IEC 68-2-27

iec 255-4 datasheet, cross reference, circuit and application notes in pdf format. The Datasheet Archive. Search. Browse by Manufacturer Get instant insight into any electronic component. Try Findchips PRO for iec 255-4. Top Results (6) Part ... Text: : IEC 255-8, ...

IEC 255-3 datasheet, cross reference, circuit and application notes in pdf format.

din iec 255-8 vde 0435-3011 * German Language Version * Electromagnetic compatibility (EMC); Product standard for measuring relays and protection equipment; German version prEN 50163:1996

IEC-255-8 Part 8: Thermal Electrical Relays, Electrical Relays

The IEC curves that follow are defined by the following equation and table of coefficients. Trip Time = ()TimeDial M K P ...