{"id":2063,"date":"2026-10-20T19:10:00","date_gmt":"2026-10-20T11:10:00","guid":{"rendered":"https:\/\/lemaele.com\/blog\/switch-supplier-change-notification\/"},"modified":"2026-10-21T18:29:18","modified_gmt":"2026-10-21T10:29:18","slug":"switch-supplier-change-notification","status":"publish","type":"post","link":"https:\/\/lemaele.com\/es\/blog\/switch-supplier-change-notification\/","title":{"rendered":"Notificaci\u00f3n de cambio de proveedor: revisi\u00f3n y recalificaci\u00f3n de una pieza original del fabricante"},"content":{"rendered":"<style>.lema-article{max-width:100%;min-width:0}.lema-article img{max-width:100%;height:auto}.lema-article table{border-collapse:collapse;min-width:580px}.lema-article th,.lema-article td{border:1px solid #ddd;padding:10px;text-align:left;vertical-align:top}<\/style>\n<div class=\"lema-article\">\n<p>A switch supplier change notification should identify what is changing, which part numbers and lots are affected, when the change will occur and what evidence supports continued use. An OEM should assess the effect on its approved assembly before accepting the revised supply. A change that leaves the external dimensions unchanged can still affect materials, contact behavior, manufacturing controls, approvals or traceability. Treat the notification as a controlled engineering decision, not simply an update to a purchasing description.<\/p>\n<p>The <a href=\"https:\/\/lemaele.com\/product\/kw7-series-micro-switch\/\">LEMA KW7 family<\/a> provides a real product reference for organizing model and variant information. This article describes an OEM review process; it does not announce an actual LEMA change, claim a specific notice period or assert that an illustrated specimen represents a revised production lot.<\/p>\n<h2>Establish the approved baseline<\/h2>\n<p>Collect the current order code, controlled drawing, relevant specification, approved sample record and equipment bill of materials. Identify the actuator, contact form, terminal type, rating option and other variant fields that matter to the application.<\/p>\n<p>The baseline should describe the accepted configuration rather than a generic family name. A purchasing system that records only \u201cmicro switch\u201d cannot reliably distinguish variants or determine which equipment is affected by a change. Resolve incomplete records before comparing the proposal.<\/p>\n<p>The <a href=\"https:\/\/lemaele.com\/blog\/oem-custom-micro-switch-rfq-checklist\/\">custom micro-switch RFQ guide<\/a> addresses initial requirement communication. Change review begins later, with an already approved configuration and the obligation to understand the effect of a proposed difference.<\/p>\n<h2>Ask what is changing and why<\/h2>\n<p>The notification should identify the actual change boundary. Examples include a material, contact finish, tooling, manufacturing location, process, subcontractor, test method, marking or packaging. These examples are review categories, not statements that such a change has occurred at LEMA.<\/p>\n<p>Ask for a clear before-and-after description and the reason for the proposal. A statement that quality is \u201cimproved\u201d is not enough to determine whether an equipment test remains representative. Preserve drawings, specification revisions and supporting reports with the notice.<\/p>\n<p>Clarify whether several changes are combined. A new material and a new process may interact, and their evidence should address the resulting configuration. Do not assume that approving one individual difference automatically approves every simultaneous change.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/lemaele.com\/wp-content\/uploads\/2026\/10\/lema-switch-supplier-change-notification-body1-20261021.webp\" alt=\"KW7 roller and plunger specimens on separate trays beside a drawing folder\" title=\"KW7 roller and plunger specimens on separate trays beside a drawing folder\" width=\"1536\" height=\"1024\" loading=\"lazy\"><figcaption>KW7 roller and plunger specimens on separate trays beside a drawing folder. Product-reference illustration; separate objects are not an approved installation or measured test result.<\/figcaption><\/figure>\n<h2>Map the change to the equipment requirements<\/h2>\n<p>Review mechanical fit, actuator movement, force and travel, electrical duty, signal behavior, connections, environmental exposure and service requirements. A difference that seems minor to the supplier can matter to a tight mounting envelope or a low-level input circuit.<\/p>\n<p>Identify the equipment functions that rely on the affected characteristics. A new marking may change inspection or traceability; a terminal change may affect the mating receptacle; an actuator change may affect the target geometry. Record both the physical interface and the operating requirement.<\/p>\n<p>Do not expand a generic review into an unsupported safety approval. If the switch participates in a protective or regulated function, identify the applicable design-control and approval obligations. The responsible engineering and compliance teams must decide what evidence is required.<\/p>\n<h2>Review the supporting test evidence<\/h2>\n<p>Ask which samples and revisions were tested, what methods and acceptance criteria were used, and whether the conditions represent the proposed production configuration. A test report without specimen identity cannot establish which version it supports.<\/p>\n<p>Compare the report&#8217;s conditions with the OEM application. An unloaded mechanical test does not establish electrical endurance under another load. A dimensional check does not prove unchanged contact behavior. Likewise, a supplier&#8217;s general family report may not address the exact variant being changed.