FEAT RE FEA ATURE


SWIIT


TCHES & R


S & RELAYS


YS


KEY CONSIDERATIONS WHEN f


KEY CONSIDERATIONS WHEN speci ying switch and relay designs


Andries de Bruin, Se ct innova


latest co latest contact


Andries deBruin, Senior European ProductM rketi g M nager at Omron Electronics discusses the vances inswtchandrelaydesignandhow ths is im ctin


t in ov tiovationadva


Senior European Product MarketingManager atOmron Electronics discusses the in


in swiitch rela sig ica io


ideal forhighdensitymounting andit is 20mmlong and12.5mmhigh.


, lighting, ro


stillhigher currents.Aparticular problemas current incre


re


continues to flow switchstart


ross the ga


normally verybrief, it cansignificantly reduce contact life. It is arc 100,000or so opera


rts to open.Althougharcing is re


rcing that limits re relay life to rations–mechanically, the


component canwithstandmillions o f switching opera


during closing canpro contact structure


rdG5Qre ratedfor 100,000opera


rations.Contact ‘bounce’when rolong arcing.Anew


has delivereveredfour times the endura standard


The redesignedcontacts suppre reducing arc


Forhighinrushcurre W


component market Core products serving traditional applications such as automotive, communications, white goods and industrial markets continue to do well. New classes of components are becoming integral to new markets driven by the need to reduce energy


e are benefitting from a ‘double peak’ in the electromechanical .


consumption through the installation of smart meters, the use of renewable sources and the introduction of hybrid vehicles.


or a quart simple, the shape, layo contacts, andthematerial fro


At the centre of any relay or switchis apai r rtet of contacts.Thoughapparently yout anddesignof these romwhichthey are


sw


made, is fundamental to its p rferformance, curre


renthandling capability andsize. SW C


goodcontact is alwaysmade, andhaving a sliding actionas the contactsmeetnot only helps re ov but also re


that go


remove dust andother contaminants reducesnoise.New


roke


for consumer electronics,highgrade automotive


ve,white go security systems andsmart 32 32 SEP EMBER 201


switches fromOmron, theD2AW, use exactly this designgiving thehighre


reliability required ra


re


goods, VAHVACsystems, rtmeters.


SEPTEMBER 2016 | ELEC RO ELECTRONICS CS


ewlong stroke sealed AW


SWITCHCONT CT SWITCH CONTANTAC DESIGN ACT DESIGN Issues that causeunreliability insw


contacts.Doubling the conta include dust andother conta


switches


minants onthe ctshelps ensure


beenactuated Insome cases ahighoperating force is desira


Inother applications, it is desirable tohave a reassuring ‘click’ to indicate that the sw .


, rable t preo revent unintended


ke elevator switches, circuit breakers, digital pens andlaser pointers, these characteristics needtobe accompaniedby a long serv OmronD2LS switcheswithsilve


rc ver cro ve


standard feature ff


RELAY


rations perminute andare avare vailablewith rd(0.6N) andhighforce (1.2N).Both re the same long life andfast switc andoffer a clear click during switching.


millionoperations, canswitchat 300 opera


rc “Arcing “A


relays usedinindustrial control and building automationsystems, space is at apre


RELA CONTACT For re


remiumbut curre


consumptionOmro reduce


ressure to re ro r rents canbe as


highas 5A. Tohelpcustomers under pre


size andpow rc kel andgoldplated


onhas developeda ower


newcross bar twincontact architecture withsilvernicke


reation re


contacts.Thishas enabledthe cre theG6DN. It isnot only the smallest de its specificationonthemarke the low


ket, but also owest coil pow


110mW.Thismake require


in ower consumption–ju res only am imal amount of energy


kes it extremely efficient, as it gy to


switchthe relay. It’swidthis 5mm,making it


Omron Electronics www.omron.co.uk T: 01908 258258


www.omron.co.uk / ELECTRONICS ELECTRONICS


s o


AY CONTAC CHAL ENGES ACT CHALLENGES “Arci limits relay life toay life to lim ts rela fe


100,100,000 or so operations – mechanically,


switchin . C


can w thstand m llions of switching operations. Contact ‘bounce’when during closing can prolong arcing ....”


000 or so operat ons – chani al y,ly the component canwithstandmillions of io


‘bounce’ w en during closi can prolong arcing ....”


e com onent


contactshave beendesignedfor this type of application. Theyhave a ra


actuation. Forhighuse switching applications like


rvice life. rossbar


ratedlife of at least 5 Figure 1: Figure 1: switchhas


The Omron G5Q-EL is designed to reduce contact bounce and hence arcing


he Omron G5Q-EL is designed to reduce contact bounce and hence arcing


rcing andincreasing serv


re andshape for theG5Q-EL is rations at250VAC, 10A, rance of the


VA


relayunder the same conditions. ress bounce, rvice life.


rents inmotors, lamps,


inverters andother inductive or capacitive applications, it is sometimesnecessary ov


ry to


overspecify the relay just todealwiththe inrushcurre


circuitmay opera very


This canshort directly damage withit.By re AgSnIn,Omro


rvice life or ev even


rents. For example amotor or lamp rate at just 1A–butmay see a


rybrief inrushcurrent of40Aonswitchon. rtenthe serv


ge a relaynot designedto cope replacing theAgNi contactswith roncre


requiredwithout risk of rare reateda compact device for


circuits running at 1Athat couldnevertvertheless handle40Ainrushif re contactwelding.


Thoughbare


rely visible andrarely h


t


e o a


ov


m o o


n o


l to the cre vativenew ctro terc


rward sidera


s n e


ionof the contacts is e designand


reationof romechanical and


mponent solutions. rconnect


rw rdthinking


ntinue todevo anufacturers


rable re vote researc rch development effort to


of solutions fornew a, to create thenext


they emerge ge.


Home appliances, electric cookers, inverters, robots andindustrial systemshave ro


ke ve


reases is arcing–where the curre owacro


rent gapas the relay or owthiis is impact g endapplications


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