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IEC 255-8 Internationa Standard Electrical relays Part. 8: Thermal electrical relays
Стандарт МЭК 255-8 Термические(тепловые) защиты на фран и англ языке. 1990 г.

CONTENTS
Foreword
Preface
SECTION ONE - GENERAL
Scope and object
Definitions
SECTION TWO - REQUIREMENTS
Standard values
Accuracy
SECTION THREE - TEST METHODS
Tests related to operating characteristics and accuracy
Tests for thermal requirements
Figures
Appendix A - Characteristic curves, cold curves
Appendix B - Characteristic curves, hot curves
Appendix C - Example for determining accuracy
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