<\/p>\n<p>The <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/85002\" rel=\"noopener\" target=\"_blank\">IEC 61058-1 catalogue entry<\/a> identifies general appliance-switch requirements. It does not prove the approval status of a changed part. Obtain the actual current documents and identify whether the proposed change affects any relevant listing or certification scope.<\/p>\n<h2>Decide the scope of requalification<\/h2>\n<p>Use the identified risks and requirements to select the necessary checks. Some proposals may need only document and marking verification, while others require dimensional, interface, environmental, electrical or equipment-level testing. The decision must follow the change&#8217;s effect rather than a fixed checklist copied from an unrelated part.<\/p>\n<p>Record why a check is included or omitted. A narrowly justified test plan is more useful than either automatically repeating every historical test or accepting a statement that nothing important changed. Identify unresolved questions and keep approval conditional until the necessary evidence is available.<\/p>\n<p>Define who can accept the result and how the decision will be recorded. Purchasing, quality, manufacturing and design may each have information, but a purchase-order update should not silently replace an engineering release where one is required.<\/p>\n<h2>Compare old and new samples without losing identity<\/h2>\n<p>Keep the current approved sample and proposed samples clearly separated. Record their order codes, revisions, manufacturing or lot identifiers and the source of each specimen. A visual comparison is useful for external differences but cannot establish unchanged internal construction.<\/p>\n<p>Use controlled photographs and measurements where needed. Do not remove labels or mix samples during handling. If a destructive examination or test is required, define which specimens are used and retain the associated records.<\/p>\n<p>The illustrations in this article show separate specimen trays and blank document folders to explain segregation. They are not certificates, factory records or evidence that two pictured variants are interchangeable. The acceptance decision must come from the actual documents and test results.<\/p>\n<div class=\"lema-table\" style=\"max-width:100%;overflow-x:auto\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Change category<\/th>\n<th scope=\"col\">Question for the OEM<\/th>\n<th scope=\"col\">Evidence to request<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Mechanical or actuator<\/td>\n<td>Does the interface or movement margin change<\/td>\n<td>Revised drawings and relevant assembly checks<\/td>\n<\/tr>\n<tr>\n<td>Contact or electrical<\/td>\n<td>Does approved circuit duty remain supported<\/td>\n<td>Identified specimens methods and test conditions<\/td>\n<\/tr>\n<tr>\n<td>Process or location<\/td>\n<td>Which controls and affected lots differ<\/td>\n<td>Change description process evidence and traceability<\/td>\n<\/tr>\n<tr>\n<td>Marking or documents<\/td>\n<td>Can the approved version still be identified<\/td>\n<td>Controlled revisions and identification examples<\/td>\n<\/tr>\n<tr>\n<td>Production cutover<\/td>\n<td>Which material reaches each equipment build<\/td>\n<td>Agreed effective boundary and release record<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>Plan the effective date and inventory boundary<\/h2>\n<p>Establish the intended change date, first affected lot or other agreed identification method. Determine the status of stock at the supplier, in transit, in the OEM warehouse and already issued to production. Where old and new versions can coexist, define how they will be identified and used. Follow the <a href=\"https:\/\/lemaele.com\/blog\/electromechanical-switch-storage-shelf-life\/\">controlled storage and lot-release guidance<\/a> to keep their condition and identity clear during the transition.<\/p>\n<p>Do not invent a standard notice period. The relevant period depends on the supply agreement and applicable requirements. Record the agreed dates and any conditions for last orders, sample approval or production cutover.<\/p>\n<p>A change-management record should make it possible to trace which version entered which equipment build. The <a href=\"https:\/\/lemaele.com\/blog\/switch-incoming-inspection-lot-acceptance\/\">incoming inspection guide<\/a> covers routine lot acceptance; the change record determines which configuration that lot is expected to contain.<\/p>\n<h2>Keep sampling and qualification distinct<\/h2>\n<p>An incoming sample can help confirm identity and selected characteristics, but it does not automatically qualify a design or process change. The <a href=\"https:\/\/www.itl.nist.gov\/div898\/handbook\/pmc\/section2\/pmc21.htm\" rel=\"noopener\" target=\"_blank\">NIST overview of acceptance sampling<\/a> explains its role in lot decisions. That role is different from demonstrating that a revised configuration meets the equipment requirements.<\/p>\n<p>Use sampling only within the plan that defines its purpose, criteria and response to failure. Do not convert a few visually acceptable samples into a claim that every affected performance characteristic is unchanged.<\/p>\n<p>If evidence is insufficient, keep the proposal open and identify the missing information. Preserve the approved baseline rather than silently combining old test records with new production material and labeling the package complete.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/lemaele.com\/wp-content\/uploads\/2026\/10\/lema-switch-supplier-change-notification-body2-20261021.webp\" alt=\"Three separate KW7 lot specimens with blank tags beside a closed binder\" title=\"Three separate KW7 lot specimens with blank tags beside a closed binder\" width=\"1536\" height=\"1024\" loading=\"lazy\"><figcaption>Three separate KW7 lot specimens with blank tags beside a closed binder. Product-reference illustration; separate objects are not an approved installation or measured test result.