{"id":3352,"date":"2026-08-04T17:00:00","date_gmt":"2026-08-04T17:00:00","guid":{"rendered":"https:\/\/chac-electric.com\/?p=3352"},"modified":"2026-10-14T06:50:39","modified_gmt":"2026-10-14T06:50:39","slug":"%d8%a7%d8%ae%d8%aa%d9%8a%d8%a7%d8%b1-%d9%82%d8%a7%d8%b7%d8%b9-%d8%a7%d9%84%d8%af%d8%a7%d8%a6%d8%b1%d8%a9-%d8%a7%d9%84%d9%85%d8%b5%d8%ba%d8%b1-%d8%a3%d8%ad%d8%a7%d8%af%d9%8a-%d8%a7%d9%84%d9%82%d8%b7","status":"publish","type":"post","link":"https:\/\/chac-electric.com\/ar\/blog\/single-pole-vs-double-pole-mcb-selection\/","title":{"rendered":"\u0645\u062a\u0649 \u064a\u062c\u0628 \u0639\u0644\u0649 \u0645\u0635\u0646\u0639\u064a \u0627\u0644\u0644\u062d\u0627\u062a \u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0642\u0627\u0637\u0639 \u062f\u0627\u0626\u0631\u0629 \u0645\u0635\u063a\u0631 \u0623\u062d\u0627\u062f\u064a \u0627\u0644\u0642\u0637\u0628 \u0623\u0648 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0642\u0637\u0628\u061f"},"content":{"rendered":"

Single-pole and double-pole MCB selection begins with the conductors that the circuit must switch and protect. A familiar pole label is not enough: a single-phase circuit may be line-to-neutral or line-to-line, and a two-pole product may have a different protected-pole arrangement<\/a> from another two-pole product.<\/p>\n

\"\u0645\u062a\u0649<\/p>\n

A practical way to frame the pole decision<\/h2>\n

Draw the complete circuit first, including the source, neutral, protective conductor, shared neutrals and the intended isolation point. Then record whether each pole is switched, protected, or both. The MCB selection range<\/a><\/strong> can be reviewed after those inputs are fixed, not before.<\/p>\n

Which conductors must the device disconnect?<\/h2>\n

A single-pole MCB may suit a line conductor where the applicable installation rules permit that arrangement. A double-pole device may be required where line and neutral must open together, but the selected model must document how the neutral pole is treated. Shared or borrowed neutrals are a common reason to stop and redraw the circuit.<\/p>\n

What does a single-pole MCB actually cover?<\/h2>\n

One pole does not automatically describe the entire circuit\u2019s isolation or fault behaviour. Verify the rated voltage, breaking capacity<\/a>, protected pole and the installation rule for the circuit topology. A nominally single-phase supply is not always a line-to-neutral supply.<\/p>\n

\"\u0642\u0627\u0637\u0639<\/p>\n

Why should 1P+N be reviewed separately from 2P?<\/h2>\n

1P+N commonly indicates line-and-neutral switching with overcurrent protection on the line pole, while a 2P device can have another protection arrangement. Treat the labels as a prompt to inspect the wiring diagram and markings, not as interchangeable product names.<\/p>\n

When does a double-pole MCB become the better review route?<\/h2>\n

Consider it when simultaneous disconnection is required by the design or local rules, when the supply arrangement makes both conductors part of the isolation boundary, or when the selected product\u2019s documented ratings match that duty. Pole count does not by itself increase breaking capacity.<\/p>\n

How should the comparison appear on the panel schedule?<\/h2>\n

List the circuit topology, pole configuration, protected poles, AC or DC duty, rated voltage, breaking capacity, trip curve and neutral arrangement as separate fields. This makes supplier responses comparable and exposes missing information before the bill of materials is released.<\/p>\n

Which product pages can support the shortlist?<\/h2>\n

For a model-level check, review the CQB2-63 miniature circuit breaker<\/a><\/strong> page and compare its published configuration with the panel drawing. Related MCB options<\/a> should be treated as separate model reviews.<\/p>\n

