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Scope: Lockout relays used in MV/HV protection systems (ANSI 86 / trip lockout), including panel-mount and draw-out types, seal-in/hand-reset, trip-circuit supervision, and accessories (target flags, contacts, test blocks). Not protection IEDs.   Why lockout relays decide project reliability When faults escalate, the 86 device must latch, hold the trip, and refuse re-energization until a deliberate reset. Missed latching, sticky targets, or weak contacts can turn a correct tr