Dc breaker

Warfyboy said:

I got the non polarity breaker. Page 1, 2nd link from Amazon. Only took 4 days to come from USA. But a lot of people saying class t fuse are best. I would of went with a fuse but don’t have to crimping tools for end of cables.

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Warfyboy said:

I got the non polarity breaker. Page 1, 2nd link from Amazon. Only took 4 days to come from USA. But a lot of people saying class t fuse are best. I would of went with a fuse but don’t have to crimping tools for end of cables.

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chess-equality said:

There are cables sold that are already crimped/lugged, did you also consider them?

Another "issue" about this type of breaker is that there is a limit of wire AWG size that you can shove into it.

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chess-equality said:

Best to follow these advises; 20kA AIC is probably the minimum.

Get a T Class fuse, or a DC MCCB (not MCB), if you prefer a breaker / isolator switch, but yes as stated above, MCCBs are more expensive.

Also, watch out if AC/DC or AC only, and polarized / non-polarized. Sometimes they will spec both AC and DC AIC ratings. MCCBs are usually non-polarized.

I will never use an MCB for inverter to battery, or battery to battery.

For inverter to battery bank, I'm using 3 DC MCCBs for my 3 parallel systems; 2 Chinese brands (both with 20kA Icu), and a Schneider EasyPact EZC250H with 30kA Icu. All 3 of them are capable of both AC and DC, and non-polarized.

For each battery, I'm using ANL fuses, but I'm considering T Class for them (for dead short in case of failure).

These are more expensive than others, but they are the best OCP devices in their classes, and gives you peace of mind.

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meetyg said:

Which Chinese brand MCCB are you using?
How do you know for sure that they are non-polarized ? I got three TAIXI DC MCCBs from Ali. Seller claims they are non polarized (in regards to where the load should be connected), but forum members think otherwise. I'm really confused.

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160A 2P DC Molded Case Circuit Breaker

The Suntree DC Molded Case Circuit Breaker is designed to protect DC electrical installations against overloads and short circuits with both the thermal and magnetic tripping mechanism equipped. Once a fault is detected, the circuit breaker automatically switches off the electrical circuit to...

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