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

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

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.

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