Rating of circuit breaker for protection.

[james41121]

This circuit breaker is rated as 12V-48V 100A and I have to use this circuit breaker between additional alternator (24V 100A) in my vehicle and additional battery bank to provide overcurrent/short circuit protection. Will it be efficient to my 24V system or is not recommended using a 48V circuit breaker to protect my 24V system.
https://www.amazon.com/Erayco-Circuit-Trolling-12V-48VDC-Waterproof/dp/B08JQBZ985

 

[Kiwi]

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]

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.

 

[Bluejets]

This circuit breaker is rated as 12V-48V 100A

Don't be too surprised if you run that kind of current through that thing ($18...wow!!!! )and arrive to find a melted blob of plastic.

 

[kellys_eye]

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

 

[Delta Prime]

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!

 

[Kiwi]

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

 

[steveaustin714]

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]

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.

National Electrical Code Basics: Overcurrent Protection Part 3 - Technical Articles

Learn the rules to tap a feeder without overcurrent protection at the supply point.

eepower.com

 

[kellys_eye]

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]

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.