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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