SVC821D-20A Просмотр технического описания (PDF) - Unspecified
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SVC821D-20A Datasheet PDF : 16 Pages
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CERAMIC SURGE ABSORBERS (VARISTORS)
SVC
Varistor Terminology
Varistor Voltage : Vnom
Varistor peak terminal voltage
measured with a specified current
applied
The DC current applied is 1mA
normally.
Rated transient energy : Wtm
Maximum allowable energy for a
single impulse of 2ms square-wave
current waveform with rated contin-
uous voltage applied. Maximum
energy rating base on a shift of
Vnom of less than ±10% of initial
value.
Tset current waveform
Characteristics tests for Varistors
are carried out by using 8/20㎲ test
impulses Data such as the
maximum clamping voltage(Vc)and
the transient peak current(ltm) are
obtained by using this impulse
current.
However, for the Vc characteristics
of the Axial package type a 10mA
DC squarewave current is used to
cary out the test.
Clamping voltage : Vc
Maximum terminal voltage (peak
voltage across the varistor)
measured with an applied 8/20㎲
impulse of a given peak current.
Pulse lifetime rating
This is expressed as the maximum
allowable number of impulse curr-
ents applied.
8/20㎲ impulse current (or 2ms sq-
uare wave) is applied at prescribed
interval.
This curve also provides for
derating current as required with
repetitive pulsing.
Rated RMS Voltage : Vacm
Maximum continuous sinusoidal
RMS voltage at 50/60Hz which
may be applied.
Rated DC Voltage : Vdcm
Maximum continuous DC voltage
which may be applied.
Capacitance
Typical values measured at a test
frequency of 1kHz
Rated peak transient current
: itm
Maximum peak current through the
varistor with line voltage applied.
The maximum peak current with in
the varistor voltage change ratio of
±10% with the standard 8/20㎲
impulse current applied two times
at 5 minute interval.
Rated average power dissipation
: Ptam
Maximum average power that can
be applied within the specified
ambient temperature.
60
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