UL certification is a safety certification provided by Underwriters Laboratories Inc. (UL). It is one of the most recognized and respected certification marks globally and…
What does CE certification of a product mean?
CE certification – the acronym for the French “Conformité Européenne,” which translates to European conformity – is mandatory for all non-food products sold in the…
What does FCC Certification of a product mean?
By law, any electronic device that utilizes radio frequency (RF) technology or emits – either by design or as a byproduct – radio frequency energy,…
What is a Form B relay, and when should they be used?
Form B relays (or normally closed/NC relay) have a single set of contacts that are normally closed, meaning the circuit is closed when the relay…
What is a form C relay, and when should they be used?
Form C (or changeover/CO) relays have a set of normally open contacts and a set of normally closed contacts. When the relay is not energized,…
What are the major types of electromechanical relays?
General Purpose Relays General purpose relays are cheap, easily replaceable, and are used for troubleshooting and other low priority switching applications. These relays follow a…
How does an electromechanical relay work?
An electromechanical relay uses a physical moving part to connect contacts within the output component of the relay. The movement of this contact is caused…
When was the electromagnetic relay invented?
Although there were several precursors that could be considered relays, the invention of the electromagnetic relay is attributed to Joseph Henry in 1835. Henry’s original…
What are relays?
A relay is a switch powered by a relatively small electric current that can turn a much larger electric current on or off. Essentially, relays…