Time element stick relay is coded as which?

• A. Us
• B. V
• C. Tp
• D. Ur

Answer: (A)

Timing-element codes in relay diagrams use two-letter designations to identify the specific device involved. For a time element associated with a stick relay, the conventional code is Us. This code is part of the standard coding scheme used in signal maintenance practice to quickly recognize that this element is a time-based action wired to a stick relay, as opposed to other timing or control devices. The remaining options are codes used for other components and do not apply to the time element stick relay, which is why Us is the appropriate designation. Mastery of these codes helps you interpret relay circuits and their timing behavior rapidly when you study maintenance tests or schematics.