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.

First referenceCompare with

HOURS

IEEE / ANSI

ANSI/IEEE running-hours meter symbol

The hour-meter form identifies elapsed-time accumulation while its specified enabling condition is active. The circuit should make clear whether this condition is supply energisation, equipment running feedback or another declared event.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEEE / ANSI / Manufacturer
Form evidence: Autodesk IEEE-oriented Instrumentation and Sensors functional form. Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

An hour meter accumulates duration; an operation counter counts discrete events.

Full reference

HOURS

Symbols

Running-hours meter

A running-hours meter accumulates elapsed time while its specified enabling condition is active. The schematic must show what condition is counted, such as a running feedback contact or an energised supply.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEC / Manufacturer

A distinction that matters

A running-hours meter measures duration; an operation counter counts events.

Full reference

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