<\/figcaption><\/figure>\n<h2>Update the released documents and production controls<\/h2>\n<p>After approval, update the affected drawing references, bill of materials, inspection instructions, approved sample records and supplier information. Identify any new process checks or traceability fields. Ensure that manufacturing and service teams can recognize the accepted version.<\/p>\n<p>Check whether terminal mating parts, mounting hardware or assembly settings also need revision. A switch change can affect another purchased component even when the switch itself has passed its individual tests. Release the complete combination that was actually evaluated.<\/p>\n<p>Keep the approval record linked to the notification and evidence. A later complaint should be traceable to the relevant configuration without relying on an employee&#8217;s memory. Record any limitations, temporary concessions and their expiry or closure conditions.<\/p>\n<h2>Confirm the first production implementation<\/h2>\n<p>Verify that the first received changed material matches the approved proposal and its identification method. Compare documents, markings and agreed inspection characteristics. Escalate unexplained differences instead of assuming they were part of the approval.<\/p>\n<p>Where the plan requires an equipment trial, use the released procedure and record the actual build configuration. Monitor the defined early-production indicators without inventing a success claim from a short observation period. Close the change only when the agreed implementation checks are complete.<\/p>\n<p>Send the full order code, baseline documents and change questions through the <a href=\"https:\/\/lemaele.com\/contact-us\/\">LEMA contact page<\/a>. A clear request asks what changed, what evidence supports it and how affected supply can be identified; it does not rely on a general assurance that the new part is \u201cthe same.\u201d<\/p>\n<h2>Further learning: the limits of acceptance sampling<\/h2>\n<p>NPTEL IIT Kharagpur: Lecture 54: Acceptance Sampling: Key Concepts. This NPTEL lecture explains acceptance sampling. It supports the section distinguishing lot acceptance from change qualification; it does not prescribe a supplier notice period or approve a changed switch design.<\/p>\n<div style=\"position:relative;width:100%;aspect-ratio:16\/9\"><iframe style=\"position:absolute;inset:0;width:100%;height:100%;border:0\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/4H5wdZ3qHZU\" title=\"Lecture 54: Acceptance Sampling: Key Concepts\" loading=\"lazy\" allow=\"accelerometer; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/div>\n<p><a rel=\"noopener\" href=\"https:\/\/www.youtube.com\/watch?v=4H5wdZ3qHZU\" target=\"_blank\">Watch Lecture 54: Acceptance Sampling: Key Concepts<\/a>.<\/p>\n<h2>Frequently asked questions<\/h2>\n<h3>Does unchanged external size mean no requalification is needed?<\/h3>\n<p>No. Internal materials, contact behavior, process controls, markings or approvals may change without an obvious dimensional difference. Map the actual proposal to the equipment requirements and justify the scope of review.<\/p>\n<h3>How many days of notice must every switch supplier give?<\/h3>\n<p>There is no universal period established by this article. Use the supply agreement and applicable requirements, then record the agreed notice, sample, approval and cutover dates for the specific change.<\/p>\n<h3>Can incoming sampling qualify the changed design?<\/h3>\n<p>Sampling supports the lot decision defined by its plan. It does not automatically establish every changed design or process characteristic. Change qualification needs evidence selected for the effect on the approved equipment requirements.<\/p>\n<h3>What should identify the first changed production lot?<\/h3>\n<p>Use the agreed part revision, lot identifier, date or other controlled boundary documented with the supplier. The record should connect received material to equipment builds and distinguish approved old and new configurations.<\/p>\n<\/div>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does unchanged external size mean no requalification is needed?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. Internal materials, contact behavior, process controls, markings or approvals may change without an obvious dimensional difference. Map the actual proposal to the equipment requirements and justify the scope of review.\"}}, {\"@type\": \"Question\", \"name\": \"How many days of notice must every switch supplier give?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"There is no universal period established by this article. 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Compare the baseline, affected requirements, qualification evidence, lot cutover and first production implementation.<\/p>","protected":false},"author":9,"featured_media":2060,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[51],"class_list":["post-2063","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-micro-switch"],"_links":{"self":[{"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/posts\/2063","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/comments?post=2063"}],"version-history":[{"count":1,"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/posts\/2063\/revisions"}],"predecessor-version":[{"id":2064,"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/posts\/2063\/revisions\/2064"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/media\/2060"}],"wp:attachment":[{"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/media?parent=2063"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/categories?post=2063"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lemaele.com\/es\/wp-json\/wp\/v2\/tags?post=2063"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}