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SVC330D-07B Datasheet(PDF) 8 Page - SAMWHA ELECTRIC

Part # SVC330D-07B
Description  SVC Varistors Type
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Manufacturer  SAMWHA [SAMWHA ELECTRIC]
Direct Link  http://www.samwha.com
Logo SAMWHA - SAMWHA ELECTRIC

SVC330D-07B Datasheet(HTML) 8 Page - SAMWHA ELECTRIC

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DISC Ceramic Capacitors 129
SAMWHA CAPACITOR Co., Ltd.
128
Applications
Power Supply Circuit Protection
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.
Line circuit
Varistor voltage selection table (ZL)
Power Supply Voltage
Type
SVC201D -□□A
100V AC
SVC221D -□□A
SVC241D -□□A
SVC271D -□□A*
SVC391D -□□A
200V AC
SVC431D -□□A
SVC471D -□□A*
12V DC
SVC220D -□□B
24V DC
SVC390D -□□B
Line and groud circuit
Varistor voltage selection table(ZE)
Power Supply Voltage
Type
100V AC
SVC431D -□□A
SVC471D -□□A
200V AC
SVC751D -□□A to SVC112D -□□A*
SVC182D -□□A**
Power Supply Voltage
Type
SVC180D -□□B
12V DC
SVC220D -□□B
SVC820D -□□A
24V AC
SVC390D -□□B
SVC820D -□□A
Notes :
① The power supply voltage must not exceed the maximum
allowable circuit voltage.
② Since 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)
③ The bold faced portions of the type letters vary.
AC/DC
single-phase circuit
AC
three-phase circuit
Notes :
① When 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.
② When 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 :
The varistor SVC has a capacitance value. Take not of this when
applying them to high-frequency signal circuits.
AC/DC
single-phase circuit
AC
three-phase circuit
Telecommunication Circuit Protection
Varistor voltage selection guied
Power Supply Voltage
Type
12V DC
SVC220D -□□B
24V DC
SVC390D -□□B
100V DC
SVC151D -□□A
SVC201D -□□A
100V AC
SVC221D -□□A
SVC241D -□□A
SVC271D -□□A
Notes :
① The power supply voltage must not exceed the maximum
allowable circuit voltage of the SVC
② Pay due attention to the surge energy generated by the
load.
③ Select SVC referring to the pulse lifetime rating.
④ To further reduce the tendency of sparking across the
contacts connect a capacitors parallel with the SVC. This will
also protect the equipment from electromagnetic wave
jamming.
① Connect the SVC at a position nearer to the equipment than
the overcurrent protection device“Ⅰ”(fuse, MCCB) as is
shown in the diagram.
When the SVC is shorted, the overcurrent protection device
“Ⅰ”operates (trips or blow off the fuse).
② If the overcurrent protection device“Ⅰ”can not be installed
in“Ⅰ”position, connect a fuse at“Ⅱ”position. Select fuse
rated current for the SVC referring to the following table.
③ When“Z2”SVC is connected between the equipment and
ground install an ELCB (Earth Leakage Circuit Breaker). If not
possible, connect a fuse or thermal fuse at“Ⅲ”position.
Installation
① When operated at location near heating element or
exposed to direct sun light, confirm that the ambient
temparature range.
② When operated in dusty or dirty locations, or exposed to
corrosive atomospheres, or where metallic powders or salt
can be expected, be sure to mount within a protective
enclosure.
Molding
When shielding the SVC in a resin molding, take a note of the
materials used and temperature, since they influence the
reliability. For further information please contact SAMWHA
Current, power and energy rating vs, temperature
Electrical Characteristics
Switching Circuit Protection
Application Notes
Overcurrent protection
Varistor voltage selection guide
Protection of relay
(Contact coil)
Protection of
semiconductors
When surges exceed the rating for the SVC, short-circuits or
damages can be expected. Take following precautions.
SVC
05A
07A
10A
14A
20A
05B
07B
10B
14B
20B
Applicable fuse
1 to 2
2 to 3
3 to 5
3 to 10
5 to 15
rated current(A)
Operating ambient temperature
-40℃ to +85℃
Storage temperature
-40℃ to +125℃
Voltage temperatur coefficient
-0.05% ℃
Insulation resistance(at500V)
Over 1000MΩ
SVC Varistors Type


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