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Question
Choosing from among CR elements, diodes, varistors, and other kinds of surge suppressor elements, which is the most effective for protecting contacts?
Answer
For a DC load, a diode is generally the most effective, and the next most effective is CR elements. For an AC load, a varistor or CR elements are the most effective.
Typical Surge Suppressor Examples:
Do not use the following kind of surge suppressor application.
It is commonly believed that it is more difficult to switch DC inductive loads than resistive loads, but the performance can be improved to about the same level as resistive loads by using a surge suppressor.