250A DC odklopnik MCCB za DIY baterijske škatle | 2-polni baterijski izolator, zaloga EU

A 250A DC circuit breaker does one job your BMS cannot do on its own: it gives you a physical break in the circuit. Vaš BMS ščiti celice pred prekomernim tokom in kratkimi stiki, vendar ko morate delati na paketu, izolirati inverter ali izklopiti napajanje v sili, potrebujete nekaj, kar lahko dejansko izklopite. Ta 2-polni DC odklopnik sedi med vašo baterijo in inverterjem, doda zaščito pred kratkim stikom poleg BMS in vam daje vidno točko za odklop.

Why a 250A DC Circuit Breaker Beats Relying on the BMS Alone

BMS je zaščitna naprava, ne stikalo. Prekine tok, ko nekaj ni v redu, vendar vam ne omogoča, da po potrebi izolirate paket — in ne bo odpravil trdega kratkega stika na glavni DC napajalni liniji tako kot odklopnik. Dodajanje odklopnika vam prinese tri stvari, ki jih BMS sam ne more:

• Ročni odklop za vzdrževanje, nadgradnje in nujne primere
• Odpravljanje kratkega stika ocenjeno na 7,5kA
• Napaka, ki jo lahko vidite — sprožen odklopnik vam pokaže, da se je nekaj zgodilo, namesto da bi vas pustil ugibati

AC odklopniki ne sodijo v baterijsko vezje

To je največja napaka. Izmenični tok prehaja skozi ničlo 50-60 krat na sekundo, in ta ničelni prehod omogoča AC odklopniku, da ugasne oblok, ko se sproži. Enosmerni tok nima ničelnega prehoda, zato oblok še naprej gori. AC odklopnik lahko ne uspe odpraviti napake v baterijskem sistemu, kar je prav situacija, ki jo mora odklopnik rešiti.

When to Step Up to a 250A DC Circuit Breaker

Pick 250A if any of these describes your build:

• You run a 250A BMS, not the standard 200A
• Your 200A system feeds surge-heavy equipment — well pumps, compressors, EV charging, welding gear
• You have a large pack and want more margin than the 220A model gives
• You want to leave room for adding a second inverter later

Two rules matter more than the table: never fit a breaker rated below your system’s continuous current, and never fit a cable rated below the breaker.

Branje etikete: DC ocena in zmogljivost prekinjanja

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. Leave room for the cables. At 250A the DC cable is thick — it needs bend radius, and the terminals need clearance.

Specifikacije

Ni vključeno: the battery box, the BMS and the battery cells. This listing is the circuit breaker only.

Pogosta vprašanja

When should I choose a 250A DC circuit breaker instead of 220A?
When you run a 250A BMS, or a 200A system with surge-heavy loads such as pumps, compressors or EV charging. Both models are the same size and share the same 7.5kA rating — only the current rating differs.

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 300A (BCPS2DM300) 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.