Briseoir Ciorcad DC 300A MCCB do Bhoscaí Ceallraí DIY | Scaradóir Ceallraí 2-Phóil, Stoc AE

A 300A DC circuit breaker does one job your BMS cannot do on its own: it gives you a physical break in the circuit. Cosnaíonn do BMS na cealla ó ró-reatha agus ciorcaid ghearra, ach nuair is gá duit obair a dhéanamh ar an bpacáiste, an inverter a scaradh, nó an chumhacht a ghearradh i gcás éigeandála, tá rud éigin uait is féidir leat a mhúchadh i ndáiríre. Suíonn an briseoir DC 2-phóil seo idir do cheallraí agus do inverter, cuireann sé cosaint ciorcaid ghearra leis an BMS, agus tugann sé pointe dícheangail le feiceáil duit.

Why a 300A DC Circuit Breaker Beats Relying on the BMS Alone

Is gléas cosanta é BMS, ní lasc é. Gearrfaidh sé an reatha nuair a théann rud éigin mícheart, ach ní ligfidh sé duit an pacáiste a scaradh ar éileamh — agus ní ghlanfaidh sé ciorcad ghearr crua ar an bpríomhsholáthar DC mar a dhéanann briseoir. Tugann breiseán briseora trí rud duit nach féidir le BMS amháin:

• Dícheangal láimhe do chothabháil, uasghrádú agus éigeandálaí
• Glanadh ciorcad ghearr rátáilte ag 7.5kA
• Locht is féidir leat a fheiceáil — taispeánann briseoir a thit rud éigin a tharla, seachas tú a fhágáil ag buille faoi thuairim

Níor cheart briseoirí AC a chur ar chiorcad ceallraí

Is é seo an botún is tábhachtaí. Téann reatha malartach tríd an nialas 50-60 uair sa soicind, agus is é an trasnú nialais sin a ligeann do bhriseoir AC an t-arc a mhúchadh nuair a thiteann sé. Níl trasnú nialais ag reatha dhíreach, mar sin leanann an t-arc ag dó. D'fhéadfadh briseoir AC teip ar locht a ghlanadh ar chóras ceallraí, agus sin go díreach an cás a bhfuil briseoir ann chun a réiteach.

Choosing a 300A DC Circuit Breaker for High-Output Systems

300A is the top of this series. Choose it when your system genuinely runs at that level:

• You run a 300A BMS
• You have an inverter drawing close to the BMS limit on a continuous basis
• You are running more than one inverter, or plan to add one
• Your load profile is high and sustained rather than short bursts
• You want no margin compromise — the breaker stays above everything downstream

One warning that matters more than the table: at 300A the cable becomes the bottleneck. A 300A breaker does not make an undersized cable safe — size the cable for the current first, and make sure your terminals and busbars are rated for it too.

Ag léamh an Lipéid: Rátáil DC agus Cumhacht Briseadh

Fitting a DC Circuit Breaker Into a DIY Battery Box

At 78 × 38 × 63mm and 225g, this breaker fits inside a battery enclosure or a tight cabinet instead of needing its own panel.

1. Mount it where you can reach it. A breaker you cannot access is decoration.
2. Follow the LINE and LOAD markings, and confirm the wiring diagram in the manual before connecting.
3. Torque the terminals to spec and re-check after the first thermal cycle.
4. Keep AC and DC separate. This device goes on the DC side between battery and inverter; the AC output side needs its own AC breakers.
5. Check heat at full load. High-current builds warm up; leave airflow around the breaker and check terminal temperature after the first hour at full load.

Sonraí

Not included: the battery box, the BMS and the battery cells. This listing is the circuit breaker only.

Ceisteanna Coitianta

Which systems need a 300A DC circuit breaker?
300A BMS builds, systems with inverter loads running close to the BMS limit, and installations with more than one inverter.

Can I use a smaller breaker to save money?
No. A breaker rated below your system’s continuous current will nuisance-trip. Size at or just above your continuous current.

Can I use an AC breaker on a battery circuit instead?
No. DC arcs do not self-extinguish, so an AC breaker may fail to clear a fault. This device is DC-rated at 125/250V DC.

How much short-circuit current can it clear?
7.5kA (Icu/Ics).

Will it fit inside my battery box?
At 78 × 38 × 63mm and 225g it fits most DIY enclosures. Send us the mounting space if you are unsure.

Do you make other ratings?
Yes — 220A (BCPS2DM220) and 250A (BCPS2DM250) in the same series.

Does it come with the box, BMS or cells?
No. This listing is the breaker only.

Related: Battery Box Parts and Accessories

Building a complete pack? Pair the breaker with a DIY battery box kit, a battery box base, a set of battery box wheels, and a JK BMS heating pad if you charge in cold weather. Cells in 280Ah, 314Ah and 320Ah are available from the same warehouse.