Relays and contactors use a variety of technologies to switch signals and power connections. Many devices called relays use similar techniques and topologies, but the terminology can be confusing.

Bob is a service technician who is well trained and nationally certified. However, he sometimes suffers from the same confusion that all technicians occasionally do - the facts that he gathers may or ...

A dirty term in our industry is “call back,” meaning a system that a technician just repaired is not working, and it becomes necessary to go back and repair the problem again. This is especially true ...