Indicating and auxiliary low voltage protective relays. General technical requirements
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Power-directional relays. General technical requirements
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Weak-current electromagnetic relays
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Electromagnetic relays. General specifications
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Unified system for design documentation. Graphic identifications in electrical schemes. Protective relays
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Time relays. General specifications
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Single input energizing quantity measuring relays with non-specified time or with independent specified time
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Electrical relays. Interruptions to and alternating component (ripple) in d. c. Auxiliary energizing quantities of measuring relays
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Single input energizing quantity measuring relays with dependent specified time
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All-or-nothing electrical relay. Application of the IEC quality assessment system for electronic components to all-or-nothing relays
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Electrical relays. Insulation test
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