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.
Eachofthethreeform“a”contacts(No. Forcedoperationmethod
(3FormA1FormBtypes)
Evenwhenonecontact isweldedclosed,theother
maintainsagapofgreaterthan0.
Inthediagramontheleft,thelowercontact “b”have
weldedbuttheuppercontact “a”maintainatagapof
greaterthan0.
F d
I a
m .020inch.1 10376
99. contact welds. Contact rating
E43149 6A250VAC LR26550etc.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.
3.
Subsequentcontact movementissuspendedandthe
weldcanbedetected
Thetwocontacts“a”and“b”arecoupledwiththesamecard. 3FormA1FormBcontact Structurewithindependent COMcontact of(3FormA1FormB), contacts.020inch.
2.
Inindependentchambers,thecontacts“a”and“b”arekeptapart byabody/
caseseparatororbythecarditself.
576
Energized (whenno.SF3
SAFETY STANDARDS
UL/C-UL(Recognized) CSA(Certified) TÜV(Certified) SEV
FileNo. Rating FileNo. 1,2,and4)
maintainagapofgreaterthan0. Contact rating FileNo.Theoperation
ofeachcontact isregulatedbythemovementoftheothercontact.
Independent COMenablesdifferingpolecircuit
configurations. Thismakesitpossibletodesign
variouskindsofcontrol circuitsandsafetycircuits.
Asshownonthediagramontheleft, evenifthe
operatingspringsnumbered 1and2thereisno
shortingbetween“a”and“b”contacts.
Structure Operation
1. 3contact iswelded)
Becausetheweldedcontactspringisattachedtothe
card,thearmaturehasbecomeinoperative. Contact rating FileNo. 6A250VAC R9919003(SF3) 6A250VAC 97.5mm.5mm.020inch.1 10197. Separatechambermethod
(3FormA1FormBtypes)
Preventsshortingandfusingofspringsandspring
failureowingtoshort-circuit current.
ds 61405 sf3: 180413D
.
If the No
