RELAYS Panasonic

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Panasonic is part of a large worldwide groupselling relays and associated switching products under different brand names in different territories.The conditions of use in some territories may differ from those customary in Europe. In particular there are often major differences in regard to national and international specifications, such as UL, CSA, VDE, SEV, EVE, SEMKO, etc. Thus, when considering contact loads as stated in this catalogue (e.g. 10 A, 30 VDC for the SP relay) its hould be understood that these values are not necessarily an absolute maximum but tested ratings. Mostly the stated value has been tested for a certain life expectancy as stated by the manufacturer or the respective test house. Thus, under different conditions, the stated “maximum” may, in practice, be safely exceeded.

Vydal: Panasonic Electric Works Czech s.r.o. Autor: Panasonic

Strana 823 z 1090

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Poznámky redaktora
Relativelyeasytoimplementgoldplatinginexistingrelays. Contact Protection • Counter EMF W itc tiv ith a D irc its , D C s rta to a ith to p . . AgSnO2 (silver-tin) ExhibitssuperiorweldingresistancecharacteristicsequalorbetterthanAgCdO. C tio irc its t m ria ria tra r s d as lly a c tio e c tio rs on itiv s (s f ds_x61_en_relay_technical_information_091112D 621 ON OFF i dle ttl TechnicalInfo.Expensive.5pm Purposeistoprotectthecontactbasemetalduringstorageoftheswitchordevicewithbuilt-inswitch.Careis requiredatlowvoltageandlowcurrentlevels. 2. Contact Material AgW (silver-tungsten) Hardnessandmeltingpointarehigh,arcresistanceisexcellent,anditishighlyresistanttomaterialtransfer. M lic in th ly p lim t th itc t g lia ility o itc g fre itio in th ire e a ith A d c tro r th ire (fo ­ m ire lic tio tc.Goldcladisusedtopreventpolymerbuildup. AgPd (silver-palladium) Atstandardtemperature,goodcorrosionresistanceandgoodsulfidationresistance. f p lin d re . However,highcontactpressureisrequired.Dependingontheplatingprocessused,supervisionisimportantasthereisthe possibilityofpinholesandcracks.1to0. rre e lo tiv r less, ill e ig itio e d tte r c k d its on th t fa ilu . W tiv itc d off, to s lts h ca d g tly rte life. • Material transfer phenomenon M ria tra n o lts ils t m ria tra s th itc tio s in rfa s d re 1 fte ile ts lo is o fte irc its re p ts “ rre is la tiv itiv s o rre e (s f a ). Likesilver,iteasilydevelopsasulfidefilminasulfideatmosphere.Specialcharacteristicsare uniformthicknessandthenonexistenceofpinholes. AgNi (silver-nickel) Equalstheelectricalconductivityofsilver.However,indrycircuits, organicgasesadhereanditeasilydevelopsapolymer. Auplating (goldplating) SimilareffecttoAuclad. is d ira so th less. Peak voltage meter ^ Several hundred to several thousand volts (a) (b) Figure Example counter emf and actual measurement In i/ d ith d a ith rity in F tiv e lo itc off.Asplatedcontacts,usedforrelativelylightloads.). 3.Exhibitslowcontactresistance,is inexpensiveandwidelyused.Adisadvantageisiteasilydevelopsasulfidefilminasulfideatmosphere.).General Application Guidelines lim ite tiv a b f re rily f c rre ity C c irc its . Surface Finish Auclad (goldclad) Auwithitsexcellentcorrosionresistanceispressureweldedontoabasemetal.Oftendifficulttoimplementcladcontactsinexistingrelaysduetodesignandinstallation.However, acertaindegreeofcontactstabilitycanbeobtainedevenwhenswitchingloads.Furthermore,contactresistanceisrelativelyhighandresistanceto corrosionispoor.Excellentarcresistance.Greatlyeffectiveespeciallyforlowlevelloadsunderrelatively adverseatmospheres. Characteristics Common Contact Materials C ris tic ria re g n s tin y. Rhplating (rhodium) Combinesperfectcorrosionresistanceandhardness. Ag (silver) Electricalconductivityandthermalconductivityarethehighestofallmetals. G lly ritic tric b lta rd te t 2 lts r e e c i2) s il. • Current T rre d o tim irc rts im rta flu n th ith e e rre tim f c irc it, , a tra r in d c tra tio n im .Therefore,itisusedinhermeticsealed relays(reedrelays,etc.Expensive. Auflashplating (goldthin-filmplating) 0.Also,thereareconstraintsonprocessingandmountingtocontactsprings.Inan organicgasatmosphere,careisrequiredaspolymersmaydevelop