Time element relay for time or approach release / Time element unit (mechanical) is coded as which?

• A. U
• B. Ug
• C. Ugt
• D. Ur

Answer: (A)

In signaling coding, time element devices are identified by a simple symbol that shows the type of timing element. For the time element relay used for time or approach release, specifically the mechanical time element unit, the standard designation is the single-letter symbol. This simplest code signals the basic mechanical timing unit without any added features.

Why this fits best: the question points to the basic mechanical time element unit, not a variant with extra features. When additional characteristics (like gravity release or other special configurations) are present, the code would include modifiers to indicate those differences. Since you’re dealing with the standard mechanical time element unit, the single-symbol code is the correct, simplest designation.