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IEC 60255-12:1980 ed1.0

Действует
Electrical relays - Part 12: Directional relays and power relays with two input energizing quantities — 26 стр.
Specifies performance requirements for the subfamily as shown in the title. This publication forms part of a series dealing with measuring relays with more than one input energizing quantity and for which IEC 60255-6 gives the general requirements.
ICS
29.120.70 Relays / Реле