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If current is flowing through the load contacts, it causes arcing across the contacts as they open. The arcing can oxidize, pit, and melt the contacts. This process can increase the contact resistance, superheat the relay, and lead to fires. Power fault circuit interrupters are designed to prevent fires from low voltage across loads. [citation ...
The schematic diagrams for relay logic circuits are often called line diagrams, because the inputs and outputs are essentially drawn in a series of lines. A relay logic circuit is an electrical network consisting of lines, or rungs, in which each line or rung must have continuity to enable the output device. A typical circuit consists of a ...
A double-switched relay cannot close inadvertently with the application of the same current. At least two separate faults would be required to allow this relay to close inadvertently. Double switching , double cutting , or double breaking is the practice of using a multipole switch to close or open both the positive and negative sides of a DC ...
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