57
CERAMIC SURGE ABSORBERS (VARISTORS)
SVC
APPLICATIONS
■ Telecommunication circuit protection
■ Switching circuit protection
■ Power supply circuit protection
Line circuit
AC/DC single-phase circuit
Line and groud circuit
AC three-phase circuit
AC/DC single-phase circuit
AC three-phase circuit
The protection of semiconducting elements such as diodes,
thyristors, transistors, IC and relays against transient voltages.
Similar protection of many types of measuring instruments,
control machinery and communication equipment and broadcasting
equipment against inductive lightning and switching surges.
Protection of general purpose electrical equipment, domestic
mechinery and appliances. TV and radios and similar consumer
products against lightning and switching surges.
Varistor voltage selection table (ZL)
Notes :
①The power supply voltage must not exceed the maximum
allowable circuit voltage.
②Since independent wiring loads and capacitive loads cause the
voltage build-up at the time of opening or closing the load, use SVC
having a varistor voltage as high as possible.( mark)
③The bold faced portions of the type letters vary.
Notes :
The varistor SVC has a capacitance value. Take not of this when
applying them to high-frequency signal circuits.
Protection of relay
(Contact coil)
Protection of
semiconductors
Notes :
①When subjected to megger testing (500V DC), the insulation
resistance value can decrease due to the leakage current of the
SVC, To avoid this remove the varistor or use marked SVC.
②When subjected to dielectric strength test(1000V AC). remove the
SVC or use
marked SVC.
Select varistors taking a note of operating conditions peculiar to the
equipment.
Notes :
①The power supply voltage must not exceed the maximum
allowable circuit voltage of the SVC
②Pay due attention to the surge energy generated by the load.
③Select SVC referring to the pulse lifetime rating.
④To further reduce the tendency of sparking across the contacts
connect a capacitor parallel with the SVC. This will also protect the
equipment from electromagnetic wave jamming.
Power supply voltage
Type
100V AC
SVC201D-□□A
SVC221D-□□A
SVC241D-□□A
SVC271D-□□A
200V AC
SVC391D-□□A
SVC431D-□□A
SVC471D-□□A
12V DC
SVC220D-□□B
24V DC
SVC390D-□□B
Varistor voltage selection guied
Power supply voltage
Type
12V DC
SVC180D-□□B
SVC220D-□□B
SVC820D-□□A
24V AC
SVC390D-□□B
SVC820D-□□A
Varistor voltage selection table (ZE)
Power supply voltage
Type
100V AC
SVC431D-□□A
200V AC
SVC471D-□□A
SVC751D-□□A to SVC 112D-□□A
SVC182D-□□A
Varistor voltage selection guide
Power supply voltage
Type
12V DC
SVC220D-□□B
24V DC
SVC390D-□□B
100V DC
SVC151D-□□A
100V AC
SVC201D-□□A
SVC221D-□□A
SVC241D-□□A
SVC271D-□□A
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