When is pole count not enough for final selection?<\/h2>\n

Stop the comparison and return to the responsible designer when the project needs discrimination, local-code interpretation, a DC application, shared neutrals or model-specific approval. IEC 60898-1<\/a> \u0648 IEC 60947-2<\/a> have different scopes, so the applicable standard must be identified rather than assumed.<\/p>\n

For a double-pole MCB selection<\/strong>, the final schedule should show the actual line and neutral arrangement, protected-pole designation and the evidence used to approve the device.<\/p>\n

That record is also useful when a later service change introduces a shared neutral or a different supply topology. The installer can see which assumptions were part of the original approval instead of treating the pole label as a universal rule.<\/p>\n

It also gives the panel reviewer a clear way to reject a nominally similar device when its terminal marking, neutral treatment or permitted voltage does not match the approved circuit.<\/p>\n

\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0645\u062a\u0643\u0631\u0631\u0629<\/h2>\n

\u0627\u0644\u0641\u0631\u0642 \u0627\u0644\u0623\u0633\u0627\u0633\u064a \u0628\u064a\u0646 \u0642\u0627\u0637\u0639 \u0627\u0644\u062f\u0627\u0626\u0631\u0629 \u0627\u0644\u0645\u0635\u063a\u0631 (MCB) \u0623\u062d\u0627\u062f\u064a \u0627\u0644\u0642\u0637\u0628 (1P) \u0648\u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0642\u0637\u0628 (2P) \u0647\u0648 \u0623\u0646 \u0642\u0627\u0637\u0639 1P \u064a\u0642\u0637\u0639 \u0648\u064a\u0641\u0635\u0644 \u0633\u0644\u0643 \u0627\u0644\u062e\u0637 (\u0627\u0644\u0643\u0647\u0631\u0628\u0627\u0621) \u0627\u0644\u062d\u0627\u0631 \u0641\u0642\u0637\u060c \u0628\u064a\u0646\u0645\u0627 \u0642\u0627\u0637\u0639 2P \u064a\u0642\u0637\u0639 \u0648\u064a\u0641\u0635\u0644 \u0643\u0644\u0627 \u0645\u0646 \u0633\u0644\u0643 \u0627\u0644\u062e\u0637 \u0627\u0644\u062d\u0627\u0631 \u0648\u0633\u0644\u0643 \u0627\u0644\u0645\u062d\u0627\u064a\u062f (\u0627\u0644\u0646\u064a\u0648\u062a\u0631\u0627\u0644) \u0641\u064a \u0646\u0641\u0633 \u0627\u0644\u0648\u0642\u062a.<\/h3>\n

\u0642\u0627\u0637\u0639 \u0627\u0644\u062f\u0627\u0626\u0631\u0629 \u0627\u0644\u0645\u0635\u063a\u0631 \u0627\u062d\u0627\u062f\u064a \u0627\u0644\u0642\u0637\u0628 (1P MCB) \u064a\u062d\u062a\u0648\u064a \u0639\u0644\u0649 \u0642\u0637\u0628 \u0648\u0627\u062d\u062f \u0644\u0644\u0645\u0648\u0635\u0644 \u0627\u0644\u0645\u062e\u0635\u0635 \u0644\u0647. \u0642\u0627\u0637\u0639 \u0627\u0644\u062f\u0627\u0626\u0631\u0629 \u0627\u0644\u0645\u0635\u063a\u0631 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0642\u0637\u0628 (2P MCB) \u064a\u062d\u062a\u0648\u064a \u0639\u0644\u0649 \u0642\u0637\u0628\u064a\u0646 \u0645\u0631\u062a\u0628\u0637\u0627\u0646 \u0645\u064a\u0643\u0627\u0646\u064a\u0643\u064a\u0627\u064b \u0648\u064a\u0641\u062a\u062d\u0627\u0646 \u0645\u0639\u0627\u064b. \u064a\u062c\u0628 \u0623\u0646 \u062a\u0624\u0643\u062f \u0648\u062b\u0627\u0626\u0642 \u0627\u0644\u0645\u0646\u062a\u062c \u0627\u0644\u0645\u062e\u062a\u0627\u0631 \u0648\u0638\u064a\u0641\u0629 \u0648\u062a\u0631\u062a\u064a\u0628 \u062d\u0645\u0627\u064a\u0629 \u0643\u0644 \u0642\u0637\u0628.<\/p>\n

