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It clarifies NO/NC contact behavior after assembly, the role of dual cam lobes (A top and B bottom), and how to break complex schemes into single-circuit analyses. A worked example for the HAND-OFF-AUTO selector switch shows building an X-O diagram, then using a selection chart to choose the simplest cam and matching 2NO contact blocks.",{"@graph":69,"@context":121},[70,84,104],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/cam-selection-for-pushbutton-selectors-technical-data/665437/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":98,"encodingFormat":97,"isAccessibleForFree":99,"interactionStatistic":100},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/cam-selection-for-pushbutton-selectors-technical-data/665437.png","ImageObject",300,407,{"name":92,"@type":93},"Noah","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29",true,{"@type":101,"interactionType":102,"userInteractionCount":4},"InteractionCounter",{"@type":103},"ViewAction",{"@type":105,"mainEntity":106},"FAQPage",[107,113,117],{"name":108,"@type":109,"acceptedAnswer":110},"Why is a systematic approach needed for selecting pushbutton selector switch components?","Question",{"text":111,"@type":112},"Because selector switches can be configured in complex ways, a clear step-by-step method is required to reliably derive the needed cam and contact block arrangement.","Answer",{"name":114,"@type":109,"acceptedAnswer":115},"How do NO and NC relate to contact behavior in the selector switch?",{"text":116,"@type":112},"NO and NC identify the contact type by its mode before mounting; the provided X-O chart then describes whether the contact closes or opens after assembly for the selected cam shape.",{"name":118,"@type":109,"acceptedAnswer":119},"What is the role of the X-O diagram in cam and contact block selection?",{"text":120,"@type":112},"The X-O diagram determines which contacts should be closed (X) or open (O) in each switch position, then guides choosing the cam and the specific contact block(s) required to implement those functions.","https://schema.org",{"og:url":83,"og:type":123,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":125,"canonical":83},"index,follow",{"doc_id":127,"site_id":62},665437,1793303937,{"code":4,"msg":5,"data":130},{"doc_id":127,"user_id":131,"nickname":92,"user_avatar":132,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":133,"file_id":134,"file_url":135,"file_type":136,"file_size":137,"view_count":4,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":138,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":128,"read_time":41},8796095462418,"https://ap-avatar.wpscdn.com/avatar/80000253c1241d02b47?x-image-process=image/resize,m_fixed,w_180,h_180&k=1778826106357471780","| | |\n| --- | --- |\n| Cam Selection for Pushbutton Selectors\u003Cbr>Technical Data |  |\n\nDecember 2006  \nSupersedes June 1997  \nSelector switches in their varied forms (2-position, 3-position, 4-position androto-push) are a big factor contributing to the great flexibility of control that a well rounded line of “pushbuttons”can achieve.  \nBut because they can be made to perform in such complex and varied ways, they tend to be a little scary to select and apply. This is only because a well thought-out approach is not readily apparent.  \nThe purpose of this article is to provide a time-proven systematic approach that will work in all cases.  \nMany complex selector switch control schemes have been solved using the methods outlined here. Even if you work with it only occasionally, we promise you that you will be able to easily work out the most complex schemes. And have fun doing it.  \nCam and contact block selection is better understood if you:  \n■ Work with each incoming and outgoing wire (each circuit) separately.  \n■ Recognize that the terms NO and NC only identify the type of contact by its mode before mounting to the operator. The “X-O” chart showshow that contact will act after assembly to the operator with the selected cam shape.  \n■ Each cam has two separate lobes, each of which operates one of the two plungers on the contact block independently of each other. Those are identified as position A (top) and position B (bottom) . The position designations give direction in selecting and mounting the contact blocks.  \nSo, the secret of success is a careful, step-by-step analysis of the several elements which make up a complete operating scheme, taking one circuit ata time. Operating schemes which may seem complex at first can be broken down into a series of single circuits which are easy to analyze.  \nAs an exercise, select a switch for oneof the most common applications found in motor control which is the HAND-OFF-AUTO Selector Switch. In this circuit, one incoming line is distributed to two other outgoing circuits by the switch. These two circuits can each be looked at individually.  \nThe first step is to construct on paper, or in your mind, a simple elementary diagram of the switching scheme as follows:  \nIncoming Line  \nHAND  \nOFF  \nAUTO  \nOutgoing Circuit  \nOutgoing Circuit  \nContents  \nDescription Page  \nCam Selection for Pushbutton Selectors Cam Selection ............. 2  \nSummary ................. 2  \nRoto-Push ................. 3  \nContact Block Selection ...... 4  \n3-Position Selector Switch ... 5  \n4-Position Selector Switch ... 6  \n3-Position Roto-Push Switch ... 7  \nGlossary of Terms .......... 9  \nFrom this, you can construct an “X-O”diagram which describes when the contacts are to be closed (X) or open (O) in the various positions of the switch. The “X-O” for the hand circuits looks like this:  \nHAND OFF AUTO  \nX 0 0  \nIn this circuit, you want a contact closed on the left (hand) but none in the center or right.  \nFor the automatic (AUTO) circuit, the“X-O” diagram would look like this:  \nHAND OFF AUTO  \n0 0 X  \nPutting them together, the complete“X-O” diagram is:  \nX O O  \nO O X  \nOnce the “X-O” diagram has been generated, the next step is to select the cam and contact block or blocks needed to perform the desired “X-O”functions. The selection table listed in our Control Products Catalog lists the various types (shapes) of cams by number to choose from and the typeof contact and position to achieve the function outlined in your “X-O”diagram.  \nTechnical Data   \nPage 2 Effective: December 2006  \nCam Selection for Pushbutton Selectors  \nCam Selection  \nThe cam you select determines the operation of all contact blocks mounted to the operator. It is selected on the basis that it provides the simplest circuitry for the desired “X-O” diagram. For this selection we publish a chart in our catalog, and other literature, showing all “X-O” combinations. For the purpose of this discussion, the applicable portion of the chart is show","cbCaicjTMztIZCVe","https://ap.wps.com/l/cbCaicjTMztIZCVe","pdf",319756,12,"English","# Cam Selection for Pushbutton Selectors\n## Cam Selection\n## Contact Block Selection\n## Selector Switch Operator\n## Summary\n## Roto-Push\n## 3-Position Selector Switch\n## 4-Position Selector Switch\n## 3-Position Roto-Push Switch\n## Glossary of Terms","[{\"question\":\"Why is a systematic approach needed for selecting pushbutton selector switch components?\",\"answer\":\"Because selector switches can be configured in complex ways, a clear step-by-step method is required to reliably derive the needed cam and contact block arrangement.\"},{\"question\":\"How do NO and NC relate to contact behavior in the selector switch?\",\"answer\":\"NO and NC identify the contact type by its mode before mounting; the provided X-O chart then describes whether the contact closes or opens after assembly for the selected cam shape.\"},{\"question\":\"What is the role of the X-O diagram in cam and contact block selection?\",\"answer\":\"The X-O diagram determines which contacts should be closed (X) or open (O) in each switch position, then guides choosing the cam and the specific contact block(s) required to implement those functions.\"}]","Cam Selection for Pushbutton Selectors - Technical Data | PDF"]