{"id":33592,"date":"2026-09-16T06:59:41","date_gmt":"2026-09-16T06:59:41","guid":{"rendered":"https:\/\/fenchenergy.com\/?post_type=product&p=33592"},"modified":"2026-10-26T01:21:30","modified_gmt":"2026-10-26T01:21:30","slug":"220a-dc-circuit-breaker-mccb-diy-battery-box","status":"publish","type":"product","link":"https:\/\/fenchenergy.com\/cs\/product\/220a-dc-circuit-breaker-mccb-diy-battery-box\/","title":{"rendered":"220A DC jisti\u010d MCCB pro DIY bateriov\u00e9 boxy | 2-p\u00f3lov\u00fd bateriov\u00fd izol\u00e1tor, sklad EU"},"content":{"rendered":"
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A 220A DC circuit breaker does one job your BMS cannot do on its own: it gives you a physical break in the circuit.<\/strong> Your BMS protects the cells from over-current and short circuits, but when you need to work on the pack, isolate the inverter, or cut the power in an emergency, you need something you can actually switch off. This 2-pole DC breaker sits between your battery and your inverter, adds short-circuit protection on top of the BMS, and gives you a visible disconnect point.<\/p>

Why a 220A DC Circuit Breaker Beats Relying on the BMS Alone<\/h3>

A BMS is a protection device, not a switch. It will cut the current when something goes wrong, but it will not let you isolate the pack on demand \u2014 and it will not clear a hard short circuit on the main DC feed the way a breaker does. Adding a breaker gives you three things a BMS alone cannot:<\/p>

  • A manual disconnect<\/strong> for maintenance, upgrades and emergencies<\/li>
  • Short-circuit clearing<\/strong> rated at 7.5kA<\/li>
  • A fault you can see<\/strong> \u2014 a tripped breaker shows you something happened, instead of leaving you guessing<\/li><\/ul>

    AC breakers do not belong on a battery circuit<\/h4>

    This is the mistake that matters most. Alternating current passes through zero 50-60 times a second, and that zero crossing is what lets an AC breaker extinguish the arc when it trips. Direct current has no zero crossing, so the arc keeps burning. An AC breaker can fail to clear a fault on a battery system, which is exactly the situation a breaker is supposed to solve.<\/p>

    What the 220A Rating Means in Practice<\/h3>

    The most common configuration in a DIY storage pack is a 200A BMS. This breaker is rated 220A, one step above that, which gives you margin for inrush current without oversizing the device or the cable.<\/p>

    Your BMS<\/th>Breaker to choose<\/th><\/tr><\/thead>
    200A \u2014 the standard DIY build<\/td>220A (this model \u2014 BCPS2DM220)<\/strong><\/td><\/tr>
    Larger packs needing more headroom<\/td>250A (BCPS2DM250)<\/td><\/tr>
    300A BMS and high-output systems<\/td>300A (BCPS2DM300)<\/td><\/tr><\/tbody><\/table><\/div><\/div>

    One rule that matters more than the table: never fit a breaker rated below your system’s continuous current, and never fit a cable rated below the breaker.<\/p>

    Reading the Label: DC Rating and Breaking Capacity<\/h3>
    Marking<\/th>What it means<\/th><\/tr><\/thead>
    125\/250V DC<\/strong><\/td>DC voltage rating \u2014 125V per pole, 250V with both poles<\/td><\/tr>
    2P<\/strong><\/td>Two poles, breaking together<\/td><\/tr>
    220A<\/strong><\/td>Rated continuous current<\/td><\/tr>
    Icu\/Ics 7.5kA<\/strong><\/td>Short-circuit breaking capacity<\/td><\/tr>
    IEC 60947-2<\/strong><\/td>The switchgear standard the device is marked to<\/td><\/tr><\/tbody><\/table><\/div><\/div>

    Fitting a DC Circuit Breaker Into a DIY Battery Box<\/h3>

    At 78 \u00d7 38 \u00d7 63mm and 225g, this breaker fits inside a battery enclosure or a tight cabinet instead of needing its own panel.<\/p>

    1. Mount it where you can reach it.<\/strong> A breaker you cannot access is decoration.<\/li>
    2. Follow the LINE and LOAD markings<\/strong>, and confirm the wiring diagram in the manual before connecting.<\/li>
    3. Torque the terminals to spec<\/strong> and re-check after the first thermal cycle.<\/li>
    4. Keep AC and DC separate.<\/strong> This device goes on the DC side between battery and inverter.<\/li>
    5. Leave room for the cables.<\/strong> Thick DC cable needs bend radius.<\/li><\/ol>

      Specifications<\/h3>
      Parametr<\/th>Specifikace<\/th><\/tr><\/thead>
      Model<\/td>BCPS2DM220<\/td><\/tr>
      Type<\/td>2-pole DC circuit breaker (MCCB)<\/td><\/tr>
      Rated current<\/td>220A<\/td><\/tr>
      Voltage rating<\/td>125\/250V DC<\/td><\/tr>
      Breaking capacity<\/td>Icu\/Ics 7.5kA<\/td><\/tr>
      Dimensions<\/td>78 \u00d7 38 \u00d7 63mm<\/td><\/tr>
      Hmotnost<\/td>225g<\/td><\/tr>
      Application<\/td>Short-circuit protection and manual isolation for battery boxes<\/td><\/tr>
      Standard marking<\/td>IEC 60947-2<\/td><\/tr>
      Shipping<\/td>EU stock, DDP delivery from Poland<\/td><\/tr><\/tbody><\/table><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

      \ud83d\udd0c 220A DC Circuit Breaker MCCB \u2014 2-Pole Battery Isolator
      \n\u2705 DC-rated 2-pole breaker for DIY battery boxes | 125\/250V DC
      \n\u26a1 220A rated | Icu\/Ics 7.5kA short-circuit breaking capacity
      \n\ud83d\udd17 Matches 200A BMS builds \u2014 JK V19 200A and similar
      \n\ud83d\udcd0 Compact 78 \u00d7 38 \u00d7 63mm | 225g | installs inside the enclosure
      \n\u26a0\ufe0f Breaker only \u2014 box, BMS and cells are NOT included
      \n\ud83d\ude9a Sklad EU | Sklad v Polsku<\/p>","protected":false},"featured_media":33593,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[305],"product_tag":[],"class_list":["post-33592","product","type-product","status-publish","has-post-thumbnail","product_cat-accessories-parts","first","instock","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/product\/33592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/comments?post=33592"}],"version-history":[{"count":1,"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/product\/33592\/revisions"}],"predecessor-version":[{"id":34240,"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/product\/33592\/revisions\/34240"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/media\/33593"}],"wp:attachment":[{"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/media?parent=33592"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/product_brand?post=33592"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/product_cat?post=33592"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/fenchenergy.com\/cs\/wp-json\/wp\/v2\/product_tag?post=33592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}