{"id":3568,"date":"2026-08-12T11:00:00","date_gmt":"2026-08-12T11:00:00","guid":{"rendered":"https:\/\/chac-electric.com\/?p=3568"},"modified":"2026-08-12T11:51:37","modified_gmt":"2026-08-12T11:51:37","slug":"mccb-frame-size-rated-current-rfq","status":"publish","type":"post","link":"https:\/\/chac-electric.com\/pt\/blog\/mccb-frame-size-rated-current-rfq\/","title":{"rendered":"What Should an MCCB RFQ Separate Before a Quote?"},"content":{"rendered":"<div class=\"b2b-article\">\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>MCCB frame size is not a substitute for the rated-current and circuit information required for a quote.<\/strong> A reliable RFQ keeps the drawing, circuit role, pole count, system voltage, requested rating information, and selected-model documents together before a supplier response is compared.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"CHAC CQM6 MCCB used to introduce frame-size and rated-current RFQ checks\" src=\"https:\/\/chac-electric.com\/wp-content\/uploads\/2026\/08\/mccb-frame-size-rated-current-rfq-overview.webp\" \/><\/figure>\n<nav class=\"b2b-toc\" style=\"background:#f5f8fa;padding:16px 20px;border-radius:8px;margin:0 0 24px\">\n<h2 id=\"contents\" style=\"margin:42px 0 14px;scroll-margin-top:96px\">Conte\u00fados<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"#part-1-separate-the-frame-reference-from-the-circuit-requirement\">Part 1. Separate the frame reference from the circuit requirement<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-2-what-rated-current-adds-to-an-mccb-review\">Part 2. What rated current adds to an MCCB review<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-3-compare-the-data-behind-a-frame-and-rating-request\">Part 3. Compare the data behind a frame and rating request<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-4-place-the-drawing-details-beside-the-quotation-fields\">Part 4. Place the drawing details beside the quotation fields<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-5-ask-suppliers-for-a-comparable-mccb-response\">Part 5. Ask suppliers for a comparable MCCB response<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-6-use-the-chac-mccb-route-after-the-rfq-is-complete\">Part 6. Use the CHAC MCCB route after the RFQ is complete<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-7-keep-frame-and-rating-review-inside-its-fit-boundary\">Part 7. Keep frame-and-rating review inside its fit boundary<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-1-separate-the-frame-reference-from-the-circuit-requirement\">Part 1. Separate the frame reference from the circuit requirement<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">An MCCB frame reference helps identify a product family or physical range. It does not, by itself, state the rated current needed for a specific circuit or prove that the proposed breaker meets the project requirement. Treat the frame and rating as distinct fields in the drawing and the RFQ.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">The panel record should make the circuit role clear first. Then add the current requirement, poles, system voltage, and selected-device documentation required for a technically comparable quotation. That sequence keeps a family label from being mistaken for a completed selection.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-2-what-rated-current-adds-to-an-mccb-review\">Part 2. What rated current adds to an MCCB review<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Rated current is one of the fields that connects the breaker request to the circuit requirement. It must be reviewed with the selected model, circuit role, pole count, system voltage, applicable project requirements, and the product documentation requested for the quote.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Frame size and rated current can appear close together in a catalogue, but they answer different questions in an RFQ. A supplier needs enough circuit information to state what model is being proposed and what evidence supports the proposal; a buyer needs the same information to compare responses fairly.<\/p>\n<blockquote>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>Importante:<\/strong> Do not approve an MCCB from a frame label, enclosure appearance, or a generic family range. Confirm the circuit requirement and selected-model documents before the breaker is placed on the final BOM. (<a href=\"https:\/\/webstore.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">IEC switchgear and controlgear document catalog<\/a> \u2014 selected-device record context)<\/p>\n<\/blockquote>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-3-compare-the-data-behind-a-frame-and-rating-request\">Part 3. Compare the data behind a frame and rating request<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">The most useful comparison table distinguishes what each field contributes to the review. It does not calculate a rating or confirm coordination for a project.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Review field<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">What it identifies<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">What still requires confirmation<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Frame reference<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Product-family or frame information being requested<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Exact proposed model and its documented scope<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Rated current requirement<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Circuit field to be matched in the quote<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Suitability with the circuit and project requirements<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Pole count<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Device arrangement to compare with the drawing<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Selected-model pole information<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">System voltage<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Electrical context stated by the panel record<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Published model fields and project conditions<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Fun\u00e7\u00e3o do circuito<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Why the breaker is being considered<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Protection study and final engineering decision<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"CQM6 MCCB detail for reviewing frame-size and rated-current quotation evidence\" src=\"https:\/\/chac-electric.com\/wp-content\/uploads\/2026\/08\/mccb-frame-size-rated-current-rfq-review.webp\" \/><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7\">Comparing quotations on these fields prevents a simple frame reference from hiding missing information. Ask each supplier to identify the proposed model and the source documents used to compare its stated fields with the RFQ.