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Page A-2
To calculate the appropriate capacitor
C
in microfarads [μF] and resistor
R
in ohms [Ω] to use
in the “snubber” circuit, Paktron Capacitors’ Quencharc® technical note
1
suggests the following
empirical equations
Figure II.
Example of “snubber” circuit
where
I
is the load current prior to contact opening in amperes [A] and
E
is the source voltage
in volts [V]. For example, if
shows a 0.1 A LOAD with a 110 V AC source connected in
series with the Terranova® relay,
I
= 0.1 A and
E
= 110 V AC. Therefore,
Equation 1
provides a
capacitance value of 0.001 μF;
Equation 2
provides a resistance value of approximately 76 Ω.
Thus, a 0.001 μF capacitor and a 100 Ω resistor should be used for the “snubber” circuit. However,
user must take into consideration the voltage and power rating of the capacitor and resistor,
respectively, to meet the requirements of the circuit. Similar protective circuits or components
should be considered to suppress current spikes in capacitive loads.
1. Pancon Corporation. ‘2012 Catalog’. 2012. 18-19. Web. http://www.panconcorp.com/PDFs/Catalogs/
Paktron_2012catalog.pdf
(1), and
(2),
