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IEC 60255-3 Ed. 2.0 b:1989

Electrical relays - Part 3: Single input energizing quantity measuring relays with dependent or independent time

Definitions. Standard values relating to energizing quantities influencing quantities. Fundamental characteristics relating to temperature rises and behaviour in service. Accuracy requirements relating to the characteristic quantity and specified times. Mechanical and electrical requirements. Markings and data. Methods of measurement.

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International Electrotechnical Commission [iec]
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