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-4-place-the-drawing-details-beside-the-quotation-fields\">Part 4. Place the drawing details beside the quotation fields<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">The drawing revision is the shared record that shows the circuit role and makes the requested rating meaningful. Add the required current, pole count, system voltage, installation context, and requested technical documents next to the frame reference rather than scattering them between a BOM and emails.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Evidence to provide<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Why it matters to the quote<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Response to compare<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Current drawing and revision<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Identifies the circuit role and scope<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Proposed model tied to the same drawing<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Frame reference and current requirement<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Separates family reference from requested circuit field<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Model identification and published rating evidence<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Pole count and system voltage<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Defines fields to review with the circuit<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Selected-model product documentation<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Contexto de instala\u00e7\u00e3o<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Flags conditions needing confirmation<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Stated limits and installation information<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Evidence request<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Makes technical returns comparable<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Requested document pack for the proposal<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">For a trip-approach question, use the related <a href=\"https:\/\/chac-electric.com\/pt\/blogue\/thermal-magnetic-vs-electronic-mccb-selection\/\">thermal-magnetic versus electronic MCCB selection article<\/a>. For a broader procurement perspective, the <a href=\"https:\/\/chac-electric.com\/pt\/blogue\/mccb-buying-guide-oem-distributor-buyers\/\">MCCB buying guide for OEM and distributor buyers<\/a> provides related context without replacing the frame-and-rating review.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-5-ask-suppliers-for-a-comparable-mccb-response\">Part 5. Ask suppliers for a comparable MCCB response<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">An RFQ should request a response that can be checked line by line. Name the proposed model, ask for the selected-model record, and keep the buyer&#8217;s circuit fields visible in the same request. This is more useful than requesting \u201can MCCB of this frame\u201d without describing the rating or circuit evidence.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Include with the RFQ<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">What it resolves<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Supplier response to ask for<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Panel drawing and circuit role<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Why the breaker is being quoted<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Proposed model identified to the drawing<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Frame reference and current requirement<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Separate fields that must not be collapsed<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Published selected-model fields<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Pole count and system voltage<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Device and supply information to review<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Model-specific documentation<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Contexto de instala\u00e7\u00e3o<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Conditions that require confirmation<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Stated limits and applicable records<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Required evidence pack<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">A comparable technical return<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Product identification and requested documents<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">Utilize o <a href=\"https:\/\/chac-electric.com\/pt\/mccb\/\">MCCB category<\/a> as the upward product-family context, and keep the <a href=\"https:\/\/chac-electric.com\/pt\/electrical-distribution-equipment\/\">electrical distribution equipment range<\/a> available for related component navigation. Feeder-scope decisions stay separate, as explained in the <a href=\"https:\/\/chac-electric.com\/pt\/blogue\/acb-vs-mccb-feeder-protection-scope\/\">ACB versus MCCB feeder protection scope article<\/a>.