Question

what does 87 or 5 stand for in the automotive relay terminal labeling systems? select one: a. one end of the relay winding b. common-movable switch contact c. nc fixed contact to the common d. no fixed contact to the common

Explanation:

In automotive relay terminal labeling systems, terminal 87 (or 5 in some systems) is typically the normally - open (NO) fixed contact to the common. Terminal designations in relays have specific meanings. The relay winding ends are usually labeled differently (e.g., 85 and 86 in a common 4 - terminal relay). The common - movable switch contact is a different concept related to the switch mechanism's movement. The NC (normally - closed) fixed contact to the common would be a different terminal (e.g., 87a in some cases). So, 87 (or 5) stands for the NO fixed contact to the common.

Answer:

d. NO fixed contact to the common