[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-640803-105":59,"doc-detail-640803-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","gek-34053-time-overcurrent-relays","GEK-34053 - Time Overcurrent Relays","","Manual for GE General Electric Type IAC51 and IAC52 single-phase, current-operated AC time overcurrent relays with inverse time/current characteristics. Covers functional description of the time-overcurrent induction-disk unit plus dual-rated target/seal-in unit and optional instantaneous-overcurrent unit, along with mounting case information and the distinctions among IAC51A, IAC51B, IAC52A, and IAC52B. Includes application guidance for multi-phase, phase-to-ground, overload backup, typical external connections, reset-time considerations for automatic reclosers, and coordination timing ranges for downstream coordination.",{"@graph":69,"@context":122},[70,84,105],{"@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/gek-34053-time-overcurrent-relays/640803/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/gek-34053-time-overcurrent-relays/640803.png","ImageObject",300,407,{"name":92,"@type":93},"Alexandar","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-26","2026-10-22",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What are the IAC51 and IAC52 relays used to protect against?","Question",{"text":112,"@type":113},"They protect commercial, industrial, and utility power distribution systems against multi-phase faults and phase-to-ground faults. They are also used for overload backup protection in many cases.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What components make up each relay?",{"text":117,"@type":113},"Each relay includes a basic induction-disk time-overcurrent unit and a dual-rated target/seal-in unit. Some models may also include a hinge-type instantaneous overcurrent unit.",{"name":119,"@type":110,"acceptedAnswer":120},"How should reset time and coordination time be considered when using these relays with automatic reclosers or downstream relays?",{"text":121,"@type":113},"The reset time is approximately seven seconds (7 s) when set at number 10 on the time dial. Coordination time with downstream relays is generally 0.25 to 0.40 s, including breaker clearing time plus relay overtravel and safety factor.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},640803,1793034998,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},962090768658,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","# INSTRUCTIONS\n\nTIME OVERCURRENT RELAYS  \nTYPES  \nIAC51AFORM 800 AND UPIAC51B FORM 800 AND UPIAC52AFORM 800 AND UPIAC52B FORM 800 AND UP  \nGENERAL ELECTRIC  \nGEK-34053  \nTABLE OF CONTENTS  \nDESCRIPTION . .  \nAPPLICATION ..  \nCONSTRUCTION ..  \n . …………  \nE-OVERCURRENT UNIT ………………………………  \nTARGET AND SEAL-IN UNIT .. ………………………………  \nTACTS……………………………UVT…………LL费  \nBURDENS .·... …………………………………  \nCHARACTERISTICS …………………………………………………………………………………  \nRECEIVING,HANDLING,AND STORAGE …………………………  \nACCEPTANCE TESTS ……………………………………………………………………  \nVISUALVISUAL  INSPECTIONINSPECTION ……………………………………………………………… ………………………………………………  \nMECHANICAL INSPECTION ………………………………………………  \nELECTRICAL TESTS ………………………………………………………………  \nDRAWOUT RELAYS,GENERAL ………………………………  \nPOWER REQUIREMENTS,GENERAL ……………………  \nTIME-OVERCURRENT UNIT ……………………………………  \nTIME SETTING …………………………………………………………  \nPICKUP TEST …………………………………………………………  \nTIME TEST . ………………………………………………………………  \nINSTANTANEOUS UNIT ………………………………………………  \nSETTING THE INSTANTANEOUS UNIT ..  \nPICKUP TEST .· ……………………………………………………  \nTARGET AND SEAL-IN UNIT …………………………………  \nPICKUP AND DROPOUT TEST …………………………  \nINSTALLATION . ...... …………………………………………  \nTIME-OVERCURRENT UNIT ………………………………………………  \nTARGET AND SEAL-IN UNIT …………………………………………  \nINSTANTANEOUS UNIT …………………………………………………………  \nPERIODIC CHECKS AND ROUTINE MAINTENANCE . ..  \nTIME OVERCURRENT UNIT ……………………………………………………  \nINSTANTANEOUS UNIT .... ………………………………  \nTARGET AND SEAL-IN UNIT …………………………………………  \nCONTACT CLEANING ..... ………………………………  \nSYSTEM TEST ... .... ……………………………………  \nSERVICING . · . …………………………………………………………………………………  \nTIME-OVERCURRENT UNIT ………………………………………………  \nPICKUP TESTS .... …………………………………………  \nTIME TESTS ……………………………………………………………………………  \nINSTANTANEOUS UNIT …………………………………………………………  \nTARGET AND SEAL-IN UNIT …………………………………………  \nRENEWAL PARTS ..... .. ……………………………………………  \nLIST OF FIGURES ……………………………………………………………………………  \n·  \n●章·  \n·  \n费  \n...........  \n8  \n9  \n9  \n9  \n13  \nGEK-34053  \nTIME OVERCURRENT RELAYS  \n## DESCRIPTION\n\nThe Type IAC51 and IAC52 relays are single-phase,  current-operated,AC devices with inverse time/current characteristics.  Theyare utilized to protect commercial,industrial,  and utility powerdistribution systems against either multi-phase or phase-to-groundfaults.  \nEach relay consists of a basic induction-disk time-overcurrentunit,and a dual-rated target/seal-in unit,and may include a hinge-type instantaneous-overcurrent unit.   Both the time-overcurrent unitand the instantaneous unit are adjustable over a range of about 8 to  \n1.   The available ranges in amperes of both units,as well asinformation on their continuous rating,  contact rating,  andtarget/seal-in unit tap ratings are given in the section on RATINGS.  \nA standard Sl case is used to mount each relay.  The outline andmounting dimensions of this case are shown in Figure 12.  \nThe basic differences between the relays covered by theseinstructions are noted in the following table:  \n\n| TYPE   | INSTANTANEOUS  \u003Cbr>UNIT   | CONTACT  \u003Cbr>CIRCUIT   | INTERNAL  \u003Cbr>CONNECTIONS   |\n| --- | --- | --- | --- |\n| IAC51A   | NO   | 1   | FIGURE 4   |\n| IAC51B   | YES   | 1   | FIGURE 5   |\n| IAC52A   | NO   | 2   | FIGURE 6   |\n| IAC52B   | YES   | 2   | FIGURE 7   |\n\n\n| These instructions do not purport to cover all details or variations in equipment nor provide for every  \u003Cbr>possible contingency to be met in connection with installation,operation or maintenance.Should further  \u003Cbr>information be desired or should particular problems arise which are not covered sufficiently for the purchaser's  \u003Cbr>purposes,the matter should be referred to the General Electric Company.  \u003Cbr>To the extent required the products described herein meet applicable ANSI,IEEE and NEMA  \u003Cbr>standards;but no such assurance is given with respect to local codes and ordinances because they varygreatly.   |\n| --- |\n\nGEK-34053  \nAPPLICATION  \nThe inverse time-current characteristics make the IAC51 and IAC52relays well suited for multi-phase and phase","cbCaif9fvDWkoE8A","https://ap.wps.com/l/cbCaif9fvDWkoE8A","pdf",9739262,34,"English","# DESCRIPTION\n# APPLICATION\n# CONSTRUCTION\n# E-OVERCURRENT UNIT\n# TARGET AND SEAL-IN UNIT\n# TACTS\n# BURDENS\n# CHARACTERISTICS\n# RECEIVING, HANDLING, AND STORAGE\n# ACCEPTANCE TESTS\n# VISUAL INSPECTION\n# MECHANICAL INSPECTION\n# ELECTRICAL TESTS","[{\"question\":\"What are the IAC51 and IAC52 relays used to protect against?\",\"answer\":\"They protect commercial, industrial, and utility power distribution systems against multi-phase faults and phase-to-ground faults. They are also used for overload backup protection in many cases.\"},{\"question\":\"What components make up each relay?\",\"answer\":\"Each relay includes a basic induction-disk time-overcurrent unit and a dual-rated target/seal-in unit. Some models may also include a hinge-type instantaneous overcurrent unit.\"},{\"question\":\"How should reset time and coordination time be considered when using these relays with automatic reclosers or downstream relays?\",\"answer\":\"The reset time is approximately seven seconds (7 s) when set at number 10 on the time dial. Coordination time with downstream relays is generally 0.25 to 0.40 s, including breaker clearing time plus relay overtravel and safety factor.\"}]","GEK-34053 - Time Overcurrent Relays | PDF",1792711620,86]