IS: 3231 (Part 1/Sec. 1) - 1986 (Reaffirmed 1992); Specification for electrical relays for power system protection Part 1 General requirements Section 1 contact performance

IS: 3231 (Part 1/Sec. 1) - 1986 (Reaffirmed 1992); Specification for electrical relays for power system protection Part 1 General requirements Section 1 contact performance - New Delhi BIS 1987 - 5p

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