Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

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Protection functions

Tripping or trip-free relay

Initiates a tripping action or provides the trip-related logic described in the scheme.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEEE / ANSI

A distinction that matters

A trip relay 94 need not have the latching reset behaviour of lockout device 86.

Full reference

Protection functions

Lockout

A lockout function or device latches an operating condition and participates in the specified trip or blocking arrangement. Its reset and implementation depend on the selected scheme. It can be realised in physical equipment or through documented control logic.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEEE / ANSI

A distinction that matters

A lockout reference is not a mechanical isolation procedure and does not itself establish an authorised operating instruction.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.