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.
If the No. Contact rating
E43149 6A250VAC LR26550etc.
Structure Operation
1.
F d
I a
m .SF3
SAFETY STANDARDS
UL/C-UL(Recognized) CSA(Certified) TÜV(Certified) SEV
FileNo.
Asshownonthediagramontheleft, evenifthe
operatingspringsnumbered 1and2thereisno
shortingbetween“a”and“b”contacts. 1,2,and4)
maintainagapofgreaterthan0. Contact rating FileNo. Forcedoperationmethod
(3FormA1FormBtypes)
Evenwhenonecontact isweldedclosed,theother
maintainsagapofgreaterthan0.020inch. 3FormA1FormBcontact Structurewithindependent COMcontact of(3FormA1FormB), contacts. Contact rating FileNo.020inch.5mm.
Subsequentcontact movementissuspendedandthe
weldcanbedetected
Thetwocontacts“a”and“b”arecoupledwiththesamecard. 6A250VAC R9919003(SF3) 6A250VAC 97.1 10376
99.
2.Theoperation
ofeachcontact isregulatedbythemovementoftheothercontact.
Independent COMenablesdifferingpolecircuit
configurations.1 10197.020inch.
ds 61405 sf3: 180413D
.
576
Energized (whenno. 3contact iswelded)
Becausetheweldedcontactspringisattachedtothe
card,thearmaturehasbecomeinoperative.
Eachofthethreeform“a”contacts(No. Rating FileNo. Thismakesitpossibletodesign
variouskindsofcontrol circuitsandsafetycircuits. Separatechambermethod
(3FormA1FormBtypes)
Preventsshortingandfusingofspringsandspring
failureowingtoshort-circuit current.
3.01
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 .5mm.
Inindependentchambers,thecontacts“a”and“b”arekeptapart byabody/
caseseparatororbythecarditself.5mm.
Inthediagramontheleft,thelowercontact “b”have
weldedbuttheuppercontact “a”maintainatagapof
greaterthan0. contact welds