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-6-use-the-chac-mccb-route-after-the-rfq-is-complete\">Part 6. Use the CHAC MCCB route after the RFQ is complete<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">O <a href=\"https:\/\/chac-electric.com\/pt\/product\/cqm6-standard-molded-case-circuit-breaker-mccb-oem-manufacturer\/\">CQM6 MCCB product route<\/a> publicly lists 10A\u20131250A, 2P\/3P\/4P, 400\/415V AC, and IEC\/EN 60947-series references. Use these published fields as a first-party route for selected-model discussion after the RFQ has described the circuit evidence; they do not provide a frame-sizing calculation or establish project suitability.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"CHAC CQM6 MCCB product route for a documented frame-size and rated-current RFQ\" src=\"https:\/\/chac-electric.com\/wp-content\/uploads\/2026\/08\/mccb-frame-size-rated-current-rfq-product.webp\" \/><\/figure>\n<h3 style=\"margin:28px 0 12px\">Recomenda\u00e7\u00e3o de produto<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Use this CQM6 MCCB product route when the RFQ has separated the frame reference from the current requirement and requested the supporting records. Do not substitute an image-only or generic family match: appearance cannot establish the required rating, poles, voltage, trip information, or project fit. OEM or documentation requirements can be raised through the <a href=\"https:\/\/chac-electric.com\/pt\/personalizacao-da-distribuicao-de-energia\/\">power-distribution customization page<\/a>.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-7-keep-frame-and-rating-review-inside-its-fit-boundary\">Part 7. Keep frame-and-rating review inside its fit boundary<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">This article supports early RFQ preparation and supplier-document comparison. It is not field-installation guidance, a final breaker-setting instruction, a short-circuit or coordination study, local rule interpretation, or an approval of a specific MCCB for a named project.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Fit Boundary: retain final MCCB selection with the approved drawing, circuit requirements, selected-model documents, applicable project requirements, and qualified engineering review. Send the RFQ evidence and document request to <a href=\"https:\/\/chac-electric.com\/pt\/contacte-nos\/\">CHAC El\u00e9trico<\/a> when requesting a product route.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"faqs\">FAQs<\/h2>\n<h3 style=\"margin:28px 0 12px\">What is MCCB frame size?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Frame size is a product-family or frame reference used in a breaker review. It must be read with the selected-model documentation and the circuit information in the RFQ.<\/p>\n<h3 style=\"margin:28px 0 12px\">Is frame size the same as rated current?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">No. Rated current is a separate circuit-related field that must be stated and reviewed rather than inferred from a frame reference alone.<\/p>\n<h3 style=\"margin:28px 0 12px\">Can an MCCB be selected from frame size alone?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">No. The circuit role, required current, pole count, system voltage, project conditions, and selected-model evidence also need review.<\/p>\n<h3 style=\"margin:28px 0 12px\">What data should be given for an MCCB quotation?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Provide the current drawing revision, circuit role, frame reference, current requirement, poles, system voltage, installation context, and the documents required for the proposed model.<\/p>\n<h3 style=\"margin:28px 0 12px\">Do pole count and system voltage matter in an MCCB RFQ?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Yes. They are fields that connect the requested breaker route to the panel record and should be returned with selected-model documentation.<\/p>\n<h3 style=\"margin:28px 0 12px\">Who confirms final MCCB suitability?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">The responsible project engineering review should confirm final suitability using the approved drawing, applicable requirements, and selected-model documentation.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"references\">Refer\u00eancias<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/webstore.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">IEC switchgear and controlgear document catalog<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/www.iec.ch\/standardsdev\" rel=\"nofollow noopener\" target=\"_blank\">IEC standards-system development overview<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/www.eaton.com\/us\/en-us\/products\/electrical-circuit-protection.html\" rel=\"nofollow noopener\" target=\"_blank\">Eaton electrical protection product-resource center<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/www.se.com\/ww\/en\/work\/products\/electrical-distribution\/\" rel=\"nofollow noopener\" target=\"_blank\">Schneider Electric low-voltage distribution resources<\/a><\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>MCCB frame size is not a substitute for the rated-current and circuit information required for a quote. A reliable RFQ keeps the drawing, circuit role, pole count, system voltage, requested rating information, and selected-model documents together before a supplier response is compared. Contents Part 1. Separate the frame reference from the circuit requirement Part 2. [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":3564,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3568","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":7}},"acf":[],"_links":{"self":[{"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/posts\/3568","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/comments?post=3568"}],"version-history":[{"count":1,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/posts\/3568\/revisions"}],"predecessor-version":[{"id":3569,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/posts\/3568\/revisions\/3569"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/media\/3564"}],"wp:attachment":[{"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/media?parent=3568"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/categories?post=3568"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chac-electric.com\/pt\/wp-json\/wp\/v2\/tags?post=3568"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}