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Rating of circuit breaker for protection.

Kiwi

Jan 28, 2013
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That circuit breaker is rated for voltages from 12v -48v, so is perfect for a 24v installation.
I would suggest using a circuit breaker with a higher current rating than the maximum alternator output.
They list a 150A circuit breaker, so would use that instead of the 100A one.

How long is the cable from the alternator to the battery?
 

kellys_eye

Jun 25, 2010
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More than the rating of the breaker is the rating of the CABLE being used to connect things. The breaker must NEVER exceed the rating of the cable - which itself is dependent on current and length - else you're claiming on your fire insurance.

The other importance of that breaker is that it is rated for DC - many people assume they can use similarly rated breakers designed for AC operation - it's not the same, don't do it!

The quoted breaker is fine for ANY DC voltage up to the rated maximum (48V).

BTW most alternators are over-rated. Use at their full rated output is usually for a limited period (peak usage). If you want to run at 100A then get an alternator rated at 150A.
 

kellys_eye

Jun 25, 2010
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I sent a 'faux' circuit breaker to BigClive (Youtube) some time ago and the video proved quite popular!

 

Delta Prime

Jul 29, 2020
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I sent a 'faux' circuit breaker to BigClive (Youtube) some time ago and the video proved quite popular!
I can't understand big Clive and his or her cuticles need attention. Makes me want to poke my eyeball out!
:cool:
 
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Kiwi

Jan 28, 2013
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WOW!, I wonder how many of those fakes are installed around the world?
 

steveaustin714

Sep 21, 2023
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Using a 48V circuit breaker in a 24V system is not recommended. It's crucial to match the voltage rating of the circuit breaker with your system, so for a 24V system, opt for a 24V circuit breaker. Using a mismatched voltage may result in ineffective protection and potential damage to your system. Always ensure the components are compatible for optimal performance and safety before installation.
 

Delta Prime

Jul 29, 2020
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Using a 48V circuit breaker in a 24V system is not recommended. It's crucial to match the voltage rating of the circuit breaker with your system, so for a 24V system, opt for a 24V circuit breaker. Using a mismatched voltage may result in ineffective protection and potential damage to your system. Always ensure the components are compatible for optimal performance and safety before installation.
I guess we must get use to ( AI) responses; so no harm no foul.
If you make them by the thousands or millions,
(manufacturer) then yes.
You can always exceed guidelines; rules by institutions or governing bodies .NEC overcurrent protection for equipment and conductors.
 

kellys_eye

Jun 25, 2010
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Using a 48V circuit breaker in a 24V system is not recommended. It's crucial to match the voltage rating of the circuit breaker with your system, so for a 24V system, opt for a 24V circuit breaker. Using a mismatched voltage may result in ineffective protection and potential damage to your system. Always ensure the components are compatible for optimal performance and safety before installation.
Assuming this is an AI response it doesn't exactly fill one with the 'dread' we're supposed to feel - moreover it makes me 'sad' that it can't even get something so basic as circuit breaker ratings correct. Dumb as a rock.
 

Delta Prime

Jul 29, 2020
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Assuming this is an AI response it doesn't exactly fill one with the 'dread' we're supposed to feel - moreover it makes me 'sad' that it can't even get something so basic as circuit breaker ratings correct. Dumb as a rock.
I'd have to admit; I would turn it over. o_O

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