This guide has been prepared to aid the circuit and system
\ndesigner in the selection of supplemental fuses. Traditionally,
\nthese have been fuses that interrupt the primary equipment power
\nsource when an overcurrent condition develops in a device or
\nproduct. This guide will cover only fuses intended for electronic
\napplications.<\/p>\n
Introduction<\/strong><\/p>\n Fuses that are covered in this Application Guide Fuses are quite complex despite their simple appearance. Each Careful investigation by the design engineer must be carried out Typically, an engineer designs a circuit to meet specified Design parameter considerations to be \u2022\u00a0safety agency approvals;<\/p>\n \u2022\u00a0open circuit voltage;<\/p>\n \u2022\u00a0short circuit current potentially available (Interrupting \u2022\u00a0steady state circuit current;<\/p>\n \u2022\u00a0space limitation;<\/p>\n \u2022\u00a0worst case current inrush or current spikes (peak \u2022\u00a0maximum permitted voltage drop across the fuse at the \u2022\u00a0mounting method (clips, soldered leads, holders, surface \u2022\u00a0plating compatibility with clips, holders and solder;<\/p>\n \u2022\u00a0environmental issues: temperature, humidity, shock & \u2022\u00a0I2<\/sup>t limitations;<\/p>\n \u2022\u00a0processing requirements (wave solder, IR reflow, aqueous \u2022\u00a0open circuit indication (local and\/or remote);<\/p>\n \u2022\u00a0RoHS compliance;<\/p>\n These are only a few of the preliminary considerations before After a specific fuse is selected, the next step is to determine The Application Guide<\/i> that follows will help in User\u2019s Application Guide to Fuses<\/b><\/p>\n
\ntypically<\/i> range in physical size up to 10.4 X 40 mm. These
\nfuses fall within the ANCE-248 (Mexico)\/CSA C22.2, 248 \/ UL 248,
\nSupplemental Fuse Standard for North American
\napplications.<\/i> Current ratings covered by this Standard range
\nfrom milliamperes to as high as 60 amperes, with voltage ratings up
\nto 600 volts AC or DC. These devices are available in a variety of
\nmounting schemes including plug-in, cartridge, through-hole and
\nsurface mount.<\/p>\n
\nfuse type and current rating will have unique operating
\ncharacteristics, maximum operating limits and internal
\nconstruction. Subtle variations between manufacturers' designs will
\naffect equivalency even between two seemingly identical devices.
\nFurther, any given type of fuse from a single manufacturer will
\nhave electrical and mechanical parameter variations that result
\nfrom slight production variations during processing within a given
\nlot and from lot to lot. Safety agency approvals, e.g., ANCE, CSA,
\nand UL, are related to parameters for fuses employed in worst case
\napplications. EIA will set minimum, non-safety related,
\nrequirements for fuses that will not serve to diminish minimum
\nrequirements set by the safety agencies. These will be comprised of
\nadditional requirements not associated with safety-related
\nparameters. The goal of EIA is to standardize qualification
\nperformance and characteristics of equivalent fuses, manufactured
\nby multiple sources in an effort to accommodate
\ninterchangeability.<\/p>\n
\nto determine what type of fuse is best for a given application. It
\nmay be beneficial to use both a fuse and some other device to
\nprovide more complete circuit or component protection.<\/p>\n
\nrequirements. During the design phase it is important to consider
\ncircuit protection needs. The engineer should always assume that
\nsome type of circuit protection will be required. The fuse may
\nultimately be determined to be unnecessary, resulting in cost
\nsavings. However, the proper spacing will have been made available
\nto safely accommodate the fuse, if it is required, and the product
\ndevelopment can proceed on schedule within the initially budgeted
\ncosts.<\/p>\n
\naddressed<\/strong><\/p>\n
\ncurrent rating)<\/p>\n
\ncurrent, time duration and multiple event time intervals must be
\nanticipated);<\/p>\n
\nstandard steady state circuit current;<\/p>\n
\nmount, etc.);<\/p>\n
\nvibration exposure (during production, during storage, during
\ntransportation and in field operation);<\/p>\n
\ndetergent cleaning);<\/p>\n
\nbeginning circuit design.<\/p>\n
\nif the choice was the proper one. Fuses are somewhat unique in the
\nrealm of electronic components; if they function properly during
\nstress testing, they are either weakened or made inoperable.
\nNondestructive test results, as well as tight production control,
\nmust be used to predict whether or not a given fuse will continue
\nto perform as desired in a given application. This usually requires
\nsignificant testing of a given fuse in the final product. Testing
\nin the actual application is essential in many cases even though it
\nis both a time consuming and costly part of the development
\nprocess. A critical task, often left unfinished when any fuse is
\nfinally selected, is adhering to approved parameters. This should
\nbe done using a specification that sets limits on critical
\nelectrical and mechanical properties.<\/p>\n
\navoiding the pitfalls associated with erroneous fuse selection and
\nsizing parameters. If problems should arise that have not been
\ncovered in this Application<\/i> Guide<\/i>, (fuseholder
\nselection), the fuse manufacturers are available to assist in the
\nselection and optimization process.<\/p>\n","protected":false},"excerpt":{"rendered":"\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ECIA<\/b><\/a><\/td>\n 2008<\/td>\n 18<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":556599,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2649],"product_tag":[],"class_list":{"0":"post-556592","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-ecia","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/556592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/556599"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=556592"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=556592"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=556592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}