My professor asked us to check for the type of relay and why the wiring was done this way. I google it but I did not have any luck. Does anybody know?
Hello Carlos, The relays shown are typically called power relays. Your question as the the reason the wiring was done in this fashion is hard to say without seeing how it was connected into the apparatus or building...two relays sharing the same load but controlled independently (assumed) and absent any type of holding circuit not shown, momentary in operation.
The bigger question concerns the lack of proper workmanship, and judging by the evidence of heating at the connections, improper selection of components. It looks like it was assembled from scraps laying in the bottom of a junk drawer.
Steve thanks for your response. My professor recollects electrical items and always ask us to figure out what is their use. Sometimes we find out they were used incorrectly and we start a conversation about it. Certainly, it is hard for me to figure out what they were connected to because I do not have more information.
This is what I can tell from looking at the image
The relays have one normally open contact. The two contacts are wired in parallel, meaning that a complete circuit would be made if either of those relays were to close. The coils of the two relays are wired in parallel as well, meaning that if there were two separate sources for those coils either one of them would close a contact making a complete circuit. This style of circuit arrangement is common on safety circuits where it is required that an initiating signal triggers an alarm or function, and in this case the initiating circuit is "backed up" to ensure that the system has a small amount of redundancy.
David, thanks for your response!
These are Square D Power Relays; SPST (Double-Break).
It can also be called a "OR Gate", where mechanical relays are wired so as to duplicate a solid-state circuit called an OR Gate. Energizing relay #1 OR relay #2 (OR both) will cause the relay(s) to energize the output device.
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