SVC820D-20A Просмотр технического описания (PDF) - SAMWHA ELECTRIC

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SVC820D-20A

SVC Varistors Type

SAMWHA ELECTRIC 

Applications

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.

Power Supply Circuit Protection

Line circuit

Varistor voltage selection table (ZL)

Power Supply Voltage

100V AC

200V AC

12V DC

24V DC

Type

SVC201D -□□A

SVC221D -□□A

SVC241D -□□A

SVC271D -□□A*

SVC391D -□□A

SVC431D -□□A

SVC471D -□□A*

SVC220D -□□B

SVC390D -□□B

Line and groud circuit

Varistor voltage selection table(ZE)

Power Supply Voltage

100V AC

200V AC

Type

SVC431D -□□A

SVC471D -□□A

SVC751D -□□A to SVC112D -□□A*

SVC182D -□□A**

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.

AC/DC

single-phase circuit

AC

three-phase circuit

Telecommunication Circuit Protection

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

Varistor voltage selection guied

Power Supply Voltage

12V DC

24V AC

Type

SVC180D -□□B

SVC220D -□□B

SVC820D -□□A

SVC390D -□□B

SVC820D -□□A

Notes :

The varistor SVC has a capacitance value. Take not of this when

applying them to high-frequency signal circuits.

128 SAMWHA CAPACITOR Co., Ltd.

SVC Varistors Type

Switching Circuit Protection

Protection of relay

(Contact coil)

Protection of

semiconductors

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 a“t Ⅱ”position. Select fuse

rated current for the SVC referring to the following table.

SVC

Applicable fuse

rated current(A)

05A

05B

1 to 2

07A

07B

2 to 3

10A 14A 20A

10B 14B 20B

3 to 5 3 to 10 5 to 15

Varistor voltage selection guide

Power Supply Voltage

12V DC

24V DC

100V DC

100V AC

Type

SVC220D -□□B

SVC390D -□□B

SVC151D -□□A

SVC201D -□□A

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.

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

Application Notes

Overcurrent protection

When surges exceed the rating for the SVC, short-circuits or

damages can be expected. Take following precautions.

Electrical Characteristics

Operating ambient temperature

Storage temperature

Voltage temperatur coefficient

Insulation resistance(at500V)

-40℃ to +85℃

-40℃ to +125℃

-0.05% ℃

Over 1000MΩ

DISC Ceramic Capacitors 129

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