21, distance relay, 27, undervoltage relay, 32, directional power relay, 37, undercurrent relay, 50, instantaneous overcurrent relay, 51, AC inverse time overcurrent relay, 52, AC circuit breaker, 55, power factor relay, 59, overvoltage relay, 65, governor, 72, DC circuit breaker, 87, differential protective relay, 86, lockout relay, 70, rheostat, 81, frequency relay.

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