\u0647\u0644 1P+N \u0647\u0648 \u0646\u0641\u0633\u0647 2P\u061f<\/h3>\n

\u0644\u0627. \u064a\u064f\u0639\u062a\u0628\u0631 \u0645\u0644\u0635\u0642 (1P+N) \u0645\u0631\u062a\u0628\u0637\u0629 \u0639\u0627\u062f\u0629\u064b \u0628\u062a\u0628\u062f\u064a\u0644 \u0627\u0644\u0637\u0648\u0631 \u0648\u0627\u0644\u0645\u062d\u0627\u064a\u062f \u0645\u0639 \u062d\u0645\u0627\u064a\u0629 \u0636\u062f \u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0632\u0627\u0626\u062f \u0639\u0644\u0649 \u0642\u0637\u0628 \u0627\u0644\u0637\u0648\u0631\u060c \u0628\u064a\u0646\u0645\u0627 \u0642\u062f \u064a\u062d\u062a\u0648\u064a \u0627\u0644\u062c\u0647\u0627\u0632 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0642\u0637\u0628 (2P) \u0639\u0644\u0649 \u062a\u0631\u062a\u064a\u0628 \u0645\u062e\u062a\u0644\u0641 \u0644\u0644\u0623\u0642\u0637\u0627\u0628 \u0627\u0644\u0645\u062d\u0645\u064a\u0629. \u062a\u0623\u0643\u062f \u0645\u0646 \u0645\u062e\u0637\u0637 \u0627\u0644\u0623\u0633\u0644\u0627\u0643 \u0648\u0639\u0644\u0627\u0645\u0627\u062a \u0627\u0644\u0645\u0646\u062a\u062c \u0642\u0628\u0644 \u0627\u0639\u062a\u0628\u0627\u0631\u0647\u0627 \u0628\u062f\u0627\u0626\u0644.<\/p>\n

\u0647\u0644 \u062a\u062b\u0628\u062a \u0627\u0644\u0639\u0644\u0627\u0645\u0629 2P \u0623\u0646 \u0643\u0644\u0627 \u0627\u0644\u0642\u0637\u0628\u064a\u0646 \u0645\u062d\u0645\u064a\u061f<\/h3>\n

\u0644\u0627\u060c \u0639\u062f\u062f \u0627\u0644\u0623\u0642\u0637\u0627\u0628 \u0648\u062d\u062f\u0647\u0627 \u0644\u0627 \u064a\u062d\u062f\u062f \u0643\u064a\u0641\u064a\u0629 \u062d\u0645\u0627\u064a\u0629 \u0643\u0644 \u0642\u0637\u0628. \u0627\u0637\u0644\u0628 \u0648\u0631\u0642\u0629 \u0627\u0644\u0628\u064a\u0627\u0646\u0627\u062a \u0627\u0644\u062e\u0627\u0635\u0629 \u0628\u0627\u0644\u0637\u0631\u0627\u0632 \u0627\u0644\u0645\u062d\u062f\u062f \u0648\u0645\u0639\u0644\u0648\u0645\u0627\u062a \u0627\u0644\u0623\u0633\u0644\u0627\u0643\u060c \u062b\u0645 \u0642\u0627\u0631\u0646\u0647\u0627 \u0628\u0645\u062a\u0637\u0644\u0628\u0627\u062a \u0627\u0644\u062f\u0627\u0626\u0631\u0629.<\/p>\n

\u0647\u0644 \u064a\u0645\u0643\u0646 \u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0642\u0627\u0637\u0639 \u0627\u0644\u062f\u0627\u0626\u0631\u0629 \u0627\u0644\u0645\u0635\u063a\u0631 (MCB) \u0627\u0644\u0645\u062e\u0635\u0635 \u0644\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0646\u0627\u0648\u0628 (AC) \u0641\u064a \u062f\u0627\u0626\u0631\u0629 \u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u0633\u062a\u0645\u0631 (DC)\u061f<\/h3>\n

