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.
Structure Operation
1. Forcedoperationmethod
(3FormA1FormBtypes)
Evenwhenonecontact isweldedclosed,theother
maintainsagapofgreaterthan0.
ds 61405 sf3: 180413D
.
If the No. Contact rating FileNo.01
6A250VAC
SAFETY STRUCTURE RELAYS
T t
s d
c e
w g
a s
( r
d ,
a l
i ,
s e
s ,
f e
a d
r f
e . 3FormA1FormBcontact Structurewithindependent COMcontact of(3FormA1FormB), contacts.
Eachofthethreeform“a”contacts(No. Contact rating
E43149 6A250VAC LR26550etc.
Independent COMenablesdifferingpolecircuit
configurations. Rating FileNo. Contact rating FileNo.5mm. contact welds.020inch.1 10197.
2.020inch.5mm.
576
Energized (whenno.
Subsequentcontact movementissuspendedandthe
weldcanbedetected
Thetwocontacts“a”and“b”arecoupledwiththesamecard.1 10376
99.SF3
SAFETY STANDARDS
UL/C-UL(Recognized) CSA(Certified) TÜV(Certified) SEV
FileNo. 1,2,and4)
maintainagapofgreaterthan0.
Inindependentchambers,thecontacts“a”and“b”arekeptapart byabody/
caseseparatororbythecarditself. Separatechambermethod
(3FormA1FormBtypes)
Preventsshortingandfusingofspringsandspring
failureowingtoshort-circuit current. Thismakesitpossibletodesign
variouskindsofcontrol circuitsandsafetycircuits.020inch.
F d
I a
m . 6A250VAC R9919003(SF3) 6A250VAC 97.
3. 3contact iswelded)
Becausetheweldedcontactspringisattachedtothe
card,thearmaturehasbecomeinoperative.
Inthediagramontheleft,thelowercontact “b”have
weldedbuttheuppercontact “a”maintainatagapof
greaterthan0.
Asshownonthediagramontheleft, evenifthe
operatingspringsnumbered 1and2thereisno
shortingbetween“a”and“b”contacts.Theoperation
ofeachcontact isregulatedbythemovementoftheothercontact.5mm
