Continued from page 1
Inspecting heater size - Heaters can oxidize over a period of time and become smaller in cross section. The smaller current flowing in smaller heater generates same amount of heat to cause unnecessary tripping of relay.
With careful selection and maintenance, overload relays are excellent for motor protection.
The wide use of thermal overload relays in industry attests to their acceptance as most practical means of protecting motors from overloads. And they are most economical solution available.
Until next time...
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