\u0641\u0642\u0637 \u0639\u0646\u062f\u0645\u0627 \u064a\u0643\u0648\u0646 \u0627\u0644\u062c\u0647\u0627\u0632 \u0627\u0644\u0645\u0630\u0643\u0648\u0631 \u0645\u0635\u0646\u0641\u0627\u064b \u0648\u0645\u0648\u062b\u0642\u0627\u064b \u0635\u0631\u0627\u062d\u0629\u064b \u0644\u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0627\u0644\u0645\u0633\u062a\u0645\u0631 \u0628\u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u0633\u062a\u0645\u0631 (DC) \u0627\u0644\u0645\u0642\u0635\u0648\u062f. \u064a\u062a\u0646\u0627\u0648\u0644 \u0627\u0644\u0645\u0639\u064a\u0627\u0631 IEC 60898-2 \u0645\u062a\u0637\u0644\u0628\u0627\u062a \u0625\u0636\u0627\u0641\u064a\u0629 \u0644\u0642\u0648\u0627\u0637\u0639 \u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f\/\u0627\u0644\u0645\u0633\u062a\u0645\u0631 \u0623\u062d\u0627\u062f\u064a\u0629 \u0648\u062b\u0646\u0627\u0626\u064a\u0629 \u0627\u0644\u0642\u0637\u0628 \u0627\u0644\u0645\u0624\u0647\u0644\u0629\u060c \u0644\u0643\u0646\u0647 \u0644\u0627 \u064a\u062c\u0639\u0644 \u0643\u0644 \u0642\u0627\u0637\u0639 \u062f\u0648\u0631\u0629 \u0645\u0635\u063a\u0631 (MCB) \u0644\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f \u0645\u0646\u0627\u0633\u0628\u0627\u064b \u0644\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u0633\u062a\u0645\u0631.<\/p>\n

\u0645\u0627 \u0647\u064a \u0627\u0644\u0645\u0639\u0627\u064a\u064a\u0631 \u0627\u0644\u062a\u064a \u064a\u062c\u0628 \u0639\u0644\u0649 \u0645\u0635\u0646\u0639 \u0644\u0648\u062d\u0627\u062a \u0627\u0644\u062a\u0648\u0632\u064a\u0639 \u0645\u0631\u0627\u062c\u0639\u062a\u0647\u0627 \u0639\u0646\u062f \u0637\u0644\u0628 \u0642\u0627\u0637\u0639 \u0627\u0644\u062f\u0627\u0626\u0631\u0629 \u0627\u0644\u0645\u0635\u063a\u0631 (MCB)\u061f<\/h3>\n

\u0627\u0628\u062f\u0623 \u0628\u0642\u0627\u0639\u062f\u0629 \u0627\u0644\u0645\u0639\u064a\u0627\u0631 \u0648\u0627\u0644\u062a\u0631\u0643\u064a\u0628 \u0627\u0644\u0645\u0630\u0643\u0648\u0631\u0629 \u0641\u064a \u0648\u062b\u0627\u0626\u0642 \u0627\u0644\u0645\u0634\u0631\u0648\u0639. \u064a\u063a\u0637\u064a \u0627\u0644\u0645\u0639\u064a\u0627\u0631 IEC 60898-1 \u0642\u0648\u0627\u0637\u0639 \u0627\u0644\u062f\u0627\u0626\u0631\u0629 \u0630\u0627\u062a \u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f \u0644\u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645\u0627\u062a \u0627\u0644\u0645\u0646\u0632\u0644\u064a\u0629 \u0648\u0645\u0627 \u0634\u0627\u0628\u0647\u0647\u0627 \u0636\u0645\u0646 \u0646\u0637\u0627\u0642\u0647\u060c \u0628\u064a\u0646\u0645\u0627 \u064a\u0645\u062b\u0644 \u0627\u0644\u0645\u0639\u064a\u0627\u0631 IEC 60947-2 \u0633\u064a\u0627\u0642\u0627\u064b \u0644\u0645\u0639\u0627\u064a\u064a\u0631 \u0642\u0648\u0627\u0637\u0639 \u0627\u0644\u062f\u0627\u0626\u0631\u0629 \u0645\u0646\u062e\u0641\u0636\u0629 \u0627\u0644\u062c\u0647\u062f \u0644\u0644\u0623\u0634\u062e\u0627\u0635 \u0627\u0644\u0645\u0624\u0647\u0644\u064a\u0646 \u0623\u0648 \u0630\u0648\u064a \u0627\u0644\u062e\u0628\u0631\u0629. \u0648\u062a\u062d\u062f\u062f \u0645\u062a\u0637\u0644\u0628\u0627\u062a \u0627\u0644\u0645\u0634\u0631\u0648\u0639 \u0648\u062b\u0627\u0626\u0642 \u0627\u0644\u0646\u0645\u0648\u0630\u062c \u0627\u0644\u0645\u062e\u062a\u0627\u0631 \u0627\u0644\u0623\u0633\u0627\u0633 \u0627\u0644\u0646\u0647\u0627\u0626\u064a.<\/p>\n

