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Old 01-30-2014, 03:26 AM   #21
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Originally Posted by kal View Post
The ones I've designed use 2 HOT, 1 NEUTRAL, and 1 GROUND. You don't need the neutral if you don't have any 120V devices. Depends on how you design it.


Afraid I don't understand what you're asking. (breaker panel instead of a contractor). Can you post a schematic or diagram?

Kal
he wants to mount breakers in the control panel instead of switch activated contacter relays to switch power... you could do it but a switch and relays preventing two elements from running at once is better if you have only a 30a line.
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Old 01-30-2014, 05:11 AM   #22
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I don't understand. You can't replace contactors with breakers. They serve completely different purposes.

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Old 01-30-2014, 11:30 AM   #23
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Old 01-30-2014, 06:41 PM   #24
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the circuit breakers in this diagram do not replace the contractors or (solid state relay) SSR, they are protection for the element in this configuration as I understand it. If you trace out the two hot legs ( red and Blue) the red leg is controlled by the SSR , and the SSR is controlled by the PID. The blue leg is controlled by the 30A contactor, and the contactor is controlled by the green selector switched.

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Old 01-30-2014, 06:58 PM   #25
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the circuit breakers in this diagram do not replace the contractors or (solid state relay) SSR, they are protection for the element in this configuration as I understand it. If you trace out the two hot legs ( red and Blue) the red leg is controlled by the SSR , and the SSR is controlled by the PID. The blue leg is controlled by the 30A contactor, and the contactor is controlled by the green selector switched.
Circuit breakers don't protect devices, they protect the wire. Chances are very high that if you have a short, your device is already ruined anyways. A shorted SSR will get smoked before the CB even opens. A shorted wire will heat above the annealing point fairly quickly, at which point it's physical properties are permanently changed.

If you have a device that frequently gets shorted you can get special semiconductor based fuses that will open in micro seconds instead of milliseconds.
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Old 01-30-2014, 08:56 PM   #26
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Circuit breakers don't protect devices, they protect the wire. Chances are very high that if you have a short, your device is already ruined anyways. A shorted SSR will get smoked before the CB even opens. A shorted wire will heat above the annealing point fairly quickly, at which point it's physical properties are permanently changed.

If you have a device that frequently gets shorted you can get special semiconductor based fuses that will open in micro seconds instead of milliseconds.
Thanks that makes sense.

I guess thats why you run a fuse that is below the amperage of the circuit breaker but above the amperage of the device the circuit is running, so the fuse in the protection for the device. That sound about right?
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Old 01-30-2014, 11:51 PM   #27
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Thanks for the responses guys. Although electrical is a foreign language to me I appreciate the input. I'm thinking I'll just buy Kal's book and build it out according to that since plenty of folks have without issue. The only system feature his design doesn't have that I want is a E-Stop.

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