Use of relay contact protective devices or protection circuits for an inductive load can suppress the counter EMF (electromotive force or electromagnetic field) to a low level. However, note that incorrect use will result in an adverse effect. Typical contact protection circuits are given in the table below, please note AC or DC applications.
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Figure 1. Image of Relay Contact Protection Circuits
Source - Panasonic General Application Guidelines
Related Topics
Relays, Switches, and Electrical Contacts in General
Common Contact Base Materials
Tips for Relay Operation
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Related Terms
cr rc circuit
diode
zener
varistor
contactors