\u0645\u0627 \u0627\u0644\u0630\u064a \u064a\u062c\u0628 \u062a\u0636\u0645\u064a\u0646\u0647 \u0641\u064a \u0637\u0644\u0628 \u0639\u0631\u0636 \u0627\u0644\u0623\u0633\u0639\u0627\u0631 (RFQ) \u0644\u0642\u0648\u0627\u0637\u0639 \u0627\u0644\u062f\u0627\u0626\u0631\u0629 \u0627\u0644\u0645\u0635\u063a\u0631\u0629 (MCB)\u061f<\/h3>\n

\u0642\u0645 \u062a\u0636\u0645\u064a\u0646 \u0627\u0644\u0645\u062e\u0637\u0637 \u0623\u062d\u0627\u062f\u064a \u0627\u0644\u062e\u0637\u060c \u0648\u062a\u0631\u062a\u064a\u0628 \u0627\u0644\u062a\u063a\u0630\u064a\u0629 \u0648\u0627\u0644\u062f\u0627\u0626\u0631\u0629\u060c \u0648\u0627\u0644\u0645\u0648\u0635\u0644\u0627\u062a \u0627\u0644\u0645\u0631\u0627\u062f \u062a\u0628\u062f\u064a\u0644\u0647\u0627\u060c \u0648\u0645\u062a\u0637\u0644\u0628\u0627\u062a \u0627\u0644\u0623\u0642\u0637\u0627\u0628 \u0627\u0644\u0645\u062d\u0645\u064a\u0629\u060c \u0648\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f \u0623\u0648 \u0627\u0644\u0645\u0633\u062a\u0645\u0631\u060c \u0648\u0627\u0644\u0645\u0639\u064a\u0627\u0631 \u0627\u0644\u0645\u0637\u0628\u0642\u060c \u0648\u062f\u0644\u064a\u0644 \u0627\u0644\u0637\u0631\u0627\u0632 \u0627\u0644\u0645\u062d\u062f\u062f \u0627\u0644\u0645\u0637\u0644\u0648\u0628\u060c \u0648\u0642\u064a\u0648\u062f \u0627\u0644\u0644\u0648\u062d\u0629\u060c \u0648\u0623\u064a \u0637\u0644\u0628 \u0644\u0644\u0639\u0644\u0627\u0645\u0629 \u0627\u0644\u062a\u062c\u0627\u0631\u064a\u0629 \u0623\u0648 \u0627\u0644\u062a\u0639\u0628\u0626\u0629 \u0648\u0627\u0644\u062a\u063a\u0644\u064a\u0641.<\/p>\n

\u0645\u062a\u0649 \u0644\u0627 \u064a\u0643\u0648\u0646 \u0647\u0630\u0627 \u0627\u0644\u062f\u0644\u064a\u0644 \u0643\u0627\u0641\u064a\u0627\u064b \u0644\u0644\u0627\u062e\u062a\u064a\u0627\u0631 \u0627\u0644\u0646\u0647\u0627\u0626\u064a\u061f<\/h3>\n

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