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of
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Figure 2.
Example of a “snubber” circuit
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
𝐶 =
𝐼
2
10
(1), and
𝑅 =
𝐸
10𝐼(1+
50
𝐸
)
(2),
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
Figure 2
shows a 1 A LOAD with a 110 V AC source connected in series with the Terranova® relay,
I
= 1 A and
E
= 110 V AC. Therefore,
Equation 1 provides a capacitance value of 0.1 µF; Equation 2 provides a resistance value of approximately 8
Ω.
Thus, a 0.1 µF
capacitor and a 10 Ω resistor
should be used
for the “snubber” circu
it. However, the voltage and power rating of the capacitor and
resistor, respectively, must be taken into consideration to meet circuit requirements. User should also consider similar protective
circuits or components 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
