I've been looking at options for a DC circuit breaker to put on my battery output. It needs to be at least 125 A at 24 V (nominal 3kW system), but given that the inverter can handle 2x rated power for some seconds, perhaps I need to be looking even higher (200A?).
I've found the "regular" kind of thing (eg Noark DC breakerhttps://www.offgridcompany.com.au/noark-2p-dc-mccb ), which seems to be called a "moulded case circuit breaker (MCCB)". These match my expectation.
However, I've also found a number of alternatives that seem to have similar current specs but are much cheaper. They are often sold as "marine" or "automotive" circuit breakers (eghttps://www.ebay.com.au/itm/DC48V-250AMP-Waterproof-Surface-Mount-Circuit-Breaker-with-Manual-Reset-Type/401304387434?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20180105095853%26meid%3Dbe79e24fa8bb4bd8bae35e1ae18c2bb4%26pid%3D100903%26rk%3D1%26rkt%3D20%26sd%3D401304387434%26itm%3D401304387434&_trksid=p2509164.c100903.m5276 ).
My gut feeling is to not trust these marine breakers for a home battery installation, because there has to be some catch with their cost being 1/5 of the MCCB. What is the story here?
I've found the "regular" kind of thing (eg Noark DC breakerhttps://www.offgridcompany.com.au/noark-2p-dc-mccb ), which seems to be called a "moulded case circuit breaker (MCCB)". These match my expectation.
However, I've also found a number of alternatives that seem to have similar current specs but are much cheaper. They are often sold as "marine" or "automotive" circuit breakers (eghttps://www.ebay.com.au/itm/DC48V-250AMP-Waterproof-Surface-Mount-Circuit-Breaker-with-Manual-Reset-Type/401304387434?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20180105095853%26meid%3Dbe79e24fa8bb4bd8bae35e1ae18c2bb4%26pid%3D100903%26rk%3D1%26rkt%3D20%26sd%3D401304387434%26itm%3D401304387434&_trksid=p2509164.c100903.m5276 ).
My gut feeling is to not trust these marine breakers for a home battery installation, because there has to be some catch with their cost being 1/5 of the MCCB